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54 package org.apache.commons.lang;
55
56 /***
57 * <p>Helpers for <code>java.lang.System</code>.</p>
58 *
59 * <p>If a system property cannot be read due to security restrictions,
60 * the corresponding field in this class will be set to <code>null</code>
61 * and a message will be written to <code>System.err</code>.</p>
62 *
63 * @author Based on code from Avalon Excalibur
64 * @author Based on code from Lucene
65 * @author Stephen Colebourne
66 * @author <a href="mailto:sdowney@panix.com">Steve Downey</a>
67 * @author Gary Gregory
68 * @author Michael Becke
69 * @author Tetsuya Kaneuchi
70 * @since 1.0
71 * @version SystemUtils.java,v 1.23 2003/08/22 16:34:06 ggregory Exp
72 * @version $Id: SystemUtils.java,v 1.1 2004/05/13 01:22:34 dquintela Exp $
73 */
74 public class SystemUtils {
75
76
77
78
79
80 /***
81 * <p>The <code>file.encoding</code> System Property.</p>
82 * <p>File encoding, such as <code>Cp1252</code>.</p>
83 *
84 * <p>Defaults to <code>null</code> if the runtime does not have
85 * security access to read this property or the property does not exist.</p>
86 *
87 * @since 2.0
88 * @since Java 1.2.
89 */
90 public static final String FILE_ENCODING = getSystemProperty("file.encoding");
91
92 /***
93 * <p>The <code>file.separator</code> System Property.
94 * File separator (<code>"/"</code> on UNIX).</p>
95 *
96 * <p>Defaults to <code>null</code> if the runtime does not have
97 * security access to read this property or the property does not exist.</p>
98 *
99 * @since Java 1.1.
100 */
101 public static final String FILE_SEPARATOR = getSystemProperty("file.separator");
102
103 /***
104 * <p>The <code>java.class.path</code> System Property. Java class path.</p>
105 *
106 * <p>Defaults to <code>null</code> if the runtime does not have
107 * security access to read this property or the property does not exist.</p>
108 *
109 * @since Java 1.1.
110 */
111 public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
112
113 /***
114 * <p>The <code>java.class.version</code> System Property.
115 * Java class format version number.</p>
116 *
117 * <p>Defaults to <code>null</code> if the runtime does not have
118 * security access to read this property or the property does not exist.</p>
119 *
120 * @since Java 1.1.
121 */
122 public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
123
124 /***
125 * <p>The <code>java.compiler</code> System Property. Name of JIT compiler to use.
126 * First in JDK version 1.2. Not used in Sun JDKs after 1.2.</p>
127 *
128 * <p>Defaults to <code>null</code> if the runtime does not have
129 * security access to read this property or the property does not exist.</p>
130 *
131 * @since Java 1.2. Not used in Sun versions after 1.2.
132 */
133 public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
134
135 /***
136 * <p>The <code>java.ext.dirs</code> System Property. Path of extension directory
137 * or directories.</p>
138 *
139 * <p>Defaults to <code>null</code> if the runtime does not have
140 * security access to read this property or the property does not exist.</p>
141 *
142 * @since Java 1.3
143 */
144 public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
145
146 /***
147 * <p>The <code>java.home</code> System Property. Java installation directory.</p>
148 *
149 * <p>Defaults to <code>null</code> if the runtime does not have
150 * security access to read this property or the property does not exist.</p>
151 *
152 * @since Java 1.1
153 */
154 public static final String JAVA_HOME = getSystemProperty("java.home");
155
156 /***
157 * <p>The <code>java.io.tmpdir</code> System Property. Default temp file path.</p>
158 *
159 * <p>Defaults to <code>null</code> if the runtime does not have
160 * security access to read this property or the property does not exist.</p>
161 *
162 * @since Java 1.2
163 */
164 public static final String JAVA_IO_TMPDIR = getSystemProperty("java.io.tmpdir");
165
166 /***
167 * <p>The <code>java.library.path</code> System Property. List of paths to search
168 * when loading libraries.</p>
169 *
170 * <p>Defaults to <code>null</code> if the runtime does not have
171 * security access to read this property or the property does not exist.</p>
172 *
173 * @since Java 1.2
174 */
175 public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
176
177 /***
178 * <p>The <code>java.runtime.name</code> System Property. Java Runtime Environment
179 * name.</p>
180 *
