1 /*
2 * Copyright (c) 1995, 2018, 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;
27
28 import java.io.*;
29 import java.math.BigInteger;
30 import java.util.ArrayList;
31 import java.util.regex.Matcher;
32 import java.util.regex.Pattern;
33 import java.util.stream.Collectors;
34 import java.util.Collections;
35 import java.util.List;
36 import java.util.Optional;
37 import java.util.StringTokenizer;
38
39 import jdk.internal.misc.SharedSecrets;
40 import jdk.internal.reflect.CallerSensitive;
41 import jdk.internal.reflect.Reflection;
42
43 /**
44 * Every Java application has a single instance of class
45 * {@code Runtime} that allows the application to interface with
46 * the environment in which the application is running. The current
47 * runtime can be obtained from the {@code getRuntime} method.
48 * <p>
49 * An application cannot create its own instance of this class.
50 *
51 * @author unascribed
52 * @see java.lang.Runtime#getRuntime()
53 * @since 1.0
54 */
55
56 public class Runtime {
57 private static final Runtime currentRuntime = new Runtime();
58
59 private static Version version;
60
61 /**
62 * Returns the runtime object associated with the current Java application.
63 * Most of the methods of class {@code Runtime} are instance
64 * methods and must be invoked with respect to the current runtime object.
65 *
66 * @return the {@code Runtime} object associated with the current
67 * Java application.
68 */
69 public static Runtime getRuntime() {
70 return currentRuntime;
71 }
72
73 /** Don't let anyone else instantiate this class */
74 private Runtime() {}
75
76 /**
77 * Terminates the currently running Java virtual machine by initiating its
78 * shutdown sequence. This method never returns normally. The argument
79 * serves as a status code; by convention, a nonzero status code indicates
80 * abnormal termination.
81 *
82 * <p> All registered {@link #addShutdownHook shutdown hooks}, if any,
83 * are started in some unspecified order and allowed to run concurrently
84 * until they finish. Once this is done the virtual machine
85 * {@link #halt halts}.
86 *
87 * <p> If this method is invoked after the virtual machine has started
88 * shutdown hooks then if shutdown hooks have already been run and
89 * the status is nonzero then this method halts the virtual machine
90 * with the given status code; otherwise, this method blocks indefinitely
91 * (i.e. if shutdown hooks are being run or if shutdown hooks have already
92 * been run and the status is zero).
93 *
94 * <p> The {@link System#exit(int) System.exit} method is the
95 * conventional and convenient means of invoking this method.
96 *
97 * @param status
98 * Termination status. By convention, a nonzero status code
99 * indicates abnormal termination.
100 *
101 * @throws SecurityException
102 * If a security manager is present and its
103 * {@link SecurityManager#checkExit checkExit} method does not permit
104 * exiting with the specified status
105 *
106 * @see java.lang.SecurityException
107 * @see java.lang.SecurityManager#checkExit(int)
108 * @see #addShutdownHook
109 * @see #removeShutdownHook
110 * @see #halt(int)
111 */
112 public void exit(int status) {
113 SecurityManager security = System.getSecurityManager();
114 if (security != null) {
115 security.checkExit(status);
116 }
117 Shutdown.exit(status);
118 }
119
120 /**
121 * Registers a new virtual-machine shutdown hook.
122 *
123 * <p> The Java virtual machine <i>shuts down</i> in response to two kinds
124 * of events:
125 *
126 * <ul>
127 *
128 * <li> The program <i>exits</i> normally, when the last non-daemon
129 * thread exits or when the {@link #exit exit} (equivalently,
130 * {@link System#exit(int) System.exit}) method is invoked, or
131 *
132 * <li> The virtual machine is <i>terminated</i> in response to a
133 * user interrupt, such as typing {@code ^C}, or a system-wide event,
134 * such as user logoff or system shutdown.
135 *
136 * </ul>
137 *
138 * <p> A <i>shutdown hook</i> is simply an initialized but unstarted
139 * thread. When the virtual machine begins its shutdown sequence it will
140 * start all registered shutdown hooks in some unspecified order and let
141 * them run concurrently. When all the hooks have finished it will then
142 * halt. Note that daemon threads will continue to run during the shutdown
143 * sequence, as will non-daemon threads if shutdown was initiated by
144 * invoking the {@link #exit exit} method.
145 *
146 * <p> Once the shutdown sequence has begun it can be stopped only by
147 * invoking the {@link #halt halt} method, which forcibly
148 * terminates the virtual machine.
149 *
150 * <p> Once the shutdown sequence has begun it is impossible to register a
151 * new shutdown hook or de-register a previously-registered hook.
152 * Attempting either of these operations will cause an
153 * {@link IllegalStateException} to be thrown.
154 *
155 * <p> Shutdown hooks run at a delicate time in the life cycle of a virtual
156 * machine and should therefore be coded defensively. They should, in
157 * particular, be written to be thread-safe and to avoid deadlocks insofar
158 * as possible. They should also not rely blindly upon services that may
159 * have registered their own shutdown hooks and therefore may themselves in
160 * the process of shutting down. Attempts to use other thread-based
161 * services such as the AWT event-dispatch thread, for example, may lead to
162 * deadlocks.
163 *
164 * <p> Shutdown hooks should also finish their work quickly. When a
165 * program invokes {@link #exit exit} the expectation is
166 * that the virtual machine will promptly shut down and exit. When the
167 * virtual machine is terminated due to user logoff or system shutdown the
168 * underlying operating system may only allow a fixed amount of time in
169 * which to shut down and exit. It is therefore inadvisable to attempt any
170 * user interaction or to perform a long-running computation in a shutdown
171 * hook.
172 *
173 * <p> Uncaught exceptions are handled in shutdown hooks just as in any
174 * other thread, by invoking the
175 * {@link ThreadGroup#uncaughtException uncaughtException} method of the
176 * thread's {@link ThreadGroup} object. The default implementation of this
177 * method prints the exception's stack trace to {@link System#err} and
178 * terminates the thread; it does not cause the virtual machine to exit or
179 * halt.
180 *
181 * <p> In rare circumstances the virtual machine may <i>abort</i>, that is,
182 * stop running without shutting down cleanly. This occurs when the
183 * virtual machine is terminated externally, for example with the
184 * {@code SIGKILL} signal on Unix or the {@code TerminateProcess} call on
185 * Microsoft Windows. The virtual machine may also abort if a native
186 * method goes awry by, for example, corrupting internal data structures or
187 * attempting to access nonexistent memory. If the virtual machine aborts
188 * then no guarantee can be made about whether or not any shutdown hooks
189 * will be run.
