1 /* 2 * Copyright (c) 1999, 2013, 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 javax.naming; 27 28 import java.util.Enumeration; 29 import java.util.Properties; 30 31 /** 32 * This class represents a compound name -- a name from 33 * a hierarchical name space. 34 * Each component in a compound name is an atomic name. 35 * <p> 36 * The components of a compound name are numbered. The indexes of a 37 * compound name with N components range from 0 up to, but not including, N. 38 * This range may be written as [0,N). 39 * The most significant component is at index 0. 40 * An empty compound name has no components. 41 * 42 * <h1>Compound Name Syntax</h1> 43 * The syntax of a compound name is specified using a set of properties: 44 *<dl> 45 * <dt>jndi.syntax.direction 46 * <dd>Direction for parsing ("right_to_left", "left_to_right", "flat"). 47 * If unspecified, defaults to "flat", which means the namespace is flat 48 * with no hierarchical structure. 49 * 50 * <dt>jndi.syntax.separator 51 * <dd>Separator between atomic name components. 52 * Required unless direction is "flat". 53 * 54 * <dt>jndi.syntax.ignorecase 55 * <dd>If present, "true" means ignore the case when comparing name 56 * components. If its value is not "true", or if the property is not 57 * present, case is considered when comparing name components. 58 * 59 * <dt>jndi.syntax.escape 60 * <dd>If present, specifies the escape string for overriding separator, 61 * escapes and quotes. 62 * 63 * <dt>jndi.syntax.beginquote 64 * <dd>If present, specifies the string delimiting start of a quoted string. 65 * 66 * <dt>jndi.syntax.endquote 67 * <dd>String delimiting end of quoted string. 68 * If present, specifies the string delimiting the end of a quoted string. 69 * If not present, use syntax.beginquote as end quote. 70 * <dt>jndi.syntax.beginquote2 71 * <dd>Alternative set of begin/end quotes. 72 * 73 * <dt>jndi.syntax.endquote2 74 * <dd>Alternative set of begin/end quotes. 75 * 76 * <dt>jndi.syntax.trimblanks 77 * <dd>If present, "true" means trim any leading and trailing whitespaces 78 * in a name component for comparison purposes. If its value is not 79 * "true", or if the property is not present, blanks are significant. 80 * <dt>jndi.syntax.separator.ava 81 * <dd>If present, specifies the string that separates 82 * attribute-value-assertions when specifying multiple attribute/value 83 * pairs. (e.g. "," in age=65,gender=male). 84 * <dt>jndi.syntax.separator.typeval 85 * <dd>If present, specifies the string that separates attribute 86 * from value (e.g. "=" in "age=65") 87 *</dl> 88 * These properties are interpreted according to the following rules: 89 *<ol> 90 *<li> 91 * In a string without quotes or escapes, any instance of the 92 * separator delimits two atomic names. Each atomic name is referred 93 * to as a <em>component</em>. 94 *<li> 95 * A separator, quote or escape is escaped if preceded immediately 96 * (on the left) by the escape. 97 *<li> 98 * If there are two sets of quotes, a specific begin-quote must be matched 99 * by its corresponding end-quote. 100 *<li> 101 * A non-escaped begin-quote which precedes a component must be 102 * matched by a non-escaped end-quote at the end of the component. 103 * A component thus quoted is referred to as a 104 * <em>quoted component</em>. It is parsed by 105 * removing the being- and end- quotes, and by treating the intervening 106 * characters as ordinary characters unless one of the rules involving 107 * quoted components listed below applies. 108 *<li> 109 * Quotes embedded in non-quoted components are treated as ordinary strings 110 * and need not be matched. 111 *<li> 112 * A separator that is escaped or appears between non-escaped 113 * quotes is treated as an ordinary string and not a separator. 114 *<li> 115 * An escape string within a quoted component acts as an escape only when 116 * followed by the corresponding end-quote string. 117 * This can be used to embed an escaped quote within a quoted component. 118 *<li> 119 * An escaped escape string is not treated as an escape string. 120 *<li> 121 * An escape string that does not precede a meta string (quotes or separator) 122 * and is not at the end of a component is treated as an ordinary string. 123 *<li> 124 * A leading separator (the compound name string begins with 125 * a separator) denotes a leading empty atomic component (consisting 126 * of an empty string). 127 * A trailing separator (the compound name string ends with 128 * a separator) denotes a trailing empty atomic component. 129 * Adjacent separators denote an empty atomic component. 