181 * <p>Defaults to <code>null</code> if the runtime does not have
182 * security access to read this property or the property does not exist.</p>
183 *
184 * @since 2.0
185 * @since Java 1.3
186 */
187 public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
188
189 /***
190 * <p>The <code>java.runtime.version</code> System Property. Java Runtime Environment
191 * version.</p>
192 *
193 * <p>Defaults to <code>null</code> if the runtime does not have
194 * security access to read this property or the property does not exist.</p>
195 *
196 * @since 2.0
197 * @since Java 1.3
198 */
199 public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
200
201 /***
202 * <p>The <code>java.specification.name</code> System Property. Java Runtime Environment
203 * specification name.</p>
204 *
205 * <p>Defaults to <code>null</code> if the runtime does not have
206 * security access to read this property or the property does not exist.</p>
207 *
208 * @since Java 1.2
209 */
210 public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
211
212 /***
213 * <p>The <code>java.specification.vendor</code> System Property. Java Runtime Environment
214 * specification vendor.</p>
215 *
216 * <p>Defaults to <code>null</code> if the runtime does not have
217 * security access to read this property or the property does not exist.</p>
218 *
219 * @since Java 1.2
220 */
221 public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
222
223 /***
224 * <p>The <code>java.specification.version</code> System Property. Java Runtime Environment
225 * specification version.</p>
226 *
227 * <p>Defaults to <code>null</code> if the runtime does not have
228 * security access to read this property or the property does not exist.</p>
229 *
230 * @since Java 1.3
231 */
232 public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version");
233
234 /***
235 * <p>The <code>java.vendor</code> System Property. Java vendor-specific string.</p>
236 *
237 * <p>Defaults to <code>null</code> if the runtime does not have
238 * security access to read this property or the property does not exist.</p>
239 *
240 * @since Java 1.1
241 */
242 public static final String JAVA_VENDOR = getSystemProperty("java.vendor");
243
244 /***
245 * <p>The <code>java.vendor.url</code> System Property. Java vendor URL.</p>
246 *
247 * <p>Defaults to <code>null</code> if the runtime does not have
248 * security access to read this property or the property does not exist.</p>
249 *
250 * @since Java 1.1
251 */
252 public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
253
254 /***
255 * <p>The <code>java.version</code> System Property. Java version number.</p>
256 *
257 * <p>Defaults to <code>null</code> if the runtime does not have
258 * security access to read this property or the property does not exist.</p>
259 *
260 * @since Java 1.1
261 */
262 public static final String JAVA_VERSION = getSystemProperty("java.version");
263
264 /***
265 * <p>The <code>java.vm.info</code> System Property. Java Virtual Machine implementation
266 * info.</p>
267 *
268 * <p>Defaults to <code>null</code> if the runtime does not have
269 * security access to read this property or the property does not exist.</p>
270 *
271 * @since 2.0
272 * @since Java 1.2
273 */
274 public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info");
275
276 /***
277 * <p>The <code>java.vm.name</code> System Property. Java Virtual Machine implementation
278 * name.</p>
279 *
280 * <p>Defaults to <code>null</code> if the runtime does not have
281 * security access to read this property or the property does not exist.</p>
282 *
283 * @since Java 1.2
284 */
285 public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name");
286
287 /***
288 * <p>The <code>java.vm.specification.name</code> System Property. Java Virtual Machine
289 * specification name.</p>
290 *
291 * <p>Defaults to <code>null</code> if the runtime does not have
292 * security access to read this property or the property does not exist.</p>
293 *
294 * @since Java 1.2
295 */
296 public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
297
298 /***
299 * <p>The <code>java.vm.specification.vendor</code> System Property. Java Virtual
300 * Machine specification vendor.</p>
301 *
302 * <p>Defaults to <code>null</code> if the runtime does not have
303 * security access to read this property or the property does not exist.</p>
304 *
305 * @since Java 1.2
306 */
307 public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
308
309 /***