190 *
191 * @param hook
192 * An initialized but unstarted {@link Thread} object
193 *
194 * @throws IllegalArgumentException
195 * If the specified hook has already been registered,
196 * or if it can be determined that the hook is already running or
197 * has already been run
198 *
199 * @throws IllegalStateException
200 * If the virtual machine is already in the process
201 * of shutting down
202 *
203 * @throws SecurityException
204 * If a security manager is present and it denies
205 * {@link RuntimePermission}("shutdownHooks")
206 *
207 * @see #removeShutdownHook
208 * @see #halt(int)
209 * @see #exit(int)
210 * @since 1.3
211 */
212 public void addShutdownHook(Thread hook) {
213 SecurityManager sm = System.getSecurityManager();
214 if (sm != null) {
215 sm.checkPermission(new RuntimePermission("shutdownHooks"));
216 }
217 ApplicationShutdownHooks.add(hook);
218 }
219
220 /**
221 * De-registers a previously-registered virtual-machine shutdown hook.
222 *
223 * @param hook the hook to remove
224 * @return {@code true} if the specified hook had previously been
225 * registered and was successfully de-registered, {@code false}
226 * otherwise.
227 *
228 * @throws IllegalStateException
229 * If the virtual machine is already in the process of shutting
230 * down
231 *
232 * @throws SecurityException
233 * If a security manager is present and it denies
234 * {@link RuntimePermission}("shutdownHooks")
235 *
236 * @see #addShutdownHook
237 * @see #exit(int)
238 * @since 1.3
239 */
240 public boolean removeShutdownHook(Thread hook) {
241 SecurityManager sm = System.getSecurityManager();
242 if (sm != null) {
243 sm.checkPermission(new RuntimePermission("shutdownHooks"));
244 }
245 return ApplicationShutdownHooks.remove(hook);
246 }
247
248 /**
249 * Forcibly terminates the currently running Java virtual machine. This
250 * method never returns normally.
251 *
252 * <p> This method should be used with extreme caution. Unlike the
253 * {@link #exit exit} method, this method does not cause shutdown
254 * hooks to be started. If the shutdown sequence has already been
255 * initiated then this method does not wait for any running
256 * shutdown hooks to finish their work.
257 *
258 * @param status
259 * Termination status. By convention, a nonzero status code
260 * indicates abnormal termination. If the {@link Runtime#exit exit}
261 * (equivalently, {@link System#exit(int) System.exit}) method
262 * has already been invoked then this status code
263 * will override the status code passed to that method.
264 *
265 * @throws SecurityException
266 * If a security manager is present and its
267 * {@link SecurityManager#checkExit checkExit} method
268 * does not permit an exit with the specified status
269 *
270 * @see #exit
271 * @see #addShutdownHook
272 * @see #removeShutdownHook
273 * @since 1.3
274 */
275 public void halt(int status) {
276 SecurityManager sm = System.getSecurityManager();
277 if (sm != null) {
278 sm.checkExit(status);
279 }
280 Shutdown.halt(status);
281 }
282
283 /**
284 * Executes the specified string command in a separate process.
285 *
286 * <p>This is a convenience method. An invocation of the form
287 * {@code exec(command)}
288 * behaves in exactly the same way as the invocation
289 * {@link #exec(String, String[], File) exec}{@code (command, null, null)}.
290 *
291 * @param command a specified system command.
292 *
293 * @return A new {@link Process} object for managing the subprocess
294 *
295 * @throws SecurityException
296 * If a security manager exists and its
297 * {@link SecurityManager#checkExec checkExec}
298 * method doesn't allow creation of the subprocess
299 *
300 * @throws IOException
301 * If an I/O error occurs
302 *
303 * @throws NullPointerException
304 * If {@code command} is {@code null}
305 *
306 * @throws IllegalArgumentException
307 * If {@code command} is empty
308 *
309 * @see #exec(String[], String[], File)
310 * @see ProcessBuilder
311 */
312 public Process exec(String command) throws IOException {
313 return exec(command, null, null);
314 }
315
316 /**
317 * Executes the specified string command in a separate process with the
318 * specified environment.
319 *
320 * <p>This is a convenience method. An invocation of the form
321 * {@code exec(command, envp)}
322 * behaves in exactly the same way as the invocation
323 * {@link #exec(String, String[], File) exec}{@code (command, envp, null)}.
324 *
325 * @param command a specified system command.
326 *
327 * @param envp array of strings, each element of which
328 * has environment variable settings in the format
329 * <i>name</i>=<i>value</i>, or
330 * {@code null} if the subprocess should inherit
331 * the environment of the current process.
332 *
333 * @return A new {@link Process} object for managing the subprocess
334 *
335 * @throws SecurityException
336 * If a security manager exists and its
337 * {@link SecurityManager#checkExec checkExec}
338 * method doesn't allow creation of the subprocess
339 *
340 * @throws IOException
341 * If an I/O error occurs
342 *
343 * @throws NullPointerException
344 * If {@code command} is {@code null},
345 * or one of the elements of {@code envp} is {@code null}
346 *
347 * @throws IllegalArgumentException
348 * If {@code command} is empty
349 *
350 * @see #exec(String[], String[], File)
351 * @see ProcessBuilder
352 */
353 public Process exec(String command, String[] envp) throws IOException {
354 return exec(command, envp, null);
355 }
356
357 /**
358 * Executes the specified string command in a separate process with the
359 * specified environment and working directory.
360 *
361 * <p>This is a convenience method. An invocation of the form
362 * {@code exec(command, envp, dir)}
363 * behaves in exactly the same way as the invocation
364 * {@link #exec(String[], String[], File) exec}{@code (cmdarray, envp, dir)},
365 * where {@code cmdarray} is an array of all the tokens in
366 * {@code command}.
367 *
368 * <p>More precisely, the {@code command} string is broken
369 * into tokens using a {@link StringTokenizer} created by the call
370 * {@code new {@link StringTokenizer}(command)} with no
371 * further modification of the character categories. The tokens
372 * produced by the tokenizer are then placed in the new string
373 * array {@code cmdarray}, in the same order.
374 *
375 * @param command a specified system command.
376 *
377 * @param envp array of strings, each element of which
378 * has environment variable settings in the format
379 * <i>name</i>=<i>value</i>, or
380 * {@code null} if the subprocess should inherit
381 * the environment of the current process.
382 *
383 * @param dir the working directory of the subprocess, or
384 * {@code null} if the subprocess should inherit
385 * the working directory of the current process.
