1 /* 2 * Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.lang.module; 27 28 import java.io.InputStream; 29 import java.io.IOException; 30 import java.io.PrintStream; 31 import java.io.UncheckedIOException; 32 import java.nio.ByteBuffer; 33 import java.nio.file.Path; 34 import java.util.ArrayList; 35 import java.util.Arrays; 36 import java.util.Collection; 37 import java.util.Collections; 38 import java.util.EnumSet; 39 import java.util.HashMap; 40 import java.util.HashSet; 41 import java.util.List; 42 import java.util.Locale; 43 import java.util.Map; 44 import java.util.Objects; 45 import java.util.Optional; 46 import java.util.Set; 47 import java.util.function.Supplier; 48 import java.util.stream.Collectors; 49 import java.util.stream.Stream; 50 51 import static jdk.internal.module.Checks.*; 52 import static java.util.Objects.*; 53 54 import jdk.internal.module.Checks; 55 import jdk.internal.module.ModuleInfo; 56 57 58 /** 59 * A module descriptor. 60 * 61 * <p> A module descriptor describes a named module and defines methods to 62 * obtain each of its components. The module descriptor for a named module 63 * in the Java virtual machine is obtained by invoking the {@link 64 * java.lang.Module Module}'s {@link java.lang.Module#getDescriptor 65 * getDescriptor} method. Module descriptors can also be created using the 66 * {@link ModuleDescriptor.Builder} class or by reading the binary form of a 67 * module declaration ({@code module-info.class}) using the {@link 68 * #read(InputStream,Supplier) read} methods defined here. </p> 69 * 70 * <p> A module descriptor describes a <em>normal</em>, open, or automatic 71 * module. <em>Normal</em> modules and open modules describe their {@link 72 * #requires() dependences}, {@link #exports() exported-packages}, the services 73 * that they {@link #uses() use} or {@link #provides() provide}, and other 74 * components. <em>Normal</em> modules may {@link #opens() open} specific 75 * packages. The module descriptor for an open modules does not declare any 76 * open packages (its {@code opens} method returns an empty set) but when 77 * instantiated in the Java virtual machine then it is treated as if all 78 * packages are open. The module descriptor for an automatic module does not 79 * declare any dependences (except for the mandatory dependency on {@code 80 * java.base}), and does not declare any exported or open packages. Automatic 81 * module receive special treatment during resolution so that they read all 82 * other modules in the configuration. When an automatic module is instantiated 83 * in the Java virtual machine then it reads every unnamed module and is 84 * treated as if all packages are exported and open. </p> 85 * 86 * <p> {@code ModuleDescriptor} objects are immutable and safe for use by 87 * multiple concurrent threads.</p> 88 * 89 * @see java.lang.Module 90 * @since 9 91 * @spec JPMS 92 */ 93 94 public class ModuleDescriptor 95 implements Comparable<ModuleDescriptor> 96 { 97 98 /** 99 * A modifier on a module. 100 * 101 * @see ModuleDescriptor#modifiers() 102 * @since 9 103 * @spec JPMS 104 */ 105 public enum Modifier { 106 /** 107 * An open module. An open module does not declare any open packages 108 * but the resulting module is treated as if all packages are open. 109 */ 110 OPEN, 111 112 /** 113 * An automatic module. An automatic module is treated as if it exports 114 * and opens all packages. 115 * 116 * @apiNote This modifier does not correspond to a module flag in the 117 * binary form of a module declaration ({@code module-info.class}). 118 */ 119 AUTOMATIC, 120 121 /** 122 * The module was not explicitly or implicitly declared. 123 */ 124 SYNTHETIC, 125 126 /** 127 * The module was implicitly declared. 128 */ 129 MANDATED; 130 } 131 132 133 /** 134 * <p> A dependence upon a module </p> 135 * 136 * @see ModuleDescriptor#requires() 137 * @since 9 138 * @spec JPMS 139 */ 140 141 public final static class Requires 142 implements Comparable<Requires> 143 { 144 145 /** 146 * A modifier on a module dependence. 147 * 148 * @see Requires#modifiers() 149 * @since 9 150 * @spec JPMS 151 */ 152 public enum Modifier { 153 154 /** 155 * The dependence causes any module which depends on the <i>current 156 * module</i> to have an implicitly declared dependence on the module 157 * named by the {@code Requires}. 158 */ 159 TRANSITIVE, 160 161 /** 162 * The dependence is mandatory in the static phase, during compilation, 163 * but is optional in the dynamic phase, during execution. 164 */ 165 STATIC, 166 167 /** 168 * The dependence was not explicitly or implicitly declared in the 169 * source of the module declaration. 170 */ 171 SYNTHETIC, 172 173 /** 174 * The dependence was implicitly declared in the source of the module 175 * declaration. 176 */ 177 MANDATED; 178 179 } 180 181 private final Set<Modifier> mods; 182 private final String name; 183 private final Version compiledVersion; 184 private final String rawCompiledVersion; 185 186 private Requires(Set<Modifier> ms, String mn, Version v, String vs) { 187 assert v == null || vs == null; 188 this.mods = Set.copyOf(ms); 189 this.name = mn; 190 this.compiledVersion = v; 191 this.rawCompiledVersion = vs; 192 } 193 194 private Requires(Set<Modifier> ms, String mn, Version v, boolean unused) { 195 this.mods = ms; 196 this.name = mn; 197 this.compiledVersion = v; 198 this.rawCompiledVersion = null; 199 } 200 201 /** 202 * Returns the set of modifiers. 203 * 204 * @return A possibly-empty unmodifiable set of modifiers 205 */ 206 public Set<Modifier> modifiers() { 207 return mods; 208 } 209 210 /** 211 * Return the module name. 212 * 213 * @return The module name 214 */ 215 public String name() { 216 return name; 217 } 218 219 /** 220 * Returns the version of the module if recorded at compile-time. 221 * 222 * @return The version of the module if recorded at compile-time, 223 * or an empty {@code Optional} if no version was recorded or 224 * the version string recorded is {@linkplain Version#parse(String) 225 * unparseable} 226 */ 227 public Optional<Version> compiledVersion() { 228 return Optional.ofNullable(compiledVersion); 229 } 230 231 /** 232 * Returns the string with the possibly-unparseable version of the module 233 * if recorded at compile-time. 234 * 235 * @return The string containing the version of the module if recorded 236 * at compile-time, or an empty {@code Optional} if no version 237 * was recorded 238 * 239 * @see #compiledVersion() 240 */ 241 public Optional<String> rawCompiledVersion() { 242 if (compiledVersion != null) { 243 return Optional.of(compiledVersion.toString()); 244 } else { 245 return Optional.ofNullable(rawCompiledVersion); 246 } 247 } 248 249 /** 250 * Compares this module dependence to another. 251 * 252 * <p> Two {@code Requires} objects are compared by comparing their 253 * module names lexicographically. Where the module names are equal 254 * then the sets of modifiers are compared in the same way that 255 * module modifiers are compared (see {@link ModuleDescriptor#compareTo 256 * ModuleDescriptor.compareTo}). Where the module names are equal and 257 * the set of modifiers are equal then the version of the modules 258 * recorded at compile-time are compared. When comparing the versions 259 * recorded at compile-time then a dependence that has a recorded 260 * version is considered to succeed a dependence that does not have a 261 * recorded version. If both recorded versions are {@linkplain 262 * Version#parse(String) unparseable} then the {@linkplain 263 * #rawCompiledVersion() raw version strings} are compared 264 * lexicographically. </p> 265 * 266 * @param that 267 * The module dependence to compare 268 * 269 * @return A negative integer, zero, or a positive integer if this module 270 * dependence is less than, equal to, or greater than the given 271 * module dependence 272 */ 273 @Override 274 public int compareTo(Requires that) { 275 if (this == that) return 0; 276 277 int c = this.name().compareTo(that.name()); 278 if (c != 0) return c; 279 280 // modifiers 281 long v1 = modsValue(this.modifiers()); 282 long v2 = modsValue(that.modifiers()); 283 c = Long.compare(v1, v2); 284 if (c != 0) return c; 285 286 // compiledVersion 287 c = compare(this.compiledVersion, that.compiledVersion); 288 if (c != 0) return c; 289 290 // rawCompiledVersion 291 c = compare(this.rawCompiledVersion, that.rawCompiledVersion); 292 if (c != 0) return c; 293 294 return 0; 295 } 296 297 /** 298 * Tests this module dependence for equality with the given object. 299 * 300 * <p> If the given object is not a {@code Requires} then this method 301 * returns {@code false}. Two module dependence objects are equal if 302 * the module names are equal, set of modifiers are equal, and the 303 * compiled version of both modules is equal or not recorded for 304 * both modules. </p> 305 * 306 * <p> This method satisfies the general contract of the {@link 307 * java.lang.Object#equals(Object) Object.equals} method. </p> 308 * 309 * @param ob 310 * the object to which this object is to be compared 311 * 312 * @return {@code true} if, and only if, the given object is a module 313 * dependence that is equal to this module dependence 314 */ 315 @Override 316 public boolean equals(Object ob) { 317 if (!(ob instanceof Requires)) 318 return false; 319 Requires that = (Requires)ob; 320 return name.equals(that.name) && mods.equals(that.mods) 321 && Objects.equals(compiledVersion, that.compiledVersion) 322 && Objects.equals(rawCompiledVersion, that.rawCompiledVersion); 323 } 324 325 /** 326 * Computes a hash code for this module dependence. 327 * 328 * <p> The hash code is based upon the module name, modifiers, and the 329 * module version if recorded at compile time. It satisfies the general 330 * contract of the {@link Object#hashCode Object.hashCode} method. </p> 331 * 332 * @return The hash-code value for this module dependence 333 */ 334 @Override 335 public int hashCode() { 336 int hash = name.hashCode() * 43 + mods.hashCode(); 337 if (compiledVersion != null) 338 hash = hash * 43 + compiledVersion.hashCode(); 339 if (rawCompiledVersion != null) 340 hash = hash * 43 + rawCompiledVersion.hashCode(); 341 return hash; 342 } 343 344 /** 345 * Returns a string describing this module dependence. 