130 *</ol> 131 * <p> 132 * The string form of the compound name follows the syntax described above. 133 * When the components of the compound name are turned into their 134 * string representation, the reserved syntax rules described above are 135 * applied (e.g. embedded separators are escaped or quoted) 136 * so that when the same string is parsed, it will yield the same components 137 * of the original compound name. 138 * 139 *<h1>Multithreaded Access</h1> 140 * A {@code CompoundName} instance is not synchronized against concurrent 141 * multithreaded access. Multiple threads trying to access and modify a 142 * {@code CompoundName} should lock the object. 143 * 144 * @author Rosanna Lee 145 * @author Scott Seligman 146 * @since 1.3 147 */ 148 149 public class CompoundName implements Name { 150 151 /** 152 * Implementation of this compound name. 153 * This field is initialized by the constructors and cannot be null. 154 * It should be treated as a read-only variable by subclasses. 155 */ 156 @SuppressWarnings("unexportedinapi") 157 protected transient NameImpl impl; 158 /** 159 * Syntax properties for this compound name. 160 * This field is initialized by the constructors and cannot be null. 161 * It should be treated as a read-only variable by subclasses. 162 * Any necessary changes to mySyntax should be made within constructors 163 * and not after the compound name has been instantiated. 164 */ 165 protected transient Properties mySyntax; 166 167 /** 168 * Constructs a new compound name instance using the components 169 * specified in comps and syntax. This protected method is intended 170 * to be used by subclasses of CompoundName when they override 171 * methods such as clone(), getPrefix(), getSuffix(). 172 * 173 * @param comps A non-null enumeration of the components to add. 174 * Each element of the enumeration is of class String. 175 * The enumeration will be consumed to extract its 176 * elements. 177 * @param syntax A non-null properties that specify the syntax of 178 * this compound name. See class description for 179 * contents of properties. 180 */ 181 protected CompoundName(Enumeration<String> comps, Properties syntax) { 182 if (syntax == null) { 183 throw new NullPointerException(); 184 } 185 mySyntax = syntax; 186 impl = new NameImpl(syntax, comps); 187 } 188 189 /** 190 * Constructs a new compound name instance by parsing the string n 191 * using the syntax specified by the syntax properties supplied. 192 * 193 * @param n The non-null string to parse. 194 * @param syntax A non-null list of properties that specify the syntax of 195 * this compound name. See class description for 196 * contents of properties. 197 * @exception InvalidNameException If 'n' violates the syntax specified 198 * by {@code syntax}. 199 */ 200 public CompoundName(String n, Properties syntax) throws InvalidNameException { 201 if (syntax == null) { 202 throw new NullPointerException(); 203 } 204 mySyntax = syntax; 205 impl = new NameImpl(syntax, n); 206 } 207 208 /** 209 * Generates the string representation of this compound name, using 210 * the syntax rules of the compound name. The syntax rules 211 * are described in the class description. 212 * An empty component is represented by an empty string. 213 * 214 * The string representation thus generated can be passed to 215 * the CompoundName constructor with the same syntax properties 216 * to create a new equivalent compound name. 217 * 218 * @return A non-null string representation of this compound name. 219 */ 220 public String toString() { 221 return (impl.toString()); 222 } 223 224 /** 225 * Determines whether obj is syntactically equal to this compound name. 226 * If obj is null or not a CompoundName, false is returned. 227 * Two compound names are equal if each component in one is "equal" 228 * to the corresponding component in the other. 229 *<p> 230 * Equality is also defined in terms of the syntax of this compound name. 231 * The default implementation of CompoundName uses the syntax properties 232 * jndi.syntax.ignorecase and jndi.syntax.trimblanks when comparing 233 * two components for equality. If case is ignored, two strings 234 * with the same sequence of characters but with different cases 235 * are considered equal. If blanks are being trimmed, leading and trailing 236 * blanks are ignored for the purpose of the comparison. 237 *<p> 238 * Both compound names must have the same number of components. 239 *<p> 240 * Implementation note: Currently the syntax properties of the two compound 241 * names are not compared for equality. They might be in the future. 242 * 243 * @param obj The possibly null object to compare against. 