386 *
387 * @return A new {@link Process} object for managing the subprocess
388 *
389 * @throws SecurityException
390 * If a security manager exists and its
391 * {@link SecurityManager#checkExec checkExec}
392 * method doesn't allow creation of the subprocess
393 *
394 * @throws IOException
395 * If an I/O error occurs
396 *
397 * @throws NullPointerException
398 * If {@code command} is {@code null},
399 * or one of the elements of {@code envp} is {@code null}
400 *
401 * @throws IllegalArgumentException
402 * If {@code command} is empty
403 *
404 * @see ProcessBuilder
405 * @since 1.3
406 */
407 public Process exec(String command, String[] envp, File dir)
408 throws IOException {
409 if (command.length() == 0)
410 throw new IllegalArgumentException("Empty command");
411
412 StringTokenizer st = new StringTokenizer(command);
413 String[] cmdarray = new String[st.countTokens()];
414 for (int i = 0; st.hasMoreTokens(); i++)
415 cmdarray[i] = st.nextToken();
416 return exec(cmdarray, envp, dir);
417 }
418
419 /**
420 * Executes the specified command and arguments in a separate process.
421 *
422 * <p>This is a convenience method. An invocation of the form
423 * {@code exec(cmdarray)}
424 * behaves in exactly the same way as the invocation
425 * {@link #exec(String[], String[], File) exec}{@code (cmdarray, null, null)}.
426 *
427 * @param cmdarray array containing the command to call and
428 * its arguments.
429 *
430 * @return A new {@link Process} object for managing the subprocess
431 *
432 * @throws SecurityException
433 * If a security manager exists and its
434 * {@link SecurityManager#checkExec checkExec}
435 * method doesn't allow creation of the subprocess
436 *
437 * @throws IOException
438 * If an I/O error occurs
439 *
440 * @throws NullPointerException
441 * If {@code cmdarray} is {@code null},
442 * or one of the elements of {@code cmdarray} is {@code null}
443 *
444 * @throws IndexOutOfBoundsException
445 * If {@code cmdarray} is an empty array
446 * (has length {@code 0})
447 *
448 * @see ProcessBuilder
449 */
450 public Process exec(String cmdarray[]) throws IOException {
451 return exec(cmdarray, null, null);
452 }
453
454 /**
455 * Executes the specified command and arguments in a separate process
456 * with the specified environment.
457 *
458 * <p>This is a convenience method. An invocation of the form
459 * {@code exec(cmdarray, envp)}
460 * behaves in exactly the same way as the invocation
461 * {@link #exec(String[], String[], File) exec}{@code (cmdarray, envp, null)}.
462 *
463 * @param cmdarray array containing the command to call and
464 * its arguments.
465 *
466 * @param envp array of strings, each element of which
467 * has environment variable settings in the format
468 * <i>name</i>=<i>value</i>, or
469 * {@code null} if the subprocess should inherit
470 * the environment of the current process.
471 *
472 * @return A new {@link Process} object for managing the subprocess
473 *
474 * @throws SecurityException
475 * If a security manager exists and its
476 * {@link SecurityManager#checkExec checkExec}
477 * method doesn't allow creation of the subprocess
478 *
479 * @throws IOException
480 * If an I/O error occurs
481 *
482 * @throws NullPointerException
483 * If {@code cmdarray} is {@code null},
484 * or one of the elements of {@code cmdarray} is {@code null},
485 * or one of the elements of {@code envp} is {@code null}
486 *
487 * @throws IndexOutOfBoundsException
488 * If {@code cmdarray} is an empty array
489 * (has length {@code 0})
490 *
491 * @see ProcessBuilder
492 */
493 public Process exec(String[] cmdarray, String[] envp) throws IOException {
494 return exec(cmdarray, envp, null);
495 }
496
497
498 /**
499 * Executes the specified command and arguments in a separate process with
500 * the specified environment and working directory.
501 *
502 * <p>Given an array of strings {@code cmdarray}, representing the
503 * tokens of a command line, and an array of strings {@code envp},
504 * representing "environment" variable settings, this method creates
505 * a new process in which to execute the specified command.
506 *
507 * <p>This method checks that {@code cmdarray} is a valid operating
508 * system command. Which commands are valid is system-dependent,
509 * but at the very least the command must be a non-empty list of
510 * non-null strings.
511 *
512 * <p>If {@code envp} is {@code null}, the subprocess inherits the
513 * environment settings of the current process.
514 *
515 * <p>A minimal set of system dependent environment variables may
516 * be required to start a process on some operating systems.
517 * As a result, the subprocess may inherit additional environment variable
518 * settings beyond those in the specified environment.
519 *
520 * <p>{@link ProcessBuilder#start()} is now the preferred way to
521 * start a process with a modified environment.
522 *
523 * <p>The working directory of the new subprocess is specified by {@code dir}.
524 * If {@code dir} is {@code null}, the subprocess inherits the
525 * current working directory of the current process.
526 *
527 * <p>If a security manager exists, its
528 * {@link SecurityManager#checkExec checkExec}
529 * method is invoked with the first component of the array
530 * {@code cmdarray} as its argument. This may result in a
531 * {@link SecurityException} being thrown.
532 *
533 * <p>Starting an operating system process is highly system-dependent.
534 * Among the many things that can go wrong are:
535 * <ul>
536 * <li>The operating system program file was not found.
537 * <li>Access to the program file was denied.
538 * <li>The working directory does not exist.
539 * </ul>
540 *
541 * <p>In such cases an exception will be thrown. The exact nature
542 * of the exception is system-dependent, but it will always be a
543 * subclass of {@link IOException}.
544 *
545 * <p>If the operating system does not support the creation of
546 * processes, an {@link UnsupportedOperationException} will be thrown.
547 *
548 *
549 * @param cmdarray array containing the command to call and
550 * its arguments.
551 *
552 * @param envp array of strings, each element of which
553 * has environment variable settings in the format
554 * <i>name</i>=<i>value</i>, or
555 * {@code null} if the subprocess should inherit
556 * the environment of the current process.
557 *
558 * @param dir the working directory of the subprocess, or
559 * {@code null} if the subprocess should inherit
560 * the working directory of the current process.
561 *
562 * @return A new {@link Process} object for managing the subprocess
563 *
564 * @throws SecurityException
565 * If a security manager exists and its
566 * {@link SecurityManager#checkExec checkExec}
567 * method doesn't allow creation of the subprocess
568 *
569 * @throws UnsupportedOperationException
570 * If the operating system does not support the creation of processes.