346 * 347 * @return A string describing this module dependence 348 */ 349 @Override 350 public String toString() { 351 String what; 352 if (compiledVersion != null) { 353 what = name() + " (@" + compiledVersion + ")"; 354 } else { 355 what = name(); 356 } 357 return ModuleDescriptor.toString(mods, what); 358 } 359 } 360 361 362 363 /** 364 * <p> A package exported by a module, may be qualified or unqualified. </p> 365 * 366 * @see ModuleDescriptor#exports() 367 * @since 9 368 * @spec JPMS 369 */ 370 371 public final static class Exports 372 implements Comparable<Exports> 373 { 374 375 /** 376 * A modifier on an exported package. 377 * 378 * @see Exports#modifiers() 379 * @since 9 380 * @spec JPMS 381 */ 382 public enum Modifier { 383 384 /** 385 * The export was not explicitly or implicitly declared in the 386 * source of the module declaration. 387 */ 388 SYNTHETIC, 389 390 /** 391 * The export was implicitly declared in the source of the module 392 * declaration. 393 */ 394 MANDATED; 395 396 } 397 398 private final Set<Modifier> mods; 399 private final String source; 400 private final Set<String> targets; // empty if unqualified export 401 402 /** 403 * Constructs an export 404 */ 405 private Exports(Set<Modifier> ms, String source, Set<String> targets) { 406 this.mods = Set.copyOf(ms); 407 this.source = source; 408 this.targets = Set.copyOf(targets); 409 } 410 411 private Exports(Set<Modifier> ms, 412 String source, 413 Set<String> targets, 414 boolean unused) { 415 this.mods = ms; 416 this.source = source; 417 this.targets = targets; 418 } 419 420 /** 421 * Returns the set of modifiers. 422 * 423 * @return A possibly-empty unmodifiable set of modifiers 424 */ 425 public Set<Modifier> modifiers() { 426 return mods; 427 } 428 429 /** 430 * Returns {@code true} if this is a qualified export. 431 * 432 * @return {@code true} if this is a qualified export 433 */ 434 public boolean isQualified() { 435 return !targets.isEmpty(); 436 } 437 438 /** 439 * Returns the package name. 440 * 441 * @return The package name 442 */ 443 public String source() { 444 return source; 445 } 446 447 /** 448 * For a qualified export, returns the non-empty and immutable set 449 * of the module names to which the package is exported. For an 450 * unqualified export, returns an empty set. 451 * 452 * @return The set of target module names or for an unqualified 453 * export, an empty set 454 */ 455 public Set<String> targets() { 456 return targets; 457 } 458 459 /** 460 * Compares this module export to another. 461 * 462 * <p> Two {@code Exports} objects are compared by comparing the package 463 * names lexicographically. Where the packages names are equal then the 464 * sets of modifiers are compared in the same way that module modifiers 465 * are compared (see {@link ModuleDescriptor#compareTo 466 * ModuleDescriptor.compareTo}). Where the package names are equal and 467 * the set of modifiers are equal then the set of target modules are 468 * compared. This is done by sorting the names of the target modules 469 * in ascending order, and according to their natural ordering, and then 470 * comparing the corresponding elements lexicographically. Where the 471 * sets differ in size, and the larger set contains all elements of the 472 * smaller set, then the larger set is considered to succeed the smaller 473 * set. </p> 474 * 475 * @param that 476 * The module export to compare 477 * 478 * @return A negative integer, zero, or a positive integer if this module 479 * export is less than, equal to, or greater than the given 480 * export dependence 481 */ 482 @Override 483 public int compareTo(Exports that) { 484 if (this == that) return 0; 485 486 int c = source.compareTo(that.source); 487 if (c != 0) 488 return c; 489 490 // modifiers 491 long v1 = modsValue(this.modifiers()); 492 long v2 = modsValue(that.modifiers()); 493 c = Long.compare(v1, v2); 494 if (c != 0) 495 return c; 496 497 // targets 498 c = compare(targets, that.targets); 499 if (c != 0) 500 return c; 501 502 return 0; 503 } 504 505 /** 506 * Computes a hash code for this module export. 507 * 508 * <p> The hash code is based upon the modifiers, the package name, 509 * and for a qualified export, the set of modules names to which the 510 * package is exported. It satisfies the general contract of the 511 * {@link Object#hashCode Object.hashCode} method. 512 * 513 * @return The hash-code value for this module export 514 */ 515 @Override 516 public int hashCode() { 517 int hash = mods.hashCode(); 518 hash = hash * 43 + source.hashCode(); 519 return hash * 43 + targets.hashCode(); 520 } 521 522 /** 523 * Tests this module export for equality with the given object. 524 * 525 * <p> If the given object is not an {@code Exports} then this method 526 * returns {@code false}. Two module exports objects are equal if their 527 * set of modifiers is equal, the package names are equal and the set 528 * of target module names is equal. </p> 529 * 530 * <p> This method satisfies the general contract of the {@link 531 * java.lang.Object#equals(Object) Object.equals} method. </p> 532 * 533 * @param ob 534 * the object to which this object is to be compared 535 * 536 * @return {@code true} if, and only if, the given object is a module 537 * dependence that is equal to this module dependence 538 */ 539 @Override 540 public boolean equals(Object ob) { 541 if (!(ob instanceof Exports)) 542 return false; 543 Exports other = (Exports)ob; 544 return Objects.equals(this.mods, other.mods) 545 && Objects.equals(this.source, other.source) 546 && Objects.equals(this.targets, other.targets); 547 } 548 549 /** 550 * Returns a string describing the exported package. 551 * 552 * @return A string describing the exported package 553 */ 554 @Override 555 public String toString() { 556 String s = ModuleDescriptor.toString(mods, source); 557 if (targets.isEmpty()) 558 return s; 559 else 560 return s + " to " + targets; 561 } 562 } 563 564 565 /** 566 * <p> A package opened by a module, may be qualified or unqualified. </p> 567 * 568 * <p> The <em>opens</em> directive in a module declaration declares a 569 * package to be open to allow all types in the package, and all their 570 * members, not just public types and their public members to be reflected 571 * on by APIs that support private access or a way to bypass or suppress 572 * default Java language access control checks. </p> 573 * 574 * @see ModuleDescriptor#opens() 575 * @since 9 576 * @spec JPMS 577 */ 578 579 public final static class Opens 580 implements Comparable<Opens> 581 { 582 /** 583 * A modifier on an open package. 584 * 585 * @see Opens#modifiers() 586 * @since 9 587 * @spec JPMS 588 */ 589 public enum Modifier { 590 591 /** 592 * The open package was not explicitly or implicitly declared in 593 * the source of the module declaration. 594 */ 595 SYNTHETIC, 596 597 /** 598 * The open package was implicitly declared in the source of the 599 * module declaration. 600 */ 601 MANDATED; 602 603 } 604 605 private final Set<Modifier> mods; 606 private final String source; 607 private final Set<String> targets; // empty if unqualified export 608 609 /** 610 * Constructs an Opens 611 */ 612 private Opens(Set<Modifier> ms, String source, Set<String> targets) { 613 this.mods = Set.copyOf(ms); 614 this.source = source; 615 this.targets = Set.copyOf(targets); 616 } 617 618 private Opens(Set<Modifier> ms, 619 String source, 620 Set<String> targets, 621 boolean unused) { 622 this.mods = ms; 623 this.source = source; 624 this.targets = targets; 625 } 626 627 /** 628 * Returns the set of modifiers. 629 * 630 * @return A possibly-empty unmodifiable set of modifiers 631 */ 632 public Set<Modifier> modifiers() { 633 return mods; 634 } 635 636 /** 637 * Returns {@code true} if this is a qualified opens. 638 * 639 * @return {@code true} if this is a qualified opens 640 */ 641 public boolean isQualified() { 642 return !targets.isEmpty(); 643 } 644 645 /** 646 * Returns the package name. 647 * 648 * @return The package name 649 */ 650 public String source() { 651 return source; 652 } 653 654 /** 655 * For a qualified opens, returns the non-empty and immutable set 656 * of the module names to which the package is open. For an 657 * unqualified opens, returns an empty set. 658 * 659 * @return The set of target module names or for an unqualified 660 * opens, an empty set 661 */ 662 public Set<String> targets() { 663 return targets; 664 } 665 666 /** 667 * Compares this module opens to another. 668 * 669 * <p> Two {@code Opens} objects are compared by comparing the package 670 * names lexicographically. Where the packages names are equal then the 671 * sets of modifiers are compared in the same way that module modifiers 672 * are compared (see {@link ModuleDescriptor#compareTo 673 * ModuleDescriptor.compareTo}). Where the package names are equal and 674 * the set of modifiers are equal then the set of target modules are 675 * compared. This is done by sorting the names of the target modules 676 * in ascending order, and according to their natural ordering, and then 677 * comparing the corresponding elements lexicographically. Where the 678 * sets differ in size, and the larger set contains all elements of the 679 * smaller set, then the larger set is considered to succeed the smaller 680 * set. </p> 681 * 682 * @param that 683 * The module opens to compare 684 * 685 * @return A negative integer, zero, or a positive integer if this module 686 * opens is less than, equal to, or greater than the given 687 * module opens 688 */ 689 @Override 690 public int compareTo(Opens that) { 691 if (this == that) return 0; 692 693 int c = source.compareTo(that.source); 694 if (c != 0) 695 return c; 696 697 // modifiers 698 long v1 = modsValue(this.modifiers()); 699 long v2 = modsValue(that.modifiers()); 700 c = Long.compare(v1, v2); 701 if (c != 0) 702 return c; 703 704 // targets 705 c = compare(targets, that.targets); 706 if (c != 0) 707 return c; 708 709 return 0; 710 } 711 712 /** 713 * Computes a hash code for this module opens. 714 * 715 * <p> The hash code is based upon the modifiers, the package name, 716 * and for a qualified opens, the set of modules names to which the 717 * package is opened. It satisfies the general contract of the 718 * {@link Object#hashCode Object.hashCode} method. 719 * 720 * @return The hash-code value for this module opens 721 */ 722 @Override 723 public int hashCode() { 724 int hash = mods.hashCode(); 725 hash = hash * 43 + source.hashCode(); 726 return hash * 43 + targets.hashCode(); 727 } 728 729 /** 730 * Tests this module opens for equality with the given object. 