310 * <p>The <code>java.vm.specification.version</code> System Property. Java Virtual Machine
311 * specification version.</p>
312 *
313 * <p>Defaults to <code>null</code> if the runtime does not have
314 * security access to read this property or the property does not exist.</p>
315 *
316 * @since Java 1.2
317 */
318 public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
319
320 /***
321 * <p>The <code>java.vm.vendor</code> System Property. Java Virtual Machine implementation
322 * vendor.</p>
323 *
324 * <p>Defaults to <code>null</code> if the runtime does not have
325 * security access to read this property or the property does not exist.</p>
326 *
327 * @since Java 1.2
328 */
329 public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
330
331 /***
332 * <p>The <code>java.vm.version</code> System Property. Java Virtual Machine
333 * implementation version.</p>
334 *
335 * <p>Defaults to <code>null</code> if the runtime does not have
336 * security access to read this property or the property does not exist.</p>
337 *
338 * @since Java 1.2
339 */
340 public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version");
341
342 /***
343 * <p>The <code>line.separator</code> System Property. Line separator
344 * (<code>"\n<"</code> on UNIX).</p>
345 *
346 * <p>Defaults to <code>null</code> if the runtime does not have
347 * security access to read this property or the property does not exist.</p>
348 *
349 * @since Java 1.1
350 */
351 public static final String LINE_SEPARATOR = getSystemProperty("line.separator");
352
353 /***
354 * <p>The <code>os.arch</code> System Property. Operating system architecture.</p>
355 *
356 * <p>Defaults to <code>null</code> if the runtime does not have
357 * security access to read this property or the property does not exist.</p>
358 *
359 * @since Java 1.1
360 */
361 public static final String OS_ARCH = getSystemProperty("os.arch");
362
363 /***
364 * <p>The <code>os.name</code> System Property. Operating system name.</p>
365 *
366 * <p>Defaults to <code>null</code> if the runtime does not have
367 * security access to read this property or the property does not exist.</p>
368 *
369 * @since Java 1.1
370 */
371 public static final String OS_NAME = getSystemProperty("os.name");
372
373 /***
374 * <p>The <code>os.version</code> System Property. Operating system version.</p>
375 *
376 * <p>Defaults to <code>null</code> if the runtime does not have
377 * security access to read this property or the property does not exist.</p>
378 *
379 * @since Java 1.1
380 */
381 public static final String OS_VERSION = getSystemProperty("os.version");
382
383 /***
384 * <p>The <code>path.separator</code> System Property. Path separator
385 * (<code>":"</code> on UNIX).</p>
386 *
387 * <p>Defaults to <code>null</code> if the runtime does not have
388 * security access to read this property or the property does not exist.</p>
389 *
390 * @since Java 1.1
391 */
392 public static final String PATH_SEPARATOR = getSystemProperty("path.separator");
393
394 /***
395 * <p>The <code>user.country</code> or <code>user.region</code> System Property.
396 * User's country code, such as <code>GB</code>. First in JDK version 1.2 as
397 * <code>user.region</code>. Renamed to <code>user.country</code> in 1.4</p>
398 *
399 * <p>Defaults to <code>null</code> if the runtime does not have
400 * security access to read this property or the property does not exist.</p>
401 *
402 * @since 2.0
403 * @since Java 1.2
404 */
405 public static final String USER_COUNTRY =
406 (getSystemProperty("user.country") == null ?
407 getSystemProperty("user.region") : getSystemProperty("user.country"));
408
409 /***
410 * <p>The <code>user.dir</code> System Property. User's current working
411 * directory.</p>
412 *
413 * <p>Defaults to <code>null</code> if the runtime does not have
414 * security access to read this property or the property does not exist.</p>
415 *
416 * @since Java 1.1
417 */
418 public static final String USER_DIR = getSystemProperty("user.dir");
419
420 /***
421 * <p>The <code>user.home</code> System Property. User's home directory.</p>
422 *
423 * <p>Defaults to <code>null</code> if the runtime does not have
424 * security access to read this property or the property does not exist.</p>
425 *
426 * @since Java 1.1
427 */
428 public static final String USER_HOME = getSystemProperty("user.home");
429
430 /***
431 * <p>The <code>user.language</code> System Property. User's language code,