571 *
572 * @throws IOException
573 * If an I/O error occurs
574 *
575 * @throws NullPointerException
576 * If {@code cmdarray} is {@code null},
577 * or one of the elements of {@code cmdarray} is {@code null},
578 * or one of the elements of {@code envp} is {@code null}
579 *
580 * @throws IndexOutOfBoundsException
581 * If {@code cmdarray} is an empty array
582 * (has length {@code 0})
583 *
584 * @see ProcessBuilder
585 * @since 1.3
586 */
587 public Process exec(String[] cmdarray, String[] envp, File dir)
588 throws IOException {
589 return new ProcessBuilder(cmdarray)
590 .environment(envp)
591 .directory(dir)
592 .start();
593 }
594
595 /**
596 * Returns the number of processors available to the Java virtual machine.
597 *
598 * <p> This value may change during a particular invocation of the virtual
599 * machine. Applications that are sensitive to the number of available
600 * processors should therefore occasionally poll this property and adjust
601 * their resource usage appropriately. </p>
602 *
603 * @return the maximum number of processors available to the virtual
604 * machine; never smaller than one
605 * @since 1.4
606 */
607 public native int availableProcessors();
608
609 /**
610 * Returns the amount of free memory in the Java Virtual Machine.
611 * Calling the
612 * {@code gc} method may result in increasing the value returned
613 * by {@code freeMemory.}
614 *
615 * @return an approximation to the total amount of memory currently
616 * available for future allocated objects, measured in bytes.
617 */
618 public native long freeMemory();
619
620 /**
621 * Returns the total amount of memory in the Java virtual machine.
622 * The value returned by this method may vary over time, depending on
623 * the host environment.
624 * <p>
625 * Note that the amount of memory required to hold an object of any
626 * given type may be implementation-dependent.
627 *
628 * @return the total amount of memory currently available for current
629 * and future objects, measured in bytes.
630 */
631 public native long totalMemory();
632
633 /**
634 * Returns the maximum amount of memory that the Java virtual machine
635 * will attempt to use. If there is no inherent limit then the value
636 * {@link java.lang.Long#MAX_VALUE} will be returned.
637 *
638 * @return the maximum amount of memory that the virtual machine will
639 * attempt to use, measured in bytes
640 * @since 1.4
641 */
642 public native long maxMemory();
643
644 /**
645 * Runs the garbage collector.
646 * Calling this method suggests that the Java virtual machine expend
647 * effort toward recycling unused objects in order to make the memory
648 * they currently occupy available for quick reuse. When control
649 * returns from the method call, the virtual machine has made
650 * its best effort to recycle all discarded objects.
651 * <p>
652 * The name {@code gc} stands for "garbage
653 * collector". The virtual machine performs this recycling
654 * process automatically as needed, in a separate thread, even if the
655 * {@code gc} method is not invoked explicitly.
656 * <p>
657 * The method {@link System#gc()} is the conventional and convenient
658 * means of invoking this method.
659 */
660 public native void gc();
661
662 /**
663 * Runs the finalization methods of any objects pending finalization.
664 * Calling this method suggests that the Java virtual machine expend
665 * effort toward running the {@code finalize} methods of objects
666 * that have been found to be discarded but whose {@code finalize}
667 * methods have not yet been run. When control returns from the
668 * method call, the virtual machine has made a best effort to
669 * complete all outstanding finalizations.
670 * <p>
671 * The virtual machine performs the finalization process
672 * automatically as needed, in a separate thread, if the
673 * {@code runFinalization} method is not invoked explicitly.
674 * <p>
675 * The method {@link System#runFinalization()} is the conventional
676 * and convenient means of invoking this method.
677 *
678 * @see java.lang.Object#finalize()
679 */
680 public void runFinalization() {
681 SharedSecrets.getJavaLangRefAccess().runFinalization();
682 }
683
684 /**
685 * Not implemented, does nothing.
686 *
687 * @deprecated
688 * This method was intended to control instruction tracing.
689 * It has been superseded by JVM-specific tracing mechanisms.
690 * This method is subject to removal in a future version of Java SE.
691 *
692 * @param on ignored
693 */
694 @Deprecated(since="9", forRemoval=true)
695 public void traceInstructions(boolean on) { }
696
697 /**
698 * Not implemented, does nothing.
699 *
700 * @deprecated
701 * This method was intended to control method call tracing.
702 * It has been superseded by JVM-specific tracing mechanisms.
703 * This method is subject to removal in a future version of Java SE.
704 *
705 * @param on ignored
706 */
707 @Deprecated(since="9", forRemoval=true)
708 public void traceMethodCalls(boolean on) { }
709
710 /**
711 * Loads the native library specified by the filename argument. The filename
712 * argument must be an absolute path name.
713 * (for example
714 * {@code Runtime.getRuntime().load("/home/avh/lib/libX11.so");}).
715 *
716 * If the filename argument, when stripped of any platform-specific library
717 * prefix, path, and file extension, indicates a library whose name is,
718 * for example, L, and a native library called L is statically linked
719 * with the VM, then the JNI_OnLoad_L function exported by the library
720 * is invoked rather than attempting to load a dynamic library.
721 * A filename matching the argument does not have to exist in the file
722 * system.
723 * See the <a href="{@docRoot}/../specs/jni/index.html"> JNI Specification</a>
724 * for more details.
725 *
726 * Otherwise, the filename argument is mapped to a native library image in
727 * an implementation-dependent manner.
728 * <p>
729 * First, if there is a security manager, its {@code checkLink}
730 * method is called with the {@code filename} as its argument.
731 * This may result in a security exception.
732 * <p>
733 * This is similar to the method {@link #loadLibrary(String)}, but it
734 * accepts a general file name as an argument rather than just a library
735 * name, allowing any file of native code to be loaded.
736 * <p>
737 * The method {@link System#load(String)} is the conventional and
738 * convenient means of invoking this method.
739 *
740 * @param filename the file to load.
741 * @exception SecurityException if a security manager exists and its
742 * {@code checkLink} method doesn't allow
743 * loading of the specified dynamic library
744 * @exception UnsatisfiedLinkError if either the filename is not an
745 * absolute path name, the native library is not statically
746 * linked with the VM, or the library cannot be mapped to
747 * a native library image by the host system.