731 * 732 * <p> If the given object is not an {@code Opens} then this method 733 * returns {@code false}. Two {@code Opens} objects are equal if their 734 * set of modifiers is equal, the package names are equal and the set 735 * of target module names is equal. </p> 736 * 737 * <p> This method satisfies the general contract of the {@link 738 * java.lang.Object#equals(Object) Object.equals} method. </p> 739 * 740 * @param ob 741 * the object to which this object is to be compared 742 * 743 * @return {@code true} if, and only if, the given object is a module 744 * dependence that is equal to this module dependence 745 */ 746 @Override 747 public boolean equals(Object ob) { 748 if (!(ob instanceof Opens)) 749 return false; 750 Opens other = (Opens)ob; 751 return Objects.equals(this.mods, other.mods) 752 && Objects.equals(this.source, other.source) 753 && Objects.equals(this.targets, other.targets); 754 } 755 756 /** 757 * Returns a string describing the open package. 758 * 759 * @return A string describing the open package 760 */ 761 @Override 762 public String toString() { 763 String s = ModuleDescriptor.toString(mods, source); 764 if (targets.isEmpty()) 765 return s; 766 else 767 return s + " to " + targets; 768 } 769 } 770 771 772 /** 773 * <p> A service that a module provides one or more implementations of. </p> 774 * 775 * @see ModuleDescriptor#provides() 776 * @since 9 777 * @spec JPMS 778 */ 779 780 public final static class Provides 781 implements Comparable<Provides> 782 { 783 private final String service; 784 private final List<String> providers; 785 786 private Provides(String service, List<String> providers) { 787 this.service = service; 788 this.providers = List.copyOf(providers); 789 } 790 791 private Provides(String service, List<String> providers, boolean unused) { 792 this.service = service; 793 this.providers = providers; 794 } 795 796 /** 797 * Returns the fully qualified class name of the service type. 798 * 799 * @return The fully qualified class name of the service type 800 */ 801 public String service() { return service; } 802 803 /** 804 * Returns the list of the fully qualified class names of the providers 805 * or provider factories. 806 * 807 * @return A non-empty and unmodifiable list of the fully qualified class 808 * names of the providers or provider factories 809 */ 810 public List<String> providers() { return providers; } 811 812 /** 813 * Compares this provides to another. 814 * 815 * <p> Two {@code Provides} objects are compared by comparing the fully 816 * qualified class name of the service type lexicographically. Where the 817 * class names are equal then the list of the provider class names are 818 * compared by comparing the corresponding elements of both lists 819 * lexicographically and in sequence. Where the lists differ in size, 820 * {@code N} is the size of the shorter list, and the first {@code N} 821 * corresponding elements are equal, then the longer list is considered 822 * to succeed the shorter list. </p> 823 * 824 * @param that 825 * The {@code Provides} to compare 826 * 827 * @return A negative integer, zero, or a positive integer if this provides 828 * is less than, equal to, or greater than the given provides 829 */ 830 public int compareTo(Provides that) { 831 if (this == that) return 0; 832 833 int c = service.compareTo(that.service); 834 if (c != 0) return c; 835 836 // compare provider class names in sequence 837 int size1 = this.providers.size(); 838 int size2 = that.providers.size(); 839 for (int index=0; index<Math.min(size1, size2); index++) { 840 String e1 = this.providers.get(index); 841 String e2 = that.providers.get(index); 842 c = e1.compareTo(e2); 843 if (c != 0) return c; 844 } 845 if (size1 == size2) { 846 return 0; 847 } else { 848 return (size1 > size2) ? 1 : -1; 849 } 850 } 851 852 /** 853 * Computes a hash code for this provides. 854 * 855 * <p> The hash code is based upon the service type and the set of 856 * providers. It satisfies the general contract of the {@link 857 * Object#hashCode Object.hashCode} method. </p> 858 * 859 * @return The hash-code value for this module provides 860 */ 861 @Override 862 public int hashCode() { 863 return service.hashCode() * 43 + providers.hashCode(); 864 } 865 866 /** 867 * Tests this provides for equality with the given object. 868 * 869 * <p> If the given object is not a {@code Provides} then this method 870 * returns {@code false}. Two {@code Provides} objects are equal if the 871 * service type is equal and the list of providers is equal. </p> 872 * 873 * <p> This method satisfies the general contract of the {@link 874 * java.lang.Object#equals(Object) Object.equals} method. </p> 875 * 876 * @param ob 877 * the object to which this object is to be compared 878 * 879 * @return {@code true} if, and only if, the given object is a 880 * {@code Provides} that is equal to this {@code Provides} 881 */ 882 @Override 883 public boolean equals(Object ob) { 884 if (!(ob instanceof Provides)) 885 return false; 886 Provides other = (Provides)ob; 887 return Objects.equals(this.service, other.service) && 888 Objects.equals(this.providers, other.providers); 889 } 890 891 /** 892 * Returns a string describing this provides. 893 * 894 * @return A string describing this provides 895 */ 896 @Override 897 public String toString() { 898 return service + " with " + providers; 899 } 900 901 } 902 903 904 905 /** 906 * A module's version string. 907 * 908 * <p> A version string has three components: The version number itself, an 909 * optional pre-release version, and an optional build version. Each 910 * component is a sequence of tokens; each token is either a non-negative 911 * integer or a string. Tokens are separated by the punctuation characters 912 * {@code '.'}, {@code '-'}, or {@code '+'}, or by transitions from a 913 * sequence of digits to a sequence of characters that are neither digits 914 * nor punctuation characters, or vice versa. 915 * 916 * <ul> 917 * 918 * <li> The <i>version number</i> is a sequence of tokens separated by 919 * {@code '.'} characters, terminated by the first {@code '-'} or {@code 920 * '+'} character. </li> 921 * 922 * <li> The <i>pre-release version</i> is a sequence of tokens separated 923 * by {@code '.'} or {@code '-'} characters, terminated by the first 924 * {@code '+'} character. </li> 925 * 926 * <li> The <i>build version</i> is a sequence of tokens separated by 927 * {@code '.'}, {@code '-'}, or {@code '+'} characters. 928 * 929 * </ul> 930 * 931 * <p> When comparing two version strings, the elements of their 932 * corresponding components are compared in pointwise fashion. If one 933 * component is longer than the other, but otherwise equal to it, then the 934 * first component is considered the greater of the two; otherwise, if two 935 * corresponding elements are integers then they are compared as such; 936 * otherwise, at least one of the elements is a string, so the other is 937 * converted into a string if it is an integer and the two are compared 938 * lexicographically. Trailing integer elements with the value zero are 939 * ignored. 940 * 941 * <p> Given two version strings, if their version numbers differ then the 942 * result of comparing them is the result of comparing their version 943 * numbers; otherwise, if one of them has a pre-release version but the 944 * other does not then the first is considered to precede the second, 945 * otherwise the result of comparing them is the result of comparing their 946 * pre-release versions; otherwise, the result of comparing them is the 947 * result of comparing their build versions. 948 * 949 * @see ModuleDescriptor#version() 950 * @since 9 951 * @spec JPMS 952 */ 953 954 public final static class Version 955 implements Comparable<Version> 956 { 957 958 private final String version; 959 960 // If Java had disjunctive types then we'd write List<Integer|String> here 961 // 962 private final List<Object> sequence; 963 private final List<Object> pre; 964 private final List<Object> build; 965 966 // Take a numeric token starting at position i 967 // Append it to the given list 968 // Return the index of the first character not taken 969 // Requires: s.charAt(i) is (decimal) numeric 970 // 971 private static int takeNumber(String s, int i, List<Object> acc) { 972 char c = s.charAt(i); 973 int d = (c - '0'); 974 int n = s.length(); 975 while (++i < n) { 976 c = s.charAt(i); 977 if (c >= '0' && c <= '9') { 978 d = d * 10 + (c - '0'); 979 continue; 980 } 981 break; 982 } 983 acc.add(d); 984 return i; 985 } 986 987 // Take a string token starting at position i 988 // Append it to the given list 989 // Return the index of the first character not taken 990 // Requires: s.charAt(i) is not '.' 991 // 992 private static int takeString(String s, int i, List<Object> acc) { 993 int b = i; 994 int n = s.length(); 995 while (++i < n) { 996 char c = s.charAt(i); 997 if (c != '.' && c != '-' && c != '+' && !(c >= '0' && c <= '9')) 998 continue; 999 break; 1000 } 1001 acc.add(s.substring(b, i)); 1002 return i; 1003 } 1004 1005 // Syntax: tok+ ( '-' tok+)? ( '+' tok+)? 1006 // First token string is sequence, second is pre, third is build 1007 // Tokens are separated by '.' or '-', or by changes between alpha & numeric 1008 // Numeric tokens are compared as decimal integers 1009 // Non-numeric tokens are compared lexicographically 1010 // A version with a non-empty pre is less than a version with same seq but no pre 1011 // Tokens in build may contain '-' and '+' 1012 // 1013 private Version(String v) { 1014 1015 if (v == null) 1016 throw new IllegalArgumentException("Null version string"); 1017 int n = v.length(); 1018 if (n == 0) 1019 throw new IllegalArgumentException("Empty version string"); 1020 1021 int i = 0; 1022 char c = v.charAt(i); 1023 if (!(c >= '0' && c <= '9')) 1024 throw new IllegalArgumentException(v 1025 + ": Version string does not start" 1026 + " with a number"); 1027 1028 List<Object> sequence = new ArrayList<>(4); 1029 List<Object> pre = new ArrayList<>(2); 1030 List<Object> build = new ArrayList<>(2); 1031 1032 i = takeNumber(v, i, sequence); 1033 1034 while (i < n) { 1035 c = v.charAt(i); 1036 if (c == '.') { 1037 i++; 1038 continue; 1039 } 1040 if (c == '-' || c == '+') { 1041 i++; 1042 break; 1043 } 1044 if (c >= '0' && c <= '9') 1045 i = takeNumber(v, i, sequence); 1046 else 1047 i = takeString(v, i, sequence); 1048 } 1049 1050 if (c == '-' && i >= n) 1051 throw new IllegalArgumentException(v + ": Empty pre-release"); 1052 1053 while (i < n) { 1054 c = v.charAt(i); 1055 if (c >= '0' && c <= '9') 1056 i = takeNumber(v, i, pre); 1057 else 1058 i = takeString(v, i, pre); 1059 if (i >= n) 1060 break; 1061 c = v.charAt(i); 1062 if (c == '.' || c == '-') { 1063 i++; 1064 continue; 1065 } 1066 if (c == '+') { 1067 i++; 1068 break; 1069 } 1070 } 1071 1072 if (c == '+' && i >= n) 1073 throw new IllegalArgumentException(v + ": Empty pre-release"); 1074 1075 while (i < n) { 1076 c = v.charAt(i); 1077 if (c >= '0' && c <= '9') 1078 i = takeNumber(v, i, build); 1079 else 1080 i = takeString(v, i, build); 1081 if (i >= n) 1082 break; 1083 c = v.charAt(i); 1084 if (c == '.' || c == '-' || c == '+') { 1085 i++; 1086 continue; 1087 } 1088 } 1089 1090 this.version = v; 1091 this.sequence = sequence; 1092 this.pre = pre; 1093 this.build = build; 1094 } 1095 1096 /** 1097 * Parses the given string as a version string. 