432 * such as 'en'.</p>
433 *
434 * <p>Defaults to <code>null</code> if the runtime does not have
435 * security access to read this property or the property does not exist.</p>
436 *
437 * @since 2.0
438 * @since Java 1.2
439 */
440 public static final String USER_LANGUAGE = getSystemProperty("user.language");
441
442 /***
443 * <p>The <code>user.name</code> System Property. User's account name.</p>
444 *
445 * <p>Defaults to <code>null</code> if the runtime does not have
446 * security access to read this property or the property does not exist.</p>
447 *
448 * @since Java 1.1
449 */
450 public static final String USER_NAME = getSystemProperty("user.name");
451
452
453
454
455
456
457 /***
458 * <p>Gets the Java version as a <code>float</code>.</p>
459 *
460 * <p>Example return values:</p>
461 * <ul>
462 * <li><code>1.2f</code> for JDK 1.2
463 * <li><code>1.31f</code> for JDK 1.3.1
464 * </ul>
465 *
466 * <p>The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.</p>
467 *
468 * @since 2.0
469 */
470 public static final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat();
471
472 /***
473 * <p>Gets the Java version as an <code>int</code>.</p>
474 *
475 * <p>Example return values:</p>
476 * <ul>
477 * <li><code>120</code> for JDK 1.2
478 * <li><code>131</code> for JDK 1.3.1
479 * </ul>
480 *
481 * <p>The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.</p>
482 *
483 * @since 2.0
484 */
485 public static final int JAVA_VERSION_INT = getJavaVersionAsInt();
486
487
488
489
490
491
492 /***
493 * <p>Is <code>true</code> if this is Java version 1.1 (also 1.1.x versions).</p>
494 *
495 * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
496 * <code>null</code>.</p>
497 */
498 public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
499
500 /***
501 * <p>Is <code>true</code> if this is Java version 1.2 (also 1.2.x versions).</p>
502 *
503 * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
504 * <code>null</code>.</p>
505 */
506 public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
507
508 /***
509 * <p>Is <code>true</code> if this is Java version 1.3 (also 1.3.x versions).</p>
510 *
511 * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
512 * <code>null</code>.</p>
513 */
514 public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
515
516 /***
517 * <p>Is <code>true</code> if this is Java version 1.4 (also 1.4.x versions).</p>
518 *
519 * <p>The field will <code>false</code> false if {@link #JAVA_VERSION} is
520 * <code>null</code>.</p>
521 */
522 public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
523
524 /***
525 * <p>Is <code>true</code> if this is Java version 1.5 (also 1.5.x versions).</p>
526 *
527 * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
528 * <code>null</code>.</p>
529 */
530 public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
531
532
533
534
535
536
537
538
539
540 /***
541 * <p>Is <code>true</code> if this is AIX.</p>
542 *
543 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
544 * <code>null</code>.</p>
545 *
546 * @since 2.0
547 */
548 public static final boolean IS_OS_AIX = getOSMatches("AIX");
549
550 /***
551 * <p>Is <code>true</code> if this is HP-UX.</p>
552 *
553 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
554 * <code>null</code>.</p>
555 *
556 * @since 2.0
557 */
558 public static final boolean IS_OS_HP_UX = getOSMatches("HP-UX");
559
560 /***
561 * <p>Is <code>true</code> if this is Irix.</p>
562 *
563 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
564 * <code>null</code>.</p>
565 *
566 * @since 2.0
567 */
568 public static final boolean IS_OS_IRIX = getOSMatches("Irix");
569
570 /***
571 * <p>Is <code>true</code> if this is Linux.</p>
572 *
573 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
574 * <code>null</code>.</p>
575 *
576 * @since 2.0
577 */
578 public static final boolean IS_OS_LINUX = getOSMatches("Linux") || getOSMatches("LINUX");
579
580 /***
581 * <p>Is <code>true</code> if this is Mac.</p>
582 *
583 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
584 * <code>null</code>.</p>
585 *
586 * @since 2.0
587 */
588 public static final boolean IS_OS_MAC = getOSMatches("Mac");
589
590 /***
591 * <p>Is <code>true</code> if this is Mac.</p>
592 *
593 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
594 * <code>null</code>.</p>
595 *
596 * @since 2.0
597 */
598 public static final boolean IS_OS_MAC_OSX = getOSMatches("Mac OS X");
599
600 /***
601 * <p>Is <code>true</code> if this is OS/2.</p>