748 * @exception NullPointerException if {@code filename} is
749 * {@code null}
750 * @see java.lang.Runtime#getRuntime()
751 * @see java.lang.SecurityException
752 * @see java.lang.SecurityManager#checkLink(java.lang.String)
753 */
754 @CallerSensitive
755 public void load(String filename) {
756 load0(Reflection.getCallerClass(), filename);
757 }
758
759 synchronized void load0(Class<?> fromClass, String filename) {
760 SecurityManager security = System.getSecurityManager();
761 if (security != null) {
762 security.checkLink(filename);
763 }
764 if (!(new File(filename).isAbsolute())) {
765 throw new UnsatisfiedLinkError(
766 "Expecting an absolute path of the library: " + filename);
767 }
768 ClassLoader.loadLibrary(fromClass, filename, true);
769 }
770
771 /**
772 * Loads the native library specified by the {@code libname}
773 * argument. The {@code libname} argument must not contain any platform
774 * specific prefix, file extension or path. If a native library
775 * called {@code libname} is statically linked with the VM, then the
776 * JNI_OnLoad_{@code libname} function exported by the library is invoked.
777 * See the <a href="{@docRoot}/../specs/jni/index.html"> JNI Specification</a>
778 * for more details.
779 *
780 * Otherwise, the libname argument is loaded from a system library
781 * location and mapped to a native library image in an implementation-
782 * dependent manner.
783 * <p>
784 * First, if there is a security manager, its {@code checkLink}
785 * method is called with the {@code libname} as its argument.
786 * This may result in a security exception.
787 * <p>
788 * The method {@link System#loadLibrary(String)} is the conventional
789 * and convenient means of invoking this method. If native
790 * methods are to be used in the implementation of a class, a standard
791 * strategy is to put the native code in a library file (call it
792 * {@code LibFile}) and then to put a static initializer:
793 * <blockquote><pre>
794 * static { System.loadLibrary("LibFile"); }
795 * </pre></blockquote>
796 * within the class declaration. When the class is loaded and
797 * initialized, the necessary native code implementation for the native
798 * methods will then be loaded as well.
799 * <p>
800 * If this method is called more than once with the same library
801 * name, the second and subsequent calls are ignored.
802 *
803 * @param libname the name of the library.
804 * @exception SecurityException if a security manager exists and its
805 * {@code checkLink} method doesn't allow
806 * loading of the specified dynamic library
807 * @exception UnsatisfiedLinkError if either the libname argument
808 * contains a file path, the native library is not statically
809 * linked with the VM, or the library cannot be mapped to a
810 * native library image by the host system.
811 * @exception NullPointerException if {@code libname} is
812 * {@code null}
813 * @see java.lang.SecurityException
814 * @see java.lang.SecurityManager#checkLink(java.lang.String)
815 */
816 @CallerSensitive
817 public void loadLibrary(String libname) {
818 loadLibrary0(Reflection.getCallerClass(), libname);
819 }
820
821 synchronized void loadLibrary0(Class<?> fromClass, String libname) {
822 SecurityManager security = System.getSecurityManager();
823 if (security != null) {
824 security.checkLink(libname);
825 }
826 if (libname.indexOf((int)File.separatorChar) != -1) {
827 throw new UnsatisfiedLinkError(
828 "Directory separator should not appear in library name: " + libname);
829 }
830 ClassLoader.loadLibrary(fromClass, libname, false);
831 }
832
833 /**
834 * Returns the version of the Java Runtime Environment as a {@link Version}.
835 *
836 * @return the {@link Version} of the Java Runtime Environment
837 *
838 * @since 9
839 */
840 public static Version version() {
841 if (version == null) {
842 version = new Version(VersionProps.versionNumbers(),
843 VersionProps.pre(), VersionProps.build(),
844 VersionProps.optional());
845 }
846 return version;
847 }
848
849 /**
850 * A representation of a version string for an implementation of the
851 * Java SE Platform. A version string consists of a version number
852 * optionally followed by pre-release and build information.
853 *
854 * <h2><a id="verNum">Version numbers</a></h2>
855 *
856 * <p> A <em>version number</em>, {@code $VNUM}, is a non-empty sequence of
857 * elements separated by period characters (U+002E). An element is either
858 * zero, or an unsigned integer numeral without leading zeros. The final
859 * element in a version number must not be zero. When an element is
860 * incremented, all subsequent elements are removed. The format is: </p>
861 *
862 * <blockquote><pre>
863 * [1-9][0-9]*((\.0)*\.[1-9][0-9]*)*
864 * </pre></blockquote>
865 *
866 * <p> The sequence may be of arbitrary length but the first four elements
867 * are assigned specific meanings, as follows:</p>
868 *
869 * <blockquote><pre>
870 * $FEATURE.$INTERIM.$UPDATE.$PATCH
871 * </pre></blockquote>
872 *
873 * <ul>
874 *
875 * <li><p> <a id="FEATURE">{@code $FEATURE}</a> — The
876 * feature-release counter, incremented for every feature release
877 * regardless of release content. Features may be added in a feature
878 * release; they may also be removed, if advance notice was given at least
879 * one feature release ahead of time. Incompatible changes may be made
880 * when justified. </p></li>
881 *
882 * <li><p> <a id="INTERIM">{@code $INTERIM}</a> — The
883 * interim-release counter, incremented for non-feature releases that
884 * contain compatible bug fixes and enhancements but no incompatible
885 * changes, no feature removals, and no changes to standard APIs.
886 * </p></li>
887 *
888 * <li><p> <a id="UPDATE">{@code $UPDATE}</a> — The update-release
889 * counter, incremented for compatible update releases that fix security
890 * issues, regressions, and bugs in newer features. </p></li>
891 *
892 * <li><p> <a id="PATCH">{@code $PATCH}</a> — The emergency
893 * patch-release counter, incremented only when it's necessary to produce
894 * an emergency release to fix a critical issue. </p></li>
895 *
896 * </ul>
897 *
898 * <p> The fifth and later elements of a version number are free for use by
899 * platform implementors, to identify implementor-specific patch
900 * releases. </p>
901 *
902 * <p> A version number never has trailing zero elements. If an element
903 * and all those that follow it logically have the value zero then all of
904 * them are omitted. </p>
905 *
906 * <p> The sequence of numerals in a version number is compared to another
907 * such sequence in numerical, pointwise fashion; <em>e.g.</em>, {@code
908 * 10.0.4} is less than {@code 10.1.2}. If one sequence is shorter than
909 * another then the missing elements of the shorter sequence are considered
910 * to be less than the corresponding elements of the longer sequence;
911 * <em>e.g.</em>, {@code 10.0.2} is less than {@code 10.0.2.1}. </p>
912 *
913 * <h2><a id="verStr">Version strings</a></h2>
914 *
915 * <p> A <em>version string</em>, {@code $VSTR}, is a version number {@code
916 * $VNUM}, as described above, optionally followed by pre-release and build
917 * information, in one of the following formats: </p>
918 *
919 * <blockquote><pre>
920 * $VNUM(-$PRE)?\+$BUILD(-$OPT)?