1098 * 1099 * @param v 1100 * The string to parse 1101 * 1102 * @return The resulting {@code Version} 1103 * 1104 * @throws IllegalArgumentException 1105 * If {@code v} is {@code null}, an empty string, or cannot be 1106 * parsed as a version string 1107 */ 1108 public static Version parse(String v) { 1109 return new Version(v); 1110 } 1111 1112 @SuppressWarnings("unchecked") 1113 private int cmp(Object o1, Object o2) { 1114 return ((Comparable)o1).compareTo(o2); 1115 } 1116 1117 private int compareTokens(List<Object> ts1, List<Object> ts2) { 1118 int n = Math.min(ts1.size(), ts2.size()); 1119 for (int i = 0; i < n; i++) { 1120 Object o1 = ts1.get(i); 1121 Object o2 = ts2.get(i); 1122 if ((o1 instanceof Integer && o2 instanceof Integer) 1123 || (o1 instanceof String && o2 instanceof String)) 1124 { 1125 int c = cmp(o1, o2); 1126 if (c == 0) 1127 continue; 1128 return c; 1129 } 1130 // Types differ, so convert number to string form 1131 int c = o1.toString().compareTo(o2.toString()); 1132 if (c == 0) 1133 continue; 1134 return c; 1135 } 1136 List<Object> rest = ts1.size() > ts2.size() ? ts1 : ts2; 1137 int e = rest.size(); 1138 for (int i = n; i < e; i++) { 1139 Object o = rest.get(i); 1140 if (o instanceof Integer && ((Integer)o) == 0) 1141 continue; 1142 return ts1.size() - ts2.size(); 1143 } 1144 return 0; 1145 } 1146 1147 /** 1148 * Compares this module version to another module version. Module 1149 * versions are compared as described in the class description. 1150 * 1151 * @param that 1152 * The module version to compare 1153 * 1154 * @return A negative integer, zero, or a positive integer as this 1155 * module version is less than, equal to, or greater than the 1156 * given module version 1157 */ 1158 @Override 1159 public int compareTo(Version that) { 1160 int c = compareTokens(this.sequence, that.sequence); 1161 if (c != 0) return c; 1162 if (this.pre.isEmpty()) { 1163 if (!that.pre.isEmpty()) return +1; 1164 } else { 1165 if (that.pre.isEmpty()) return -1; 1166 } 1167 c = compareTokens(this.pre, that.pre); 1168 if (c != 0) return c; 1169 return compareTokens(this.build, that.build); 1170 } 1171 1172 /** 1173 * Tests this module version for equality with the given object. 1174 * 1175 * <p> If the given object is not a {@code Version} then this method 1176 * returns {@code false}. Two module version are equal if their 1177 * corresponding components are equal. </p> 1178 * 1179 * <p> This method satisfies the general contract of the {@link 1180 * java.lang.Object#equals(Object) Object.equals} method. </p> 1181 * 1182 * @param ob 1183 * the object to which this object is to be compared 1184 * 1185 * @return {@code true} if, and only if, the given object is a module 1186 * reference that is equal to this module reference 1187 */ 1188 @Override 1189 public boolean equals(Object ob) { 1190 if (!(ob instanceof Version)) 1191 return false; 1192 return compareTo((Version)ob) == 0; 1193 } 1194 1195 /** 1196 * Computes a hash code for this module version. 1197 * 1198 * <p> The hash code is based upon the components of the version and 1199 * satisfies the general contract of the {@link Object#hashCode 1200 * Object.hashCode} method. </p> 1201 * 1202 * @return The hash-code value for this module version 1203 */ 1204 @Override 1205 public int hashCode() { 1206 return version.hashCode(); 1207 } 1208 1209 /** 1210 * Returns the string from which this version was parsed. 1211 * 1212 * @return The string from which this version was parsed. 1213 */ 1214 @Override 1215 public String toString() { 1216 return version; 1217 } 1218 1219 } 1220 1221 1222 private final String name; 1223 private final Version version; 1224 private final String rawVersionString; 1225 private final Set<Modifier> modifiers; 1226 private final boolean open; // true if modifiers contains OPEN 1227 private final boolean automatic; // true if modifiers contains AUTOMATIC 1228 private final Set<Requires> requires; 1229 private final Set<Exports> exports; 1230 private final Set<Opens> opens; 1231 private final Set<String> uses; 1232 private final Set<Provides> provides; 1233 private final Set<String> packages; 1234 private final String mainClass; 1235 1236 private ModuleDescriptor(String name, 1237 Version version, 1238 String rawVersionString, 1239 Set<Modifier> modifiers, 1240 Set<Requires> requires, 1241 Set<Exports> exports, 1242 Set<Opens> opens, 1243 Set<String> uses, 1244 Set<Provides> provides, 1245 Set<String> packages, 1246 String mainClass) 1247 { 1248 assert version == null || rawVersionString == null; 1249 this.name = name; 1250 this.version = version; 1251 this.rawVersionString = rawVersionString; 1252 this.modifiers = Set.copyOf(modifiers); 1253 this.open = modifiers.contains(Modifier.OPEN); 1254 this.automatic = modifiers.contains(Modifier.AUTOMATIC); 1255 assert (requires.stream().map(Requires::name).distinct().count() 1256 == requires.size()); 1257 this.requires = Set.copyOf(requires); 1258 this.exports = Set.copyOf(exports); 1259 this.opens = Set.copyOf(opens); 1260 this.uses = Set.copyOf(uses); 1261 this.provides = Set.copyOf(provides); 1262 1263 this.packages = Set.copyOf(packages); 1264 this.mainClass = mainClass; 1265 } 1266 1267 /** 1268 * Creates a module descriptor from its components. 1269 * The arguments are pre-validated and sets are unmodifiable sets. 1270 */ 1271 ModuleDescriptor(String name, 1272 Version version, 1273 Set<Modifier> modifiers, 1274 Set<Requires> requires, 1275 Set<Exports> exports, 1276 Set<Opens> opens, 1277 Set<String> uses, 1278 Set<Provides> provides, 1279 Set<String> packages, 1280 String mainClass, 1281 int hashCode, 1282 boolean unused) { 1283 this.name = name; 1284 this.version = version; 1285 this.rawVersionString = null; 1286 this.modifiers = modifiers; 1287 this.open = modifiers.contains(Modifier.OPEN); 1288 this.automatic = modifiers.contains(Modifier.AUTOMATIC); 1289 this.requires = requires; 1290 this.exports = exports; 1291 this.opens = opens; 1292 this.uses = uses; 1293 this.provides = provides; 1294 this.packages = packages; 1295 this.mainClass = mainClass; 1296 this.hash = hashCode; 1297 } 1298 1299 /** 1300 * <p> Returns the module name. </p> 1301 * 1302 * @return The module name 1303 */ 1304 public String name() { 1305 return name; 1306 } 1307 1308 /** 1309 * <p> Returns the set of module modifiers. </p> 1310 * 1311 * @return A possibly-empty unmodifiable set of modifiers 1312 */ 1313 public Set<Modifier> modifiers() { 1314 return modifiers; 1315 } 1316 1317 /** 1318 * <p> Returns {@code true} if this is an open module. </p> 1319 * 1320 * <p> This method is equivalent to testing if the set of {@link #modifiers() 1321 * modifiers} contains the {@link Modifier#OPEN OPEN} modifier. </p> 1322 * 1323 * @return {@code true} if this is an open module 1324 */ 1325 public boolean isOpen() { 1326 return open; 1327 } 1328 1329 /** 1330 * <p> Returns {@code true} if this is an automatic module. </p> 1331 * 1332 * <p> This method is equivalent to testing if the set of {@link #modifiers() 1333 * modifiers} contains the {@link Modifier#OPEN AUTOMATIC} modifier. </p> 1334 * 1335 * @return {@code true} if this is an automatic module 1336 */ 1337 public boolean isAutomatic() { 1338 return automatic; 1339 } 1340 1341 /** 1342 * <p> Returns the set of {@code Requires} objects representing the module 1343 * dependences. </p> 1344 * 1345 * <p> The set includes a dependency on "{@code java.base}" when this 1346 * module is not named "{@code java.base}". If this module is an automatic 1347 * module then it does not have a dependency on any module other than 1348 * "{@code java.base}". </p> 1349 * 1350 * @return A possibly-empty unmodifiable set of {@link Requires} objects 1351 */ 1352 public Set<Requires> requires() { 1353 return requires; 1354 } 1355 1356 /** 1357 * <p> Returns the set of {@code Exports} objects representing the exported 1358 * packages. </p> 1359 * 1360 * <p> If this module is an automatic module then the set of exports 1361 * is empty. </p> 1362 * 1363 * @return A possibly-empty unmodifiable set of exported packages 1364 */ 1365 public Set<Exports> exports() { 1366 return exports; 1367 } 1368 1369 /** 1370 * <p> Returns the set of {@code Opens} objects representing the open 1371 * packages. </p> 1372 * 1373 * <p> If this module is an open module or an automatic module then the 1374 * set of open packages is empty. </p> 1375 * 1376 * @return A possibly-empty unmodifiable set of open packages 1377 */ 1378 public Set<Opens> opens() { 1379 return opens; 1380 } 1381 1382 /** 1383 * <p> Returns the set of service dependences. </p> 1384 * 1385 * <p> If this module is an automatic module then the set of service 1386 * dependences is empty. </p> 1387 * 1388 * @return A possibly-empty unmodifiable set of the fully qualified class 1389 * names of the service types used 1390 */ 1391 public Set<String> uses() { 1392 return uses; 1393 } 1394 1395 /** 1396 * <p> Returns the set of {@code Provides} objects representing the 1397 * services that the module provides. </p> 1398 * 1399 * @return The possibly-empty unmodifiable set of the services that this 1400 * module provides 1401 */ 1402 public Set<Provides> provides() { 1403 return provides; 1404 } 1405 1406 /** 1407 * <p> Returns the module version. </p> 1408 * 1409 * @return This module's version, or an empty {@code Optional} if the 1410 * module does not have a version or the version is 1411 * {@linkplain Version#parse(String) unparseable} 1412 */ 1413 public Optional<Version> version() { 1414 return Optional.ofNullable(version); 1415 } 1416 1417 /** 1418 * <p> Returns the string with the possibly-unparseable version of the 1419 * module </p> 1420 * 1421 * @return The string containing the version of the module or an empty 1422 * {@code Optional} if the module does not have a version 1423 * 1424 * @see #version() 1425 */ 1426 public Optional<String> rawVersion() { 1427 if (version != null) { 1428 return Optional.of(version.toString()); 1429 } else { 1430 return Optional.ofNullable(rawVersionString); 1431 } 1432 } 1433 1434 /** 1435 * <p> Returns a string containing the module name and, if present, its 1436 * version. </p> 1437 * 1438 * @return A string containing the module name and, if present, its 1439 * version 1440 */ 1441 public String toNameAndVersion() { 1442 if (version != null) { 1443 return name() + "@" + version; 1444 } else { 1445 return name(); 1446 } 1447 } 1448 1449 /** 1450 * <p> Returns the module main class. </p> 1451 * 1452 * @return The fully qualified class name of the module's main class 1453 */ 1454 public Optional<String> mainClass() { 1455 return Optional.ofNullable(mainClass); 1456 } 1457 1458 /** 1459 * Returns the set of packages in the module. 