244 * @return true if obj is equal to this compound name, false otherwise. 245 * @see #compareTo(java.lang.Object obj) 246 */ 247 public boolean equals(Object obj) { 248 // %%% check syntax too? 249 return (obj != null && 250 obj instanceof CompoundName && 251 impl.equals(((CompoundName)obj).impl)); 252 } 253 254 /** 255 * Computes the hash code of this compound name. 256 * The hash code is the sum of the hash codes of the "canonicalized" 257 * forms of individual components of this compound name. 258 * Each component is "canonicalized" according to the 259 * compound name's syntax before its hash code is computed. 260 * For a case-insensitive name, for example, the uppercased form of 261 * a name has the same hash code as its lowercased equivalent. 262 * 263 * @return An int representing the hash code of this name. 264 */ 265 public int hashCode() { 266 return impl.hashCode(); 267 } 268 269 /** 270 * Creates a copy of this compound name. 271 * Changes to the components of this compound name won't 272 * affect the new copy and vice versa. 273 * The clone and this compound name share the same syntax. 274 * 275 * @return A non-null copy of this compound name. 276 */ 277 public Object clone() { 278 return (new CompoundName(getAll(), mySyntax)); 279 } 280 281 /** 282 * Compares this CompoundName with the specified Object for order. 283 * Returns a 284 * negative integer, zero, or a positive integer as this Name is less 285 * than, equal to, or greater than the given Object. 286 * <p> 287 * If obj is null or not an instance of CompoundName, ClassCastException 288 * is thrown. 289 * <p> 290 * See equals() for what it means for two compound names to be equal. 291 * If two compound names are equal, 0 is returned. 292 *<p> 293 * Ordering of compound names depend on the syntax of the compound name. 294 * By default, they follow lexicographical rules for string comparison 295 * with the extension that this applies to all the components in the 296 * compound name and that comparison of individual components is 297 * affected by the jndi.syntax.ignorecase and jndi.syntax.trimblanks 298 * properties, identical to how they affect equals(). 299 * If this compound name is "lexicographically" lesser than obj, 300 * a negative number is returned. 301 * If this compound name is "lexicographically" greater than obj, 302 * a positive number is returned. 303 *<p> 304 * Implementation note: Currently the syntax properties of the two compound 305 * names are not compared when checking order. They might be in the future. 306 * @param obj The non-null object to compare against. 307 * @return a negative integer, zero, or a positive integer as this Name 308 * is less than, equal to, or greater than the given Object. 309 * @exception ClassCastException if obj is not a CompoundName. 310 * @see #equals(java.lang.Object) 311 */ 312 public int compareTo(Object obj) { 313 if (!(obj instanceof CompoundName)) { 314 throw new ClassCastException("Not a CompoundName"); 315 } 316 return impl.compareTo(((CompoundName)obj).impl); 317 } 318 319 /** 320 * Retrieves the number of components in this compound name. 321 * 322 * @return The nonnegative number of components in this compound name. 323 */ 324 public int size() { 325 return (impl.size()); 326 } 327 328 /** 329 * Determines whether this compound name is empty. 330 * A compound name is empty if it has zero components. 331 * 332 * @return true if this compound name is empty, false otherwise. 333 */ 334 public boolean isEmpty() { 335 return (impl.isEmpty()); 336 } 337 338 /** 339 * Retrieves the components of this compound name as an enumeration 340 * of strings. 341 * The effects of updates to this compound name on this enumeration 342 * is undefined. 343 * 344 * @return A non-null enumeration of the components of this 345 * compound name. Each element of the enumeration is of class String. 346 */ 347 public Enumeration<String> getAll() { 348 return (impl.getAll()); 349 } 350 351 /** 352 * Retrieves a component of this compound name. 353 * 354 * @param posn The 0-based index of the component to retrieve. 355 * Must be in the range [0,size()). 356 * @return The component at index posn. 357 * @exception ArrayIndexOutOfBoundsException if posn is outside the 358 * specified range. 359 */ 360 public String get(int posn) { 361 return (impl.get(posn)); 362 } 363 364 /** 365 * Creates a compound name whose components consist of a prefix of the 366 * components in this compound name. 367 * The result and this compound name share the same syntax. 368 * Subsequent changes to 369 * this compound name do not affect the name that is returned and 370 * vice versa. 