921 * $VNUM-$PRE(-$OPT)?
922 * $VNUM(+-$OPT)?
923 * </pre></blockquote>
924 *
925 * <p> where: </p>
926 *
927 * <ul>
928 *
929 * <li><p> <a id="pre">{@code $PRE}</a>, matching {@code ([a-zA-Z0-9]+)}
930 * — A pre-release identifier. Typically {@code ea}, for a
931 * potentially unstable early-access release under active development, or
932 * {@code internal}, for an internal developer build. </p></li>
933 *
934 * <li><p> <a id="build">{@code $BUILD}</a>, matching {@code
935 * (0|[1-9][0-9]*)} — The build number, incremented for each promoted
936 * build. {@code $BUILD} is reset to {@code 1} when any portion of {@code
937 * $VNUM} is incremented. </p></li>
938 *
939 * <li><p> <a id="opt">{@code $OPT}</a>, matching {@code ([-a-zA-Z0-9.]+)}
940 * — Additional build information, if desired. In the case of an
941 * {@code internal} build this will often contain the date and time of the
942 * build. </p></li>
943 *
944 * </ul>
945 *
946 * <p> A version string {@code 10-ea} matches {@code $VNUM = "10"} and
947 * {@code $PRE = "ea"}. The version string {@code 10+-ea} matches
948 * {@code $VNUM = "10"} and {@code $OPT = "ea"}. </p>
949 *
950 * <p> When comparing two version strings, the value of {@code $OPT}, if
951 * present, may or may not be significant depending on the chosen
952 * comparison method. The comparison methods {@link #compareTo(Version)
953 * compareTo()} and {@link #compareToIgnoreOptional(Version)
954 * compareToIgnoreOptional()} should be used consistently with the
955 * corresponding methods {@link #equals(Object) equals()} and {@link
956 * #equalsIgnoreOptional(Object) equalsIgnoreOptional()}. </p>
957 *
958 * <p> A <em>short version string</em>, {@code $SVSTR}, often useful in
959 * less formal contexts, is a version number optionally followed by a
960 * pre-release identifier:</p>
961 *
962 * <blockquote><pre>
963 * $VNUM(-$PRE)?
964 * </pre></blockquote>
965 *
966 * <p>This is a <a href="./doc-files/ValueBased.html">value-based</a>
967 * class; use of identity-sensitive operations (including reference equality
968 * ({@code ==}), identity hash code, or synchronization) on instances of
969 * {@code Version} may have unpredictable results and should be avoided.
970 * </p>
971 *
972 * @since 9
973 */
974 public static final class Version
975 implements Comparable<Version>
976 {
977 private final List<Integer> version;
978 private final Optional<String> pre;
979 private final Optional<Integer> build;
980 private final Optional<String> optional;
981
982 /*
983 * List of version number components passed to this constructor MUST
984 * be at least unmodifiable (ideally immutable). In the case on an
985 * unmodifiable list, the caller MUST hand the list over to this
986 * constructor and never change the underlying list.
987 */
988 private Version(List<Integer> unmodifiableListOfVersions,
989 Optional<String> pre,
990 Optional<Integer> build,
991 Optional<String> optional)
992 {
993 this.version = unmodifiableListOfVersions;
994 this.pre = pre;
995 this.build = build;
996 this.optional = optional;
997 }
998
999 /**
1000 * Parses the given string as a valid
1001 * <a href="#verStr">version string</a> containing a
1002 * <a href="#verNum">version number</a> followed by pre-release and
1003 * build information.
1004 *
1005 * @param s
1006 * A string to interpret as a version
1007 *
1008 * @throws IllegalArgumentException
1009 * If the given string cannot be interpreted as a valid
1010 * version
1011 *
1012 * @throws NullPointerException
1013 * If the given string is {@code null}
1014 *
1015 * @throws NumberFormatException
1016 * If an element of the version number or the build number
1017 * cannot be represented as an {@link Integer}
1018 *
1019 * @return The Version of the given string
1020 */
1021 public static Version parse(String s) {
1022 if (s == null)
1023 throw new NullPointerException();
1024
1025 // Shortcut to avoid initializing VersionPattern when creating
1026 // feature-version constants during startup
1027 if (isSimpleNumber(s)) {
1028 return new Version(List.of(Integer.parseInt(s)),
1029 Optional.empty(), Optional.empty(), Optional.empty());
1030 }
1031 Matcher m = VersionPattern.VSTR_PATTERN.matcher(s);
1032 if (!m.matches())
1033 throw new IllegalArgumentException("Invalid version string: '"
1034 + s + "'");
1035
1036 // $VNUM is a dot-separated list of integers of arbitrary length
1037 String[] split = m.group(VersionPattern.VNUM_GROUP).split("\\.");
1038 Integer[] version = new Integer[split.length];
1039 for (int i = 0; i < split.length; i++) {
1040 version[i] = Integer.parseInt(split[i]);
1041 }
1042
1043 Optional<String> pre = Optional.ofNullable(
1044 m.group(VersionPattern.PRE_GROUP));
1045
1046 String b = m.group(VersionPattern.BUILD_GROUP);
1047 // $BUILD is an integer
1048 Optional<Integer> build = (b == null)
1049 ? Optional.empty()
1050 : Optional.of(Integer.parseInt(b));
1051
1052 Optional<String> optional = Optional.ofNullable(
1053 m.group(VersionPattern.OPT_GROUP));
1054
1055 // empty '+'
1056 if (!build.isPresent()) {
1057 if (m.group(VersionPattern.PLUS_GROUP) != null) {
1058 if (optional.isPresent()) {
1059 if (pre.isPresent())
1060 throw new IllegalArgumentException("'+' found with"
1061 + " pre-release and optional components:'" + s
1062 + "'");
1063 } else {
1064 throw new IllegalArgumentException("'+' found with neither"
1065 + " build or optional components: '" + s + "'");
1066 }
1067 } else {
1068 if (optional.isPresent() && !pre.isPresent()) {
1069 throw new IllegalArgumentException("optional component"
1070 + " must be preceeded by a pre-release component"
1071 + " or '+': '" + s + "'");
1072 }
1073 }
1074 }
1075 return new Version(List.of(version), pre, build, optional);
1076 }
1077
1078 private static boolean isSimpleNumber(String s) {
1079 for (int i = 0; i < s.length(); i++) {
1080 char c = s.charAt(i);
1081 char lowerBound = (i > 0) ? '0' : '1';
1082 if (c < lowerBound || c > '9') {
1083 return false;
1084 }
1085 }
1086 return true;
1087 }
1088
1089 /**
1090 * Returns the value of the <a href="#FEATURE">feature</a> element of
1091 * the version number.