1460 * 1461 * <p> The set of packages includes all exported and open packages, as well 1462 * as the packages of any service providers, and the package for the main 1463 * class. </p> 1464 * 1465 * @return A possibly-empty unmodifiable set of the packages in the module 1466 */ 1467 public Set<String> packages() { 1468 return packages; 1469 } 1470 1471 1472 /** 1473 * A builder for building {@link ModuleDescriptor} objects. 1474 * 1475 * <p> {@code ModuleDescriptor} defines the {@link #newModule newModule}, 1476 * {@link #newOpenModule newOpenModule}, and {@link #newAutomaticModule 1477 * newAutomaticModule} methods to create builders for building 1478 * <em>normal</em>, open, and automatic modules. </p> 1479 * 1480 * <p> The set of packages in the module are accumulated by the {@code 1481 * Builder} as the {@link ModuleDescriptor.Builder#exports(String) exports}, 1482 * {@link ModuleDescriptor.Builder#opens(String) opens}, 1483 * {@link ModuleDescriptor.Builder#packages(Set) packages}, 1484 * {@link ModuleDescriptor.Builder#provides(String,List) provides}, and 1485 * {@link ModuleDescriptor.Builder#mainClass(String) mainClass} methods are 1486 * invoked. </p> 1487 * 1488 * <p> The module names, package names, and class names that are parameters 1489 * specified to the builder methods are the module names, package names, 1490 * and qualified names of classes (in named packages) as defined in the 1491 * <cite>The Java™ Language Specification</cite>. </p> 1492 * 1493 * <p> Example usage: </p> 1494 * <pre>{@code ModuleDescriptor descriptor = ModuleDescriptor.newModule("stats.core") 1495 * .requires("java.base") 1496 * .exports("org.acme.stats.core.clustering") 1497 * .exports("org.acme.stats.core.regression") 1498 * .packages(Set.of("org.acme.stats.core.internal")) 1499 * .build(); 1500 * }</pre> 1501 * 1502 * @apiNote A {@code Builder} checks the components and invariants as 1503 * components are added to the builder. The rationale for this is to detect 1504 * errors as early as possible and not defer all validation to the 1505 * {@link #build build} method. 1506 * 1507 * @since 9 1508 * @spec JPMS 1509 */ 1510 public static final class Builder { 1511 final String name; 1512 final boolean strict; 1513 final Set<Modifier> modifiers; 1514 final boolean open; 1515 final boolean automatic; 1516 final Set<String> packages = new HashSet<>(); 1517 final Map<String, Requires> requires = new HashMap<>(); 1518 final Map<String, Exports> exports = new HashMap<>(); 1519 final Map<String, Opens> opens = new HashMap<>(); 1520 final Set<String> uses = new HashSet<>(); 1521 final Map<String, Provides> provides = new HashMap<>(); 1522 Version version; 1523 String rawVersionString; 1524 String mainClass; 1525 1526 /** 1527 * Initializes a new builder with the given module name. 1528 * 1529 * If {@code strict} is {@code true} then module, package, and class 1530 * names are checked to ensure they are legal names. In addition, the 1531 * {@link #build buid} method will add "{@code requires java.base}" if 1532 * the dependency is not declared. 1533 */ 1534 Builder(String name, boolean strict, Set<Modifier> modifiers) { 1535 this.name = (strict) ? requireModuleName(name) : name; 1536 this.strict = strict; 1537 this.modifiers = modifiers; 1538 this.open = modifiers.contains(Modifier.OPEN); 1539 this.automatic = modifiers.contains(Modifier.AUTOMATIC); 1540 assert !open || !automatic; 1541 } 1542 1543 /** 1544 * Returns a snapshot of the packages in the module. 1545 */ 1546 /* package */ Set<String> packages() { 1547 return Collections.unmodifiableSet(packages); 1548 } 1549 1550 /** 1551 * Adds a dependence on a module. 1552 * 1553 * @param req 1554 * The dependence 1555 * 1556 * @return This builder 1557 * 1558 * @throws IllegalArgumentException 1559 * If the dependence is on the module that this builder was 1560 * initialized to build 1561 * @throws IllegalStateException 1562 * If the dependence on the module has already been declared 1563 * or this builder is for an automatic module 1564 */ 1565 public Builder requires(Requires req) { 1566 if (automatic) 1567 throw new IllegalStateException("Automatic modules cannot declare" 1568 + " dependences"); 1569 String mn = req.name(); 1570 if (name.equals(mn)) 1571 throw new IllegalArgumentException("Dependence on self"); 1572 if (requires.containsKey(mn)) 1573 throw new IllegalStateException("Dependence upon " + mn 1574 + " already declared"); 1575 requires.put(mn, req); 1576 return this; 1577 } 1578 1579 /** 1580 * Adds a dependence on a module with the given (and possibly empty) 1581 * set of modifiers. The dependence includes the version of the 1582 * module that was recorded at compile-time. 1583 * 1584 * @param ms 1585 * The set of modifiers 1586 * @param mn 1587 * The module name 1588 * @param compiledVersion 1589 * The version of the module recorded at compile-time 1590 * 1591 * @return This builder 1592 * 1593 * @throws IllegalArgumentException 1594 * If the module name is {@code null}, is not a legal module 1595 * name, or is equal to the module name that this builder 1596 * was initialized to build 1597 * @throws IllegalStateException 1598 * If the dependence on the module has already been declared 1599 * or this builder is for an automatic module 1600 */ 1601 public Builder requires(Set<Requires.Modifier> ms, 1602 String mn, 1603 Version compiledVersion) { 1604 Objects.requireNonNull(compiledVersion); 1605 if (strict) 1606 mn = requireModuleName(mn); 1607 return requires(new Requires(ms, mn, compiledVersion, null)); 1608 } 1609 1610 /* package */Builder requires(Set<Requires.Modifier> ms, 1611 String mn, 1612 String rawCompiledVersion) { 1613 Requires r; 1614 try { 1615 Version v = Version.parse(rawCompiledVersion); 1616 r = new Requires(ms, mn, v, null); 1617 } catch (IllegalArgumentException e) { 1618 if (strict) throw e; 1619 r = new Requires(ms, mn, null, rawCompiledVersion); 1620 } 1621 return requires(r); 1622 } 1623 1624 /** 1625 * Adds a dependence on a module with the given (and possibly empty) 1626 * set of modifiers. 1627 * 1628 * @param ms 1629 * The set of modifiers 1630 * @param mn 1631 * The module name 1632 * 1633 * @return This builder 1634 * 1635 * @throws IllegalArgumentException 1636 * If the module name is {@code null}, is not a legal module 1637 * name, or is equal to the module name that this builder 1638 * was initialized to build 1639 * @throws IllegalStateException 1640 * If the dependence on the module has already been declared 1641 * or this builder is for an automatic module 1642 */ 1643 public Builder requires(Set<Requires.Modifier> ms, String mn) { 1644 if (strict) 1645 mn = requireModuleName(mn); 1646 return requires(new Requires(ms, mn, null, null)); 1647 } 1648 1649 /** 1650 * Adds a dependence on a module with an empty set of modifiers. 1651 * 1652 * @param mn 1653 * The module name 1654 * 1655 * @return This builder 1656 * 1657 * @throws IllegalArgumentException 1658 * If the module name is {@code null}, is not a legal module 1659 * name, or is equal to the module name that this builder 1660 * was initialized to build 1661 * @throws IllegalStateException 1662 * If the dependence on the module has already been declared 1663 * or this builder is for an automatic module 1664 */ 1665 public Builder requires(String mn) { 1666 return requires(EnumSet.noneOf(Requires.Modifier.class), mn); 1667 } 1668 1669 /** 1670 * Adds an exported package. 1671 * 1672 * @param e 1673 * The export 1674 * 1675 * @return This builder 1676 * 1677 * @throws IllegalStateException 1678 * If the {@link Exports#source() package} is already declared as 1679 * exported or this builder is for an automatic module 1680 */ 1681 public Builder exports(Exports e) { 1682 if (automatic) { 1683 throw new IllegalStateException("Automatic modules cannot declare" 1684 + " exported packages"); 1685 } 1686 String source = e.source(); 1687 if (exports.containsKey(source)) { 1688 throw new IllegalStateException("Exported package " + source 1689 + " already declared"); 1690 } 1691 exports.put(source, e); 1692 packages.add(source); 1693 return this; 1694 } 1695 1696 /** 1697 * Adds an exported package with the given (and possibly empty) set of 1698 * modifiers. The package is exported to a set of target modules. 1699 * 1700 * @param ms 1701 * The set of modifiers 1702 * @param pn 1703 * The package name 1704 * @param targets 1705 * The set of target modules names 1706 * 1707 * @return This builder 1708 * 1709 * @throws IllegalArgumentException 1710 * If the package name is {@code null} or is not a legal 1711 * package name, the set of target modules is empty, or the set 1712 * of target modules contains a name that is not a legal module 1713 * name 1714 * @throws IllegalStateException 1715 * If the package is already declared as exported 1716 * or this builder is for an automatic module 1717 */ 1718 public Builder exports(Set<Exports.Modifier> ms, 1719 String pn, 1720 Set<String> targets) 1721 { 1722 targets = new HashSet<>(targets); 1723 if (targets.isEmpty()) 1724 throw new IllegalArgumentException("Empty target set"); 1725 if (strict) { 1726 requirePackageName(pn); 1727 targets.forEach(Checks::requireModuleName); 1728 } 1729 Exports e = new Exports(ms, pn, targets); 1730 return exports(e); 1731 } 1732 1733 /** 1734 * Adds an exported package with the given (and possibly empty) set of 1735 * modifiers. The package is exported to all modules. 