602 *
603 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
604 * <code>null</code>.</p>
605 *
606 * @since 2.0
607 */
608 public static final boolean IS_OS_OS2 = getOSMatches("OS/2");
609
610 /***
611 * <p>Is <code>true</code> if this is Solaris.</p>
612 *
613 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
614 * <code>null</code>.</p>
615 *
616 * @since 2.0
617 */
618 public static final boolean IS_OS_SOLARIS = getOSMatches("Solaris");
619
620 /***
621 * <p>Is <code>true</code> if this is SunOS.</p>
622 *
623 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
624 * <code>null</code>.</p>
625 *
626 * @since 2.0
627 */
628 public static final boolean IS_OS_SUN_OS = getOSMatches("SunOS");
629
630 /***
631 * <p>Is <code>true</code> if this is Windows.</p>
632 *
633 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
634 * <code>null</code>.</p>
635 *
636 * @since 2.0
637 */
638 public static final boolean IS_OS_WINDOWS = getOSMatches("Windows");
639
640 /***
641 * <p>Is <code>true</code> if this is Windows 2000.</p>
642 *
643 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
644 * <code>null</code>.</p>
645 *
646 * @since 2.0
647 */
648 public static final boolean IS_OS_WINDOWS_2000 = getOSMatches("Windows", "5.0");
649
650 /***
651 * <p>Is <code>true</code> if this is Windows 95.</p>
652 *
653 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
654 * <code>null</code>.</p>
655 *
656 * @since 2.0
657 */
658 public static final boolean IS_OS_WINDOWS_95 = getOSMatches("Windows 9", "4.0");
659
660
661 /***
662 * <p>Is <code>true</code> if this is Windows 98.</p>
663 *
664 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
665 * <code>null</code>.</p>
666 *
667 * @since 2.0
668 */
669 public static final boolean IS_OS_WINDOWS_98 = getOSMatches("Windows 9", "4.1");
670
671
672 /***
673 * <p>Is <code>true</code> if this is Windows ME.</p>
674 *
675 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
676 * <code>null</code>.</p>
677 *
678 * @since 2.0
679 */
680 public static final boolean IS_OS_WINDOWS_ME = getOSMatches("Windows", "4.9");
681
682
683 /***
684 * <p>Is <code>true</code> if this is Windows NT.</p>
685 *
686 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
687 * <code>null</code>.</p>
688 *
689 * @since 2.0
690 */
691 public static final boolean IS_OS_WINDOWS_NT = getOSMatches("Windows NT");
692
693
694 /***
695 * <p>Is <code>true</code> if this is Windows XP.</p>
696 *
697 * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
698 * <code>null</code>.</p>
699 *
700 * @since 2.0
701 */
702 public static final boolean IS_OS_WINDOWS_XP = getOSMatches("Windows", "5.1");
703
704
705
706 /***
707 * <p>SystemUtils instances should NOT be constructed in standard
708 * programming. Instead, the class should be used as
709 * <code>SystemUtils.FILE_SEPARATOR</code>.</p>
710 *
711 * <p>This constructor is public to permit tools that require a JavaBean
712 * instance to operate.</p>
713 */
714 public SystemUtils() {
715 }
716
717
718 /***
719 * <p>Gets the Java version number as a <code>float</code>.</p>
720 *
721 * <p>Example return values:</p>
722 * <ul>
723 * <li><code>1.2f</code> for JDK 1.2
724 * <li><code>1.31f</code> for JDK 1.3.1
725 * </ul>
726 *
727 * @return the version, for example 1.31f for JDK 1.3.1
728 * @deprecated Use {@link #JAVA_VERSION_FLOAT} instead.
729 * Method will be removed in Commons Lang 3.0.
730 */
731 public static float getJavaVersion() {
732 return JAVA_VERSION_FLOAT;
733 }
734
735 /***
736 * <p>Gets the Java version number as a <code>float</code>.</p>
737 *
738 * <p>Example return values:</p>
739 * <ul>
740 * <li><code>1.2f</code> for JDK 1.2
741 * <li><code>1.31f</code> for JDK 1.3.1
742 * </ul>
743 *
744 * <p>Patch releases are not reported.
745 * Zero is returned if {@link #JAVA_VERSION} is <code>null</code>.</p>
746 *
747 * @return the version, for example 1.31f for JDK 1.3.1
748 */
749 private static float getJavaVersionAsFloat() {
750 if (JAVA_VERSION == null) {
751 return 0f;
752 }
753 String str = JAVA_VERSION.substring(0, 3);
754 if (JAVA_VERSION.length() >= 5) {
755 str = str + JAVA_VERSION.substring(4, 5);
756 }
757 return Float.parseFloat(str);
758 }
759
760 /***
761 * <p>Gets the Java version number as an <code>int</code>.</p>
762 *
763 * <p>Example return values:</p>
764 * <ul>
765 * <li><code>120</code> for JDK 1.2
766 * <li><code>131</code> for JDK 1.3.1
767 * </ul>
768 *
769 * <p>Patch releases are not reported.