371 * 372 * @param posn The 0-based index of the component at which to stop. 373 * Must be in the range [0,size()]. 374 * @return A compound name consisting of the components at indexes in 375 * the range [0,posn). 376 * @exception ArrayIndexOutOfBoundsException 377 * If posn is outside the specified range. 378 */ 379 public Name getPrefix(int posn) { 380 Enumeration<String> comps = impl.getPrefix(posn); 381 return (new CompoundName(comps, mySyntax)); 382 } 383 384 /** 385 * Creates a compound name whose components consist of a suffix of the 386 * components in this compound name. 387 * The result and this compound name share the same syntax. 388 * Subsequent changes to 389 * this compound name do not affect the name that is returned. 390 * 391 * @param posn The 0-based index of the component at which to start. 392 * Must be in the range [0,size()]. 393 * @return A compound name consisting of the components at indexes in 394 * the range [posn,size()). If posn is equal to 395 * size(), an empty compound name is returned. 396 * @exception ArrayIndexOutOfBoundsException 397 * If posn is outside the specified range. 398 */ 399 public Name getSuffix(int posn) { 400 Enumeration<String> comps = impl.getSuffix(posn); 401 return (new CompoundName(comps, mySyntax)); 402 } 403 404 /** 405 * Determines whether a compound name is a prefix of this compound name. 406 * A compound name 'n' is a prefix if it is equal to 407 * getPrefix(n.size())--in other words, this compound name 408 * starts with 'n'. 409 * If n is null or not a compound name, false is returned. 410 *<p> 411 * Implementation note: Currently the syntax properties of n 412 * are not used when doing the comparison. They might be in the future. 413 * @param n The possibly null compound name to check. 414 * @return true if n is a CompoundName and 415 * is a prefix of this compound name, false otherwise. 416 */ 417 public boolean startsWith(Name n) { 418 if (n instanceof CompoundName) { 419 return (impl.startsWith(n.size(), n.getAll())); 420 } else { 421 return false; 422 } 423 } 424 425 /** 426 * Determines whether a compound name is a suffix of this compound name. 427 * A compound name 'n' is a suffix if it is equal to 428 * getSuffix(size()-n.size())--in other words, this 429 * compound name ends with 'n'. 430 * If n is null or not a compound name, false is returned. 431 *<p> 432 * Implementation note: Currently the syntax properties of n 433 * are not used when doing the comparison. They might be in the future. 434 * @param n The possibly null compound name to check. 435 * @return true if n is a CompoundName and 436 * is a suffix of this compound name, false otherwise. 437 */ 438 public boolean endsWith(Name n) { 439 if (n instanceof CompoundName) { 440 return (impl.endsWith(n.size(), n.getAll())); 441 } else { 442 return false; 443 } 444 } 445 446 /** 447 * Adds the components of a compound name -- in order -- to the end of 448 * this compound name. 449 *<p> 450 * Implementation note: Currently the syntax properties of suffix 451 * is not used or checked. They might be in the future. 452 * @param suffix The non-null components to add. 453 * @return The updated CompoundName, not a new one. Cannot be null. 454 * @exception InvalidNameException If suffix is not a compound name, 455 * or if the addition of the components violates the syntax 456 * of this compound name (e.g. exceeding number of components). 457 */ 458 public Name addAll(Name suffix) throws InvalidNameException { 459 if (suffix instanceof CompoundName) { 460 impl.addAll(suffix.getAll()); 461 return this; 462 } else { 463 throw new InvalidNameException("Not a compound name: " + 464 suffix.toString()); 465 } 466 } 467 468 /** 469 * Adds the components of a compound name -- in order -- at a specified 470 * position within this compound name. 471 * Components of this compound name at or after the index of the first 472 * new component are shifted up (away from index 0) 473 * to accommodate the new components. 474 *<p> 475 * Implementation note: Currently the syntax properties of suffix 476 * is not used or checked. They might be in the future. 477 * 478 * @param n The non-null components to add. 479 * @param posn The index in this name at which to add the new 480 * components. Must be in the range [0,size()]. 481 * @return The updated CompoundName, not a new one. Cannot be null. 482 * @exception ArrayIndexOutOfBoundsException 483 * If posn is outside the specified range. 484 * @exception InvalidNameException If n is not a compound name, 485 * or if the addition of the components violates the syntax 486 * of this compound name (e.g. exceeding number of components). 