1736 * 1737 * @param ms 1738 * The set of modifiers 1739 * @param pn 1740 * The package name 1741 * 1742 * @return This builder 1743 * 1744 * @throws IllegalArgumentException 1745 * If the package name is {@code null} or is not a legal 1746 * package name 1747 * @throws IllegalStateException 1748 * If the package is already declared as exported 1749 * or this builder is for an automatic module 1750 */ 1751 public Builder exports(Set<Exports.Modifier> ms, String pn) { 1752 if (strict) { 1753 requirePackageName(pn); 1754 } 1755 Exports e = new Exports(ms, pn, Set.of()); 1756 return exports(e); 1757 } 1758 1759 /** 1760 * Adds an exported package. The package is exported to a set of target 1761 * modules. 1762 * 1763 * @param pn 1764 * The package name 1765 * @param targets 1766 * The set of target modules names 1767 * 1768 * @return This builder 1769 * 1770 * @throws IllegalArgumentException 1771 * If the package name is {@code null} or is not a legal 1772 * package name, the set of target modules is empty, or the set 1773 * of target modules contains a name that is not a legal module 1774 * name 1775 * @throws IllegalStateException 1776 * If the package is already declared as exported 1777 * or this builder is for an automatic module 1778 */ 1779 public Builder exports(String pn, Set<String> targets) { 1780 return exports(Set.of(), pn, targets); 1781 } 1782 1783 /** 1784 * Adds an exported package. The package is exported to all modules. 1785 * 1786 * @param pn 1787 * The package name 1788 * 1789 * @return This builder 1790 * 1791 * @throws IllegalArgumentException 1792 * If the package name is {@code null} or is not a legal 1793 * package name 1794 * @throws IllegalStateException 1795 * If the package is already declared as exported 1796 * or this builder is for an automatic module 1797 */ 1798 public Builder exports(String pn) { 1799 return exports(Set.of(), pn); 1800 } 1801 1802 /** 1803 * Adds an open package. 1804 * 1805 * @param obj 1806 * The {@code Opens} object 1807 * 1808 * @return This builder 1809 * 1810 * @throws IllegalStateException 1811 * If the package is already declared as open, or this is a 1812 * builder for an open module or automatic module 1813 */ 1814 public Builder opens(Opens obj) { 1815 if (open || automatic) { 1816 throw new IllegalStateException("Open or automatic modules cannot" 1817 + " declare open packages"); 1818 } 1819 String source = obj.source(); 1820 if (opens.containsKey(source)) { 1821 throw new IllegalStateException("Open package " + source 1822 + " already declared"); 1823 } 1824 opens.put(source, obj); 1825 packages.add(source); 1826 return this; 1827 } 1828 1829 1830 /** 1831 * Adds an open package with the given (and possibly empty) set of 1832 * modifiers. The package is open to a set of target modules. 1833 * 1834 * @param ms 1835 * The set of modifiers 1836 * @param pn 1837 * The package name 1838 * @param targets 1839 * The set of target modules names 1840 * 1841 * @return This builder 1842 * 1843 * @throws IllegalArgumentException 1844 * If the package name is {@code null} or is not a legal 1845 * package name, the set of target modules is empty, or the set 1846 * of target modules contains a name that is not a legal module 1847 * name 1848 * @throws IllegalStateException 1849 * If the package is already declared as open, or this is a 1850 * builder for an open module or automatic module 1851 */ 1852 public Builder opens(Set<Opens.Modifier> ms, 1853 String pn, 1854 Set<String> targets) 1855 { 1856 targets = new HashSet<>(targets); 1857 if (targets.isEmpty()) 1858 throw new IllegalArgumentException("Empty target set"); 1859 if (strict) { 1860 requirePackageName(pn); 1861 targets.forEach(Checks::requireModuleName); 1862 } 1863 Opens opens = new Opens(ms, pn, targets); 1864 return opens(opens); 1865 } 1866 1867 /** 1868 * Adds an open package with the given (and possibly empty) set of 1869 * modifiers. The package is open to all modules. 1870 * 1871 * @param ms 1872 * The set of modifiers 1873 * @param pn 1874 * The package name 1875 * 1876 * @return This builder 1877 * 1878 * @throws IllegalArgumentException 1879 * If the package name is {@code null} or is not a legal 1880 * package name 1881 * @throws IllegalStateException 1882 * If the package is already declared as open, or this is a 1883 * builder for an open module or automatic module 1884 */ 1885 public Builder opens(Set<Opens.Modifier> ms, String pn) { 1886 if (strict) { 1887 requirePackageName(pn); 1888 } 1889 Opens e = new Opens(ms, pn, Set.of()); 1890 return opens(e); 1891 } 1892 1893 /** 1894 * Adds an open package. The package is open to a set of target modules. 1895 * 1896 * @param pn 1897 * The package name 1898 * @param targets 1899 * The set of target modules names 1900 * 1901 * @return This builder 1902 * 1903 * @throws IllegalArgumentException 1904 * If the package name is {@code null} or is not a legal 1905 * package name, the set of target modules is empty, or the set 1906 * of target modules contains a name that is not a legal module 1907 * name 1908 * @throws IllegalStateException 1909 * If the package is already declared as open, or this is a 1910 * builder for an open module or automatic module 1911 */ 1912 public Builder opens(String pn, Set<String> targets) { 1913 return opens(Set.of(), pn, targets); 1914 } 1915 1916 /** 1917 * Adds an open package. The package is open to all modules. 1918 * 1919 * @param pn 1920 * The package name 1921 * 1922 * @return This builder 1923 * 1924 * @throws IllegalArgumentException 1925 * If the package name is {@code null} or is not a legal 1926 * package name 1927 * @throws IllegalStateException 1928 * If the package is already declared as open, or this is a 1929 * builder for an open module or automatic module 1930 */ 1931 public Builder opens(String pn) { 1932 return opens(Set.of(), pn); 1933 } 1934 1935 /** 1936 * Adds a service dependence. 1937 * 1938 * @param service 1939 * The service type 1940 * 1941 * @return This builder 1942 * 1943 * @throws IllegalArgumentException 1944 * If the service type is {@code null} or not a qualified name of 1945 * a class in a named package 1946 * @throws IllegalStateException 1947 * If a dependency on the service type has already been declared 1948 * or this is a builder for an automatic module 1949 */ 1950 public Builder uses(String service) { 1951 if (automatic) 1952 throw new IllegalStateException("Automatic modules can not declare" 1953 + " service dependences"); 1954 if (uses.contains(requireServiceTypeName(service))) 1955 throw new IllegalStateException("Dependence upon service " 1956 + service + " already declared"); 1957 uses.add(service); 1958 return this; 1959 } 1960 1961 /** 1962 * Provides a service with one or more implementations. The package for 1963 * each {@link Provides#providers provider} (or provider factory) is 1964 * added to the module if not already added. 1965 * 1966 * @param p 1967 * The provides 1968 * 1969 * @return This builder 1970 * 1971 * @throws IllegalStateException 1972 * If the providers for the service type have already been 1973 * declared 1974 */ 1975 public Builder provides(Provides p) { 1976 String service = p.service(); 1977 if (provides.containsKey(service)) 1978 throw new IllegalStateException("Providers of service " 1979 + service + " already declared"); 1980 provides.put(service, p); 1981 p.providers().forEach(name -> packages.add(packageName(name))); 1982 return this; 1983 } 1984 1985 /** 1986 * Provides implementations of a service. The package for each provider 1987 * (or provider factory) is added to the module if not already added. 1988 * 1989 * @param service 1990 * The service type 1991 * @param providers 1992 * The list of provider or provider factory class names 1993 * 1994 * @return This builder 1995 * 1996 * @throws IllegalArgumentException 1997 * If the service type or any of the provider class names is 1998 * {@code null} or not a qualified name of a class in a named 1999 * package, or the list of provider class names is empty 2000 * @throws IllegalStateException 2001 * If the providers for the service type have already been 2002 * declared 2003 */ 2004 public Builder provides(String service, List<String> providers) { 2005 providers = new ArrayList<>(providers); 2006 if (providers.isEmpty()) 2007 throw new IllegalArgumentException("Empty providers set"); 2008 if (strict) { 2009 requireServiceTypeName(service); 2010 providers.forEach(Checks::requireServiceProviderName); 2011 } else { 2012 // Disallow service/providers in unnamed package 2013 String pn = packageName(service); 2014 if (pn.isEmpty()) { 2015 throw new IllegalArgumentException(service 2016 + ": unnamed package"); 2017 } 2018 for (String name : providers) { 2019 pn = packageName(name); 2020 if (pn.isEmpty()) { 2021 throw new IllegalArgumentException(name 2022 + ": unnamed package"); 2023 } 2024 } 2025 } 2026 Provides p = new Provides(service, providers); 2027 return provides(p); 2028 } 2029 2030 /** 2031 * Adds packages to the module. All packages in the set of package names 2032 * that are not in the module are added to module. 2033 * 2034 * @param pns 2035 * The (possibly empty) set of package names 2036 * 2037 * @return This builder 2038 * 2039 * @throws IllegalArgumentException 2040 * If any of the package names is {@code null} or is not a 2041 * legal package name 2042 */ 2043 public Builder packages(Set<String> pns) { 2044 if (strict) { 2045 pns = new HashSet<>(pns); 2046 pns.forEach(Checks::requirePackageName); 2047 } 2048 this.packages.addAll(pns); 2049 return this; 2050 } 2051 2052 /** 2053 * Sets the module version. 2054 * 2055 * @param v 2056 * The version 2057 * 2058 * @return This builder 2059 */ 2060 public Builder version(Version v) { 2061 version = requireNonNull(v); 2062 rawVersionString = null; 2063 return this; 2064 } 2065 2066 /** 2067 * Sets the module version. 2068 * 2069 * @param vs 2070 * The version string to parse 2071 * 2072 * @return This builder 2073 * 2074 * @throws IllegalArgumentException 2075 * If {@code vs} is {@code null} or cannot be parsed as a 2076 * version string 2077 * 2078 * @see Version#parse(String) 2079 */ 2080 public Builder version(String vs) { 2081 try { 2082 version = Version.parse(vs); 2083 rawVersionString = null; 2084 } catch (IllegalArgumentException e) { 2085 if (strict) throw e; 2086 version = null; 2087 rawVersionString = vs; 2088 } 2089 return this; 2090 } 2091 2092 /** 2093 * Sets the module main class. The package for the main class is added 2094 * to the module if not already added. In other words, this method is 2095 * equivalent to first invoking this builder's {@link #packages(Set) 2096 * packages} method to add the package name of the main class. 