1092 *
1093 * @return The value of the feature element
1094 *
1095 * @since 10
1096 */
1097 public int feature() {
1098 return version.get(0);
1099 }
1100
1101 /**
1102 * Returns the value of the <a href="#INTERIM">interim</a> element of
1103 * the version number, or zero if it is absent.
1104 *
1105 * @return The value of the interim element, or zero
1106 *
1107 * @since 10
1108 */
1109 public int interim() {
1110 return (version.size() > 1 ? version.get(1) : 0);
1111 }
1112
1113 /**
1114 * Returns the value of the <a href="#UPDATE">update</a> element of the
1115 * version number, or zero if it is absent.
1116 *
1117 * @return The value of the update element, or zero
1118 *
1119 * @since 10
1120 */
1121 public int update() {
1122 return (version.size() > 2 ? version.get(2) : 0);
1123 }
1124
1125 /**
1126 * Returns the value of the <a href="#PATCH">patch</a> element of the
1127 * version number, or zero if it is absent.
1128 *
1129 * @return The value of the patch element, or zero
1130 *
1131 * @since 10
1132 */
1133 public int patch() {
1134 return (version.size() > 3 ? version.get(3) : 0);
1135 }
1136
1137 /**
1138 * Returns the value of the major element of the version number.
1139 *
1140 * @deprecated As of Java SE 10, the first element of a version
1141 * number is not the major-release number but the feature-release
1142 * counter, incremented for every time-based release. Use the {@link
1143 * #feature()} method in preference to this method. For compatibility,
1144 * this method returns the value of the <a href="FEATURE">feature</a>
1145 * element.
1146 *
1147 * @return The value of the feature element
1148 */
1149 @Deprecated(since = "10")
1150 public int major() {
1151 return feature();
1152 }
1153
1154 /**
1155 * Returns the value of the minor element of the version number, or
1156 * zero if it is absent.
1157 *
1158 * @deprecated As of Java SE 10, the second element of a version
1159 * number is not the minor-release number but the interim-release
1160 * counter, incremented for every interim release. Use the {@link
1161 * #interim()} method in preference to this method. For compatibility,
1162 * this method returns the value of the <a href="INTERIM">interim</a>
1163 * element, or zero if it is absent.
1164 *
1165 * @return The value of the interim element, or zero
1166 */
1167 @Deprecated(since = "10")
1168 public int minor() {
1169 return interim();
1170 }
1171
1172 /**
1173 * Returns the value of the security element of the version number, or
1174 * zero if it is absent.
1175 *
1176 * @deprecated As of Java SE 10, the third element of a version
1177 * number is not the security level but the update-release counter,
1178 * incremented for every update release. Use the {@link #update()}
1179 * method in preference to this method. For compatibility, this method
1180 * returns the value of the <a href="UPDATE">update</a> element, or
1181 * zero if it is absent.
1182 *
1183 * @return The value of the update element, or zero
1184 */
1185 @Deprecated(since = "10")
1186 public int security() {
1187 return update();
1188 }
1189
1190 /**
1191 * Returns an unmodifiable {@link java.util.List List} of the integers
1192 * represented in the <a href="#verNum">version number</a>. The {@code
1193 * List} always contains at least one element corresponding to the <a
1194 * href="#feature">feature version number</a>.
1195 *
1196 * @return An unmodifiable list of the integers
1197 * represented in the version number
1198 */
1199 public List<Integer> version() {
1200 return version;
1201 }
1202
1203 /**
1204 * Returns the optional <a href="#pre">pre-release</a> information.
1205 *
1206 * @return The optional pre-release information as a String
1207 */
1208 public Optional<String> pre() {
1209 return pre;
1210 }
1211
1212 /**
1213 * Returns the <a href="#build">build number</a>.
1214 *
1215 * @return The optional build number.
1216 */
1217 public Optional<Integer> build() {
1218 return build;
1219 }
1220
1221 /**
1222 * Returns <a href="#opt">optional</a> additional identifying build
1223 * information.
1224 *
1225 * @return Additional build information as a String
1226 */
1227 public Optional<String> optional() {
1228 return optional;
1229 }
1230
1231 /**
1232 * Compares this version to another.
1233 *
1234 * <p> Each of the components in the <a href="#verStr">version</a> is
1235 * compared in the following order of precedence: version numbers,
1236 * pre-release identifiers, build numbers, optional build information.
1237 * </p>
1238 *
1239 * <p> Comparison begins by examining the sequence of version numbers.
1240 * If one sequence is shorter than another, then the missing elements
1241 * of the shorter sequence are considered to be less than the
1242 * corresponding elements of the longer sequence. </p>
1243 *
1244 * <p> A version with a pre-release identifier is always considered to
1245 * be less than a version without one. Pre-release identifiers are
1246 * compared numerically when they consist only of digits, and
1247 * lexicographically otherwise. Numeric identifiers are considered to
1248 * be less than non-numeric identifiers. </p>
1249 *
1250 * <p> A version without a build number is always less than one with a
1251 * build number; otherwise build numbers are compared numerically. </p>
1252 *
1253 * <p> The optional build information is compared lexicographically.
1254 * During this comparison, a version with optional build information is
1255 * considered to be greater than a version without one. </p>
1256 *
1257 * @param obj
1258 * The object to be compared
1259 *
1260 * @return A negative integer, zero, or a positive integer if this
1261 * {@code Version} is less than, equal to, or greater than the
1262 * given {@code Version}
1263 *
1264 * @throws NullPointerException
1265 * If the given object is {@code null}
1266 */
1267 @Override
1268 public int compareTo(Version obj) {
1269 return compare(obj, false);
1270 }
1271
1272 /**
1273 * Compares this version to another disregarding optional build
1274 * information.