487 */ 488 public Name addAll(int posn, Name n) throws InvalidNameException { 489 if (n instanceof CompoundName) { 490 impl.addAll(posn, n.getAll()); 491 return this; 492 } else { 493 throw new InvalidNameException("Not a compound name: " + 494 n.toString()); 495 } 496 } 497 498 /** 499 * Adds a single component to the end of this compound name. 500 * 501 * @param comp The non-null component to add. 502 * @return The updated CompoundName, not a new one. Cannot be null. 503 * @exception InvalidNameException If adding comp at end of the name 504 * would violate the compound name's syntax. 505 */ 506 public Name add(String comp) throws InvalidNameException{ 507 impl.add(comp); 508 return this; 509 } 510 511 /** 512 * Adds a single component at a specified position within this 513 * compound name. 514 * Components of this compound name at or after the index of the new 515 * component are shifted up by one (away from index 0) 516 * to accommodate the new component. 517 * 518 * @param comp The non-null component to add. 519 * @param posn The index at which to add the new component. 520 * Must be in the range [0,size()]. 521 * @exception ArrayIndexOutOfBoundsException 522 * If posn is outside the specified range. 523 * @return The updated CompoundName, not a new one. Cannot be null. 524 * @exception InvalidNameException If adding comp at the specified position 525 * would violate the compound name's syntax. 526 */ 527 public Name add(int posn, String comp) throws InvalidNameException{ 528 impl.add(posn, comp); 529 return this; 530 } 531 532 /** 533 * Deletes a component from this compound name. 534 * The component of this compound name at position 'posn' is removed, 535 * and components at indices greater than 'posn' 536 * are shifted down (towards index 0) by one. 537 * 538 * @param posn The index of the component to delete. 539 * Must be in the range [0,size()). 540 * @return The component removed (a String). 541 * @exception ArrayIndexOutOfBoundsException 542 * If posn is outside the specified range (includes case where 543 * compound name is empty). 544 * @exception InvalidNameException If deleting the component 545 * would violate the compound name's syntax. 546 */ 547 public Object remove(int posn) throws InvalidNameException { 548 return impl.remove(posn); 549 } 550 551 /** 552 * Overridden to avoid implementation dependency. 553 * @serialData The syntax {@code Properties}, followed by 554 * the number of components (an {@code int}), and the individual 555 * components (each a {@code String}). 556 */ 557 private void writeObject(java.io.ObjectOutputStream s) 558 throws java.io.IOException { 559 s.writeObject(mySyntax); 560 s.writeInt(size()); 561 Enumeration<String> comps = getAll(); 562 while (comps.hasMoreElements()) { 563 s.writeObject(comps.nextElement()); 564 } 565 } 566 567 /** 568 * Overridden to avoid implementation dependency. 569 */ 570 private void readObject(java.io.ObjectInputStream s) 571 throws java.io.IOException, ClassNotFoundException { 572 mySyntax = (Properties)s.readObject(); 573 impl = new NameImpl(mySyntax); 574 int n = s.readInt(); // number of components 575 try { 576 while (--n >= 0) { 577 add((String)s.readObject()); 578 } 579 } catch (InvalidNameException e) { 580 throw (new java.io.StreamCorruptedException("Invalid name")); 581 } 582 } 583 584 /** 585 * Use serialVersionUID from JNDI 1.1.1 for interoperability 586 */ 587 private static final long serialVersionUID = 3513100557083972036L; 588 589 /* 590 // For testing 591 592 public static void main(String[] args) { 593 Properties dotSyntax = new Properties(); 594 dotSyntax.put("jndi.syntax.direction", "right_to_left"); 595 dotSyntax.put("jndi.syntax.separator", "."); 596 dotSyntax.put("jndi.syntax.ignorecase", "true"); 597 dotSyntax.put("jndi.syntax.escape", "\\"); 598 // dotSyntax.put("jndi.syntax.beginquote", "\""); 599 // dotSyntax.put("jndi.syntax.beginquote2", "'"); 600 601 Name first = null; 602 try { 603 for (int i = 0; i < args.length; i++) { 604 Name name; 605 Enumeration e; 606 System.out.println("Given name: " + args[i]); 607 name = new CompoundName(args[i], dotSyntax); 608 if (first == null) { 609 first = name; 610 } 611 e = name.getComponents(); 612 while (e.hasMoreElements()) { 613 System.out.println("Element: " + e.nextElement()); 614 } 615 System.out.println("Constructed name: " + name.toString()); 616 617 System.out.println("Compare " + first.toString() + " with " 618 + name.toString() + " = " + first.compareTo(name)); 619 } 620 } catch (Exception ne) { 621 ne.printStackTrace(); 622 } 623 } 624 */ 625 }