2097 * 2098 * @param mc 2099 * The module main class 2100 * 2101 * @return This builder 2102 * 2103 * @throws IllegalArgumentException 2104 * If {@code mainClass} is {@code null} or not a qualified 2105 * name of a class in a named package 2106 */ 2107 public Builder mainClass(String mc) { 2108 String pn; 2109 if (strict) { 2110 mc = requireQualifiedClassName("main class name", mc); 2111 pn = packageName(mc); 2112 assert !pn.isEmpty(); 2113 } else { 2114 // Disallow main class in unnamed package 2115 pn = packageName(mc); 2116 if (pn.isEmpty()) { 2117 throw new IllegalArgumentException(mc + ": unnamed package"); 2118 } 2119 } 2120 packages.add(pn); 2121 mainClass = mc; 2122 return this; 2123 } 2124 2125 /** 2126 * Builds and returns a {@code ModuleDescriptor} from its components. 2127 * 2128 * <p> The module will require "{@code java.base}" even if the dependence 2129 * has not been declared (the exception is when building a module named 2130 * "{@code java.base}" as it cannot require itself). The dependence on 2131 * "{@code java.base}" will have the {@link 2132 * java.lang.module.ModuleDescriptor.Requires.Modifier#MANDATED MANDATED} 2133 * modifier if the dependence was not declared. </p> 2134 * 2135 * @return The module descriptor 2136 */ 2137 public ModuleDescriptor build() { 2138 Set<Requires> requires = new HashSet<>(this.requires.values()); 2139 Set<Exports> exports = new HashSet<>(this.exports.values()); 2140 Set<Opens> opens = new HashSet<>(this.opens.values()); 2141 2142 // add dependency on java.base 2143 if (strict 2144 && !name.equals("java.base") 2145 && !this.requires.containsKey("java.base")) { 2146 requires.add(new Requires(Set.of(Requires.Modifier.MANDATED), 2147 "java.base", 2148 null, 2149 null)); 2150 } 2151 2152 Set<Provides> provides = new HashSet<>(this.provides.values()); 2153 2154 return new ModuleDescriptor(name, 2155 version, 2156 rawVersionString, 2157 modifiers, 2158 requires, 2159 exports, 2160 opens, 2161 uses, 2162 provides, 2163 packages, 2164 mainClass); 2165 } 2166 2167 } 2168 2169 /** 2170 * Compares this module descriptor to another. 2171 * 2172 * <p> Two {@code ModuleDescriptor} objects are compared by comparing their 2173 * module names lexicographically. Where the module names are equal then the 2174 * module versions are compared. When comparing the module versions then a 2175 * module descriptor with a version is considered to succeed a module 2176 * descriptor that does not have a version. If both versions are {@linkplain 2177 * Version#parse(String) unparseable} then the {@linkplain #rawVersion() 2178 * raw version strings} are compared lexicographically. Where the module names 2179 * are equal and the versions are equal (or not present in both), then the 2180 * set of modifiers are compared. Sets of modifiers are compared by comparing 2181 * a <em>binary value</em> computed for each set. If a modifier is present 2182 * in the set then the bit at the position of its ordinal is {@code 1} 2183 * in the binary value, otherwise {@code 0}. If the two set of modifiers 2184 * are also equal then the other components of the module descriptors are 2185 * compared in a manner that is consistent with {@code equals}. </p> 2186 * 2187 * @param that 2188 * The module descriptor to compare 2189 * 2190 * @return A negative integer, zero, or a positive integer if this module 2191 * descriptor is less than, equal to, or greater than the given 2192 * module descriptor 2193 */ 2194 @Override 2195 public int compareTo(ModuleDescriptor that) { 2196 if (this == that) return 0; 2197 2198 int c = this.name().compareTo(that.name()); 2199 if (c != 0) return c; 2200 2201 c = compare(this.version, that.version); 2202 if (c != 0) return c; 2203 2204 c = compare(this.rawVersionString, that.rawVersionString); 2205 if (c != 0) return c; 2206 2207 long v1 = modsValue(this.modifiers()); 2208 long v2 = modsValue(that.modifiers()); 2209 c = Long.compare(v1, v2); 2210 if (c != 0) return c; 2211 2212 c = compare(this.requires, that.requires); 2213 if (c != 0) return c; 2214 2215 c = compare(this.packages, that.packages); 2216 if (c != 0) return c; 2217 2218 c = compare(this.exports, that.exports); 2219 if (c != 0) return c; 2220 2221 c = compare(this.opens, that.opens); 2222 if (c != 0) return c; 2223 2224 c = compare(this.uses, that.uses); 2225 if (c != 0) return c; 2226 2227 c = compare(this.provides, that.provides); 2228 if (c != 0) return c; 2229 2230 c = compare(this.mainClass, that.mainClass); 2231 if (c != 0) return c; 2232 2233 return 0; 2234 } 2235 2236 /** 2237 * Tests this module descriptor for equality with the given object. 2238 * 2239 * <p> If the given object is not a {@code ModuleDescriptor} then this 2240 * method returns {@code false}. Two module descriptors are equal if each 2241 * of their corresponding components is equal. </p> 2242 * 2243 * <p> This method satisfies the general contract of the {@link 2244 * java.lang.Object#equals(Object) Object.equals} method. </p> 2245 * 2246 * @param ob 2247 * the object to which this object is to be compared 2248 * 2249 * @return {@code true} if, and only if, the given object is a module 2250 * descriptor that is equal to this module descriptor 2251 */ 2252 @Override 2253 public boolean equals(Object ob) { 2254 if (ob == this) 2255 return true; 2256 if (!(ob instanceof ModuleDescriptor)) 2257 return false; 2258 ModuleDescriptor that = (ModuleDescriptor)ob; 2259 return (name.equals(that.name) 2260 && modifiers.equals(that.modifiers) 2261 && requires.equals(that.requires) 2262 && Objects.equals(packages, that.packages) 2263 && exports.equals(that.exports) 2264 && opens.equals(that.opens) 2265 && uses.equals(that.uses) 2266 && provides.equals(that.provides) 2267 && Objects.equals(version, that.version) 2268 && Objects.equals(rawVersionString, that.rawVersionString) 2269 && Objects.equals(mainClass, that.mainClass)); 2270 } 2271 2272 /** 2273 * Computes a hash code for this module descriptor. 2274 * 2275 * <p> The hash code is based upon the components of the module descriptor, 2276 * and satisfies the general contract of the {@link Object#hashCode 2277 * Object.hashCode} method. </p> 2278 * 2279 * @return The hash-code value for this module descriptor 2280 */ 2281 @Override 2282 public int hashCode() { 2283 int hc = hash; 2284 if (hc == 0) { 2285 hc = name.hashCode(); 2286 hc = hc * 43 + Objects.hashCode(modifiers); 2287 hc = hc * 43 + requires.hashCode(); 2288 hc = hc * 43 + Objects.hashCode(packages); 2289 hc = hc * 43 + exports.hashCode(); 2290 hc = hc * 43 + opens.hashCode(); 2291 hc = hc * 43 + uses.hashCode(); 2292 hc = hc * 43 + provides.hashCode(); 2293 hc = hc * 43 + Objects.hashCode(version); 2294 hc = hc * 43 + Objects.hashCode(rawVersionString); 2295 hc = hc * 43 + Objects.hashCode(mainClass); 2296 if (hc == 0) 2297 hc = -1; 2298 hash = hc; 2299 } 2300 return hc; 2301 } 2302 private transient int hash; // cached hash code 2303 2304 /** 2305 * <p> Returns a string describing the module. </p> 2306 * 2307 * @return A string describing the module 2308 */ 2309 @Override 2310 public String toString() { 2311 StringBuilder sb = new StringBuilder(); 2312 2313 if (isOpen()) 2314 sb.append("open "); 2315 sb.append("module { name: ").append(toNameAndVersion()); 2316 if (!requires.isEmpty()) 2317 sb.append(", ").append(requires); 2318 if (!uses.isEmpty()) 2319 sb.append(", uses: ").append(uses); 2320 if (!exports.isEmpty()) 2321 sb.append(", exports: ").append(exports); 2322 if (!opens.isEmpty()) 2323 sb.append(", opens: ").append(opens); 2324 if (!provides.isEmpty()) { 2325 sb.append(", provides: ").append(provides); 2326 } 2327 sb.append(" }"); 2328 return sb.toString(); 2329 } 2330 2331 2332 /** 2333 * Instantiates a builder to build a module descriptor. 2334 * 2335 * @param name 2336 * The module name 2337 * @param ms 2338 * The set of module modifiers 2339 * 2340 * @return A new builder 2341 * 2342 * @throws IllegalArgumentException 2343 * If the module name is {@code null} or is not a legal module 2344 * name, or the set of modifiers contains {@link 2345 * Modifier#AUTOMATIC AUTOMATIC} with other modifiers 2346 */ 2347 public static Builder newModule(String name, Set<Modifier> ms) { 2348 Set<Modifier> mods = new HashSet<>(ms); 2349 if (mods.contains(Modifier.AUTOMATIC) && mods.size() > 1) 2350 throw new IllegalArgumentException("AUTOMATIC cannot be used with" 2351 + " other modifiers"); 2352 2353 return new Builder(name, true, mods); 2354 } 2355 2356 /** 2357 * Instantiates a builder to build a module descriptor for a <em>normal</em> 2358 * module. This method is equivalent to invoking {@link #newModule(String,Set) 2359 * newModule} with an empty set of {@link ModuleDescriptor.Modifier modifiers}. 2360 * 2361 * @param name 2362 * The module name 2363 * 2364 * @return A new builder 2365 * 2366 * @throws IllegalArgumentException 2367 * If the module name is {@code null} or is not a legal module 2368 * name 2369 */ 2370 public static Builder newModule(String name) { 2371 return new Builder(name, true, Set.of()); 2372 } 2373 2374 /** 2375 * Instantiates a builder to build a module descriptor for an open module. 2376 * This method is equivalent to invoking {@link #newModule(String,Set) 2377 * newModule} with the {@link ModuleDescriptor.Modifier#OPEN OPEN} modifier. 2378 * 2379 * <p> The builder for an open module cannot be used to declare any open 2380 * packages. </p> 2381 * 2382 * @param name 2383 * The module name 2384 * 2385 * @return A new builder that builds an open module 2386 * 2387 * @throws IllegalArgumentException 2388 * If the module name is {@code null} or is not a legal module 2389 * name 2390 */ 2391 public static Builder newOpenModule(String name) { 2392 return new Builder(name, true, Set.of(Modifier.OPEN)); 2393 } 2394 2395 /** 2396 * Instantiates a builder to build a module descriptor for an automatic 2397 * module. This method is equivalent to invoking {@link #newModule(String,Set) 2398 * newModule} with the {@link ModuleDescriptor.Modifier#AUTOMATIC AUTOMATIC} 2399 * modifier. 