1275 *
1276 * <p> Two versions are compared by examining the version string as
1277 * described in {@link #compareTo(Version)} with the exception that the
1278 * optional build information is always ignored. </p>
1279 *
1280 * <p> This method provides ordering which is consistent with
1281 * {@code equalsIgnoreOptional()}. </p>
1282 *
1283 * @param obj
1284 * The object to be compared
1285 *
1286 * @return A negative integer, zero, or a positive integer if this
1287 * {@code Version} is less than, equal to, or greater than the
1288 * given {@code Version}
1289 *
1290 * @throws NullPointerException
1291 * If the given object is {@code null}
1292 */
1293 public int compareToIgnoreOptional(Version obj) {
1294 return compare(obj, true);
1295 }
1296
1297 private int compare(Version obj, boolean ignoreOpt) {
1298 if (obj == null)
1299 throw new NullPointerException();
1300
1301 int ret = compareVersion(obj);
1302 if (ret != 0)
1303 return ret;
1304
1305 ret = comparePre(obj);
1306 if (ret != 0)
1307 return ret;
1308
1309 ret = compareBuild(obj);
1310 if (ret != 0)
1311 return ret;
1312
1313 if (!ignoreOpt)
1314 return compareOptional(obj);
1315
1316 return 0;
1317 }
1318
1319 private int compareVersion(Version obj) {
1320 int size = version.size();
1321 int oSize = obj.version().size();
1322 int min = Math.min(size, oSize);
1323 for (int i = 0; i < min; i++) {
1324 int val = version.get(i);
1325 int oVal = obj.version().get(i);
1326 if (val != oVal)
1327 return val - oVal;
1328 }
1329 return size - oSize;
1330 }
1331
1332 private int comparePre(Version obj) {
1333 Optional<String> oPre = obj.pre();
1334 if (!pre.isPresent()) {
1335 if (oPre.isPresent())
1336 return 1;
1337 } else {
1338 if (!oPre.isPresent())
1339 return -1;
1340 String val = pre.get();
1341 String oVal = oPre.get();
1342 if (val.matches("\\d+")) {
1343 return (oVal.matches("\\d+")
1344 ? (new BigInteger(val)).compareTo(new BigInteger(oVal))
1345 : -1);
1346 } else {
1347 return (oVal.matches("\\d+")
1348 ? 1
1349 : val.compareTo(oVal));
1350 }
1351 }
1352 return 0;
1353 }
1354
1355 private int compareBuild(Version obj) {
1356 Optional<Integer> oBuild = obj.build();
1357 if (oBuild.isPresent()) {
1358 return (build.isPresent()
1359 ? build.get().compareTo(oBuild.get())
1360 : -1);
1361 } else if (build.isPresent()) {
1362 return 1;
1363 }
1364 return 0;
1365 }
1366
1367 private int compareOptional(Version obj) {
1368 Optional<String> oOpt = obj.optional();
1369 if (!optional.isPresent()) {
1370 if (oOpt.isPresent())
1371 return -1;
1372 } else {
1373 if (!oOpt.isPresent())
1374 return 1;
1375 return optional.get().compareTo(oOpt.get());
1376 }
1377 return 0;
1378 }
1379
1380 /**
1381 * Returns a string representation of this version.
1382 *
1383 * @return The version string
1384 */
1385 @Override
1386 public String toString() {
1387 StringBuilder sb
1388 = new StringBuilder(version.stream()
1389 .map(Object::toString)
1390 .collect(Collectors.joining(".")));
1391
1392 pre.ifPresent(v -> sb.append("-").append(v));
1393
1394 if (build.isPresent()) {
1395 sb.append("+").append(build.get());
1396 if (optional.isPresent())
1397 sb.append("-").append(optional.get());
1398 } else {
1399 if (optional.isPresent()) {
1400 sb.append(pre.isPresent() ? "-" : "+-");
1401 sb.append(optional.get());
1402 }
1403 }
1404
1405 return sb.toString();
1406 }
1407
1408 /**
1409 * Determines whether this {@code Version} is equal to another object.
1410 *
1411 * <p> Two {@code Version}s are equal if and only if they represent the
1412 * same version string.
1413 *
1414 * @param obj
1415 * The object to which this {@code Version} is to be compared
1416 *
1417 * @return {@code true} if, and only if, the given object is a {@code
1418 * Version} that is identical to this {@code Version}
1419 *
1420 */
1421 @Override
1422 public boolean equals(Object obj) {
1423 boolean ret = equalsIgnoreOptional(obj);
1424 if (!ret)
1425 return false;
1426
1427 Version that = (Version)obj;
1428 return (this.optional().equals(that.optional()));
1429 }
1430
1431 /**
1432 * Determines whether this {@code Version} is equal to another
1433 * disregarding optional build information.
1434 *
1435 * <p> Two {@code Version}s are equal if and only if they represent the
1436 * same version string disregarding the optional build information.
1437 *
1438 * @param obj
1439 * The object to which this {@code Version} is to be compared
1440 *
1441 * @return {@code true} if, and only if, the given object is a {@code
1442 * Version} that is identical to this {@code Version}
1443 * ignoring the optional build information
1444 *
1445 */
1446 public boolean equalsIgnoreOptional(Object obj) {
1447 if (this == obj)
1448 return true;
1449 if (!(obj instanceof Version))
1450 return false;
1451
1452 Version that = (Version)obj;
1453 return (this.version().equals(that.version())
1454 && this.pre().equals(that.pre())
1455 && this.build().equals(that.build()));
1456 }
1457
1458 /**
1459 * Returns the hash code of this version.
1460 *
1461 * @return The hashcode of this version
1462 */
1463 @Override
1464 public int hashCode() {
1465 int h = 1;
1466 int p = 17;
1467
1468 h = p * h + version.hashCode();
1469 h = p * h + pre.hashCode();
1470 h = p * h + build.hashCode();
1471 h = p * h + optional.hashCode();
1472
1473 return h;
1474 }
1475 }
1476
1477 private static class VersionPattern {
1478 // $VNUM(-$PRE)?(\+($BUILD)?(\-$OPT)?)?
1479 // RE limits the format of version strings
1480 // ([1-9][0-9]*(?:(?:\.0)*\.[1-9][0-9]*)*)(?:-([a-zA-Z0-9]+))?(?:(\+)(0|[1-9][0-9]*)?)?(?:-([-a-zA-Z0-9.]+))?
1481
1482 private static final String VNUM
1483 = "(?<VNUM>[1-9][0-9]*(?:(?:\\.0)*\\.[1-9][0-9]*)*)";
1484 private static final String PRE = "(?:-(?<PRE>[a-zA-Z0-9]+))?";
1485 private static final String BUILD
1486 = "(?:(?<PLUS>\\+)(?<BUILD>0|[1-9][0-9]*)?)?";
1487 private static final String OPT = "(?:-(?<OPT>[-a-zA-Z0-9.]+))?";
1488 private static final String VSTR_FORMAT = VNUM + PRE + BUILD + OPT;
1489
1490 static final Pattern VSTR_PATTERN = Pattern.compile(VSTR_FORMAT);
1491
1492 static final String VNUM_GROUP = "VNUM";
1493 static final String PRE_GROUP = "PRE";
1494 static final String PLUS_GROUP = "PLUS";
1495 static final String BUILD_GROUP = "BUILD";
1496 static final String OPT_GROUP = "OPT";
1497 }
1498 }