770 * Zero is returned if {@link #JAVA_VERSION} is <code>null</code>.</p>
771 *
772 * @return the version, for example 131 for JDK 1.3.1
773 */
774 private static int getJavaVersionAsInt() {
775 if (JAVA_VERSION == null) {
776 return 0;
777 }
778 String str = JAVA_VERSION.substring(0, 1);
779 str = str + JAVA_VERSION.substring(2, 3);
780 if (JAVA_VERSION.length() >= 5) {
781 str = str + JAVA_VERSION.substring(4, 5);
782 } else {
783 str = str + "0";
784 }
785 return Integer.parseInt(str);
786 }
787
788 /***
789 * <p>Decides if the java version matches.</p>
790 *
791 * @param versionPrefix the prefix for the java version
792 * @return true if matches, or false if not or can't determine
793 */
794 private static boolean getJavaVersionMatches(String versionPrefix) {
795 if (JAVA_VERSION == null) {
796 return false;
797 }
798 return JAVA_VERSION.startsWith(versionPrefix);
799 }
800
801 /***
802 * <p>Decides if the operating system matches.</p>
803 *
804 * @param osNamePrefix the prefix for the os name
805 * @return true if matches, or false if not or can't determine
806 */
807 private static boolean getOSMatches(String osNamePrefix) {
808 if (OS_NAME == null) {
809 return false;
810 }
811 return OS_NAME.startsWith(osNamePrefix);
812 }
813
814 /***
815 * <p>Decides if the operating system matches.</p>
816 *
817 * @param osNamePrefix the prefix for the os name
818 * @param osVersionPrefix the prefix for the version
819 * @return true if matches, or false if not or can't determine
820 */
821 private static boolean getOSMatches(String osNamePrefix, String osVersionPrefix) {
822 if (OS_NAME == null || OS_VERSION == null) {
823 return false;
824 }
825 return OS_NAME.startsWith(osNamePrefix) && OS_VERSION.startsWith(osVersionPrefix);
826 }
827
828
829 /***
830 * <p>Gets a System property, defaulting to <code>null</code> if the property
831 * cannot be read.</p>
832 *
833 * <p>If a <code>SecurityException</code> is caught, the return
834 * value is <code>null</code> and a message is written to <code>System.err</code>.</p>
835 *
836 * @param property the system property name
837 * @return the system property value or <code>null</code> if a security problem occurs
838 */
839 private static String getSystemProperty(String property) {
840 try {
841 return System.getProperty(property);
842 } catch (SecurityException ex) {
843
844 System.err.println(
845 "Caught a SecurityException reading the system property '" + property
846 + "'; the SystemUtils property value will default to null."
847 );
848 return null;
849 }
850 }
851
852 /***
853 * <p>Is the Java version at least the requested version.</p>
854 *
855 * <p>Example input:</p>
856 * <ul>
857 * <li><code>1.2f</code> to test for JDK 1.2</li>
858 * <li><code>1.31f</code> to test for JDK 1.3.1</li>
859 * </ul>
860 *
861 * @param requiredVersion the required version, for example 1.31f
862 * @return <code>true</code> if the actual version is equal or greater
863 * than the required version
864 */
865 public static boolean isJavaVersionAtLeast(float requiredVersion) {
866 return (JAVA_VERSION_FLOAT >= requiredVersion);
867 }
868
869 /***
870 * <p>Is the Java version at least the requested version.</p>
871 *
872 * <p>Example input:</p>
873 * <ul>
874 * <li><code>120</code> to test for JDK 1.2 or greater</li>
875 * <li><code>131</code> to test for JDK 1.3.1 or greater</li>
876 * </ul>
877 *
878 * @param requiredVersion the required version, for example 131
879 * @return <code>true</code> if the actual version is equal or greater
880 * than the required version
881 * @since 2.0
882 */
883 public static boolean isJavaVersionAtLeast(int requiredVersion) {
884 return (JAVA_VERSION_INT >= requiredVersion);
885 }
886
887 }