2400 * 2401 * <p> The builder for an automatic module cannot be used to declare module 2402 * or service dependences. It also cannot be used to declare any exported 2403 * or open packages. </p> 2404 * 2405 * @param name 2406 * The module name 2407 * 2408 * @return A new builder that builds an automatic module 2409 * 2410 * @throws IllegalArgumentException 2411 * If the module name is {@code null} or is not a legal module 2412 * name 2413 * 2414 * @see ModuleFinder#of(Path[]) 2415 */ 2416 public static Builder newAutomaticModule(String name) { 2417 return new Builder(name, true, Set.of(Modifier.AUTOMATIC)); 2418 } 2419 2420 2421 /** 2422 * Reads the binary form of a module declaration from an input stream 2423 * as a module descriptor. 2424 * 2425 * <p> If the descriptor encoded in the input stream does not indicate a 2426 * set of packages in the module then the {@code packageFinder} will be 2427 * invoked. The set of packages that the {@code packageFinder} returns 2428 * must include all the packages that the module exports, opens, as well 2429 * as the packages of the service implementations that the module provides, 2430 * and the package of the main class (if the module has a main class). If 2431 * the {@code packageFinder} throws an {@link UncheckedIOException} then 2432 * {@link IOException} cause will be re-thrown. </p> 2433 * 2434 * <p> If there are bytes following the module descriptor then it is 2435 * implementation specific as to whether those bytes are read, ignored, 2436 * or reported as an {@code InvalidModuleDescriptorException}. If this 2437 * method fails with an {@code InvalidModuleDescriptorException} or {@code 2438 * IOException} then it may do so after some, but not all, bytes have 2439 * been read from the input stream. It is strongly recommended that the 2440 * stream be promptly closed and discarded if an exception occurs. </p> 2441 * 2442 * @apiNote The {@code packageFinder} parameter is for use when reading 2443 * module descriptors from legacy module-artifact formats that do not 2444 * record the set of packages in the descriptor itself. 2445 * 2446 * @param in 2447 * The input stream 2448 * @param packageFinder 2449 * A supplier that can produce the set of packages 2450 * 2451 * @return The module descriptor 2452 * 2453 * @throws InvalidModuleDescriptorException 2454 * If an invalid module descriptor is detected or the set of 2455 * packages returned by the {@code packageFinder} does not include 2456 * all of the packages obtained from the module descriptor 2457 * @throws IOException 2458 * If an I/O error occurs reading from the input stream or {@code 2459 * UncheckedIOException} is thrown by the package finder 2460 */ 2461 public static ModuleDescriptor read(InputStream in, 2462 Supplier<Set<String>> packageFinder) 2463 throws IOException 2464 { 2465 return ModuleInfo.read(in, requireNonNull(packageFinder)).descriptor(); 2466 } 2467 2468 /** 2469 * Reads the binary form of a module declaration from an input stream as a 2470 * module descriptor. This method works exactly as specified by the 2-arg 2471 * {@link #read(InputStream,Supplier) read} method with the exception that 2472 * a packager finder is not used to find additional packages when the 2473 * module descriptor read from the stream does not indicate the set of 2474 * packages. 2475 * 2476 * @param in 2477 * The input stream 2478 * 2479 * @return The module descriptor 2480 * 2481 * @throws InvalidModuleDescriptorException 2482 * If an invalid module descriptor is detected 2483 * @throws IOException 2484 * If an I/O error occurs reading from the input stream 2485 */ 2486 public static ModuleDescriptor read(InputStream in) throws IOException { 2487 return ModuleInfo.read(in, null).descriptor(); 2488 } 2489 2490 /** 2491 * Reads the binary form of a module declaration from a byte buffer 2492 * as a module descriptor. 2493 * 2494 * <p> If the descriptor encoded in the byte buffer does not indicate a 2495 * set of packages in the module then the {@code packageFinder} will be 2496 * invoked. The set of packages that the {@code packageFinder} returns 2497 * must include all the packages that the module exports, opens, as well 2498 * as the packages of the service implementations that the module provides, 2499 * and the package of the main class (if the module has a main class). If 2500 * the {@code packageFinder} throws an {@link UncheckedIOException} then 2501 * {@link IOException} cause will be re-thrown. </p> 2502 * 2503 * <p> The module descriptor is read from the buffer starting at index 2504 * {@code p}, where {@code p} is the buffer's {@link ByteBuffer#position() 2505 * position} when this method is invoked. Upon return the buffer's position 2506 * will be equal to {@code p + n} where {@code n} is the number of bytes 2507 * read from the buffer. </p> 2508 * 2509 * <p> If there are bytes following the module descriptor then it is 2510 * implementation specific as to whether those bytes are read, ignored, 2511 * or reported as an {@code InvalidModuleDescriptorException}. If this 2512 * method fails with an {@code InvalidModuleDescriptorException} then it 2513 * may do so after some, but not all, bytes have been read. </p> 2514 * 2515 * @apiNote The {@code packageFinder} parameter is for use when reading 2516 * module descriptors from legacy module-artifact formats that do not 2517 * record the set of packages in the descriptor itself. 2518 * 2519 * @param bb 2520 * The byte buffer 2521 * @param packageFinder 2522 * A supplier that can produce the set of packages 2523 * 2524 * @return The module descriptor 2525 * 2526 * @throws InvalidModuleDescriptorException 2527 * If an invalid module descriptor is detected or the set of 2528 * packages returned by the {@code packageFinder} does not include 2529 * all of the packages obtained from the module descriptor 2530 */ 2531 public static ModuleDescriptor read(ByteBuffer bb, 2532 Supplier<Set<String>> packageFinder) 2533 { 2534 return ModuleInfo.read(bb, requireNonNull(packageFinder)).descriptor(); 2535 } 2536 2537 /** 2538 * Reads the binary form of a module declaration from a byte buffer as a 2539 * module descriptor. This method works exactly as specified by the 2-arg 2540 * {@link #read(ByteBuffer,Supplier) read} method with the exception that a 2541 * packager finder is not used to find additional packages when the module 2542 * descriptor encoded in the buffer does not indicate the set of packages. 2543 * 2544 * @param bb 2545 * The byte buffer 2546 * 2547 * @return The module descriptor 2548 * 2549 * @throws InvalidModuleDescriptorException 2550 * If an invalid module descriptor is detected 2551 */ 2552 public static ModuleDescriptor read(ByteBuffer bb) { 2553 return ModuleInfo.read(bb, null).descriptor(); 2554 } 2555 2556 private static String packageName(String cn) { 2557 int index = cn.lastIndexOf('.'); 2558 return (index == -1) ? "" : cn.substring(0, index); 2559 } 2560 2561 /** 2562 * Returns a string containing the given set of modifiers and label. 2563 */ 2564 private static <M> String toString(Set<M> mods, String what) { 2565 return (Stream.concat(mods.stream().map(e -> e.toString() 2566 .toLowerCase(Locale.ROOT)), 2567 Stream.of(what))) 2568 .collect(Collectors.joining(" ")); 2569 } 2570 2571 private static <T extends Object & Comparable<? super T>> 2572 int compare(T obj1, T obj2) { 2573 if (obj1 != null) { 2574 return (obj2 != null) ? obj1.compareTo(obj2) : 1; 2575 } else { 2576 return (obj2 == null) ? 0 : -1; 2577 } 2578 } 2579 2580 /** 2581 * Compares two sets of {@code Comparable} objects. 2582 */ 2583 @SuppressWarnings("unchecked") 2584 private static <T extends Object & Comparable<? super T>> 2585 int compare(Set<T> s1, Set<T> s2) { 2586 T[] a1 = (T[]) s1.toArray(); 2587 T[] a2 = (T[]) s2.toArray(); 2588 Arrays.sort(a1); 2589 Arrays.sort(a2); 2590 return Arrays.compare(a1, a2); 2591 } 2592 2593 private static <E extends Enum<E>> long modsValue(Set<E> set) { 2594 long value = 0; 2595 for (Enum<E> e : set) { 2596 value += 1 << e.ordinal(); 2597 } 2598 return value; 2599 } 2600 2601 static { 2602 /** 2603 * Setup the shared secret to allow code in other packages access 2604 * private package methods in java.lang.module. 2605 */ 2606 jdk.internal.misc.SharedSecrets 2607 .setJavaLangModuleAccess(new jdk.internal.misc.JavaLangModuleAccess() { 2608 @Override 2609 public Builder newModuleBuilder(String mn, 2610 boolean strict, 2611 Set<ModuleDescriptor.Modifier> modifiers) { 2612 return new Builder(mn, strict, modifiers); 2613 } 2614 2615 @Override 2616 public Set<String> packages(ModuleDescriptor.Builder builder) { 2617 return builder.packages(); 2618 } 2619 2620 @Override 2621 public void requires(ModuleDescriptor.Builder builder, 2622 Set<Requires.Modifier> ms, 2623 String mn, 2624 String rawCompiledVersion) { 2625 builder.requires(ms, mn, rawCompiledVersion); 2626 } 2627 2628 @Override 2629 public Requires newRequires(Set<Requires.Modifier> ms, String mn, Version v) { 2630 return new Requires(ms, mn, v, true); 2631 } 2632 2633 @Override 2634 public Exports newExports(Set<Exports.Modifier> ms, String source) { 2635 return new Exports(ms, source, Set.of(), true); 2636 } 2637 2638 @Override 2639 public Exports newExports(Set<Exports.Modifier> ms, 2640 String source, 2641 Set<String> targets) { 2642 return new Exports(ms, source, targets, true); 2643 } 2644 2645 @Override 2646 public Opens newOpens(Set<Opens.Modifier> ms, 2647 String source, 2648 Set<String> targets) { 2649 return new Opens(ms, source, targets, true); 2650 } 2651 2652 @Override 2653 public Opens newOpens(Set<Opens.Modifier> ms, String source) { 2654 return new Opens(ms, source, Set.of(), true); 2655 } 2656 2657 @Override 2658 public Provides newProvides(String service, List<String> providers) { 2659 return new Provides(service, providers, true); 2660 } 2661 2662 @Override 2663 public ModuleDescriptor newModuleDescriptor(String name, 2664 Version version, 2665 Set<ModuleDescriptor.Modifier> modifiers, 2666 Set<Requires> requires, 2667 Set<Exports> exports, 2668 Set<Opens> opens, 2669 Set<String> uses, 2670 Set<Provides> provides, 2671 Set<String> packages, 2672 String mainClass, 2673 int hashCode) { 2674 return new ModuleDescriptor(name, 2675 version, 2676 modifiers, 2677 requires, 2678 exports, 2679 opens, 2680 uses, 2681 provides, 2682 packages, 2683 mainClass, 2684 hashCode, 2685 false); 2686 } 2687 2688 @Override 2689 public Configuration resolveAndBind(ModuleFinder finder, 2690 Collection<String> roots, 2691 PrintStream traceOutput) 2692 { 2693 return Configuration.resolveAndBind(finder, roots, traceOutput); 2694 } 2695 2696 @Override 2697 public Configuration newConfiguration(ModuleFinder finder, 2698 Map<String, Set<String>> graph) { 2699 return new Configuration(finder, graph); 2700 } 2701 }); 2702 } 2703 2704 }