Java > Open Source Codes > org > apache > geronimo > system > configuration > condition > SystemUtils


1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package org.apache.geronimo.system.configuration.condition;
19
20 //
21 // NOTE: Lifted from Jakarta commons-lang to avoid needing to pull in all of
22 // commons-lang into the bootstrap classpath.
23 //
24 // DO NOT MODIFY ANY CODE BELOW
25 //
26
27 import java.io.File ;
28
29 /**
30  * <p>Helpers for <code>java.lang.System</code>.</p>
31  *
32  * <p>If a system property cannot be read due to security restrictions,
33  * the corresponding field in this class will be set to <code>null</code>
34  * and a message will be written to <code>System.err</code>.</p>
35  *
36  * @author Based on code from Avalon Excalibur
37  * @author Based on code from Lucene
38  * @author Stephen Colebourne
39  * @author <a HREF="mailto:sdowney@panix.com">Steve Downey</a>
40  * @author Gary Gregory
41  * @author Michael Becke
42  * @author Tetsuya Kaneuchi
43  * @author Rafal Krupinski
44  * @author Jason Gritman
45  * @since 1.0
46  * @version $Rev: 470597 $ $Date: 2006-11-02 18:30:55 -0500 (Thu, 02 Nov 2006) $
47  */
48 public class SystemUtils
49 {
50     /**
51      * The prefix String for all Windows OS.
52      */
53     private static final String OS_NAME_WINDOWS_PREFIX = "Windows";
54     
55     // System property constants
56 //-----------------------------------------------------------------------
57 // These MUST be declared first. Other constants depend on this.
58
59     /**
60      * The System property key for the user home directory.
61      */
62     private static final String USER_HOME_KEY = "user.home";
63
64     /**
65      * The System property key for the user directory.
66      */
67     private static final String USER_DIR_KEY = "user.dir";
68     
69     /**
70      * The System property key for the Java IO temporary directory.
71      */
72     private static final String JAVA_IO_TMPDIR_KEY = "java.io.tmpdir";
73     
74     /**
75      * The System property key for the Java home directory.
76      */
77     private static final String JAVA_HOME_KEY = "java.home";
78     
79     /**
80      * <p>The <code>awt.toolkit</code> System Property.</p>
81      * <p>Holds a class name, on Windows XP this is <code>sun.awt.windows.WToolkit</code>.</p>
82      * <p><b>On platforms without a GUI, this value is <code>null</code>.</b></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      * <p>
88      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
89      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
90      * will be out of sync with that System property.
91      * </p>
92      *
93      * @since 2.1
94      */
95     public static final String AWT_TOOLKIT = getSystemProperty("awt.toolkit");
96
97     /**
98      * <p>The <code>file.encoding</code> System Property.</p>
99      * <p>File encoding, such as <code>Cp1252</code>.</p>
100      *
101      * <p>Defaults to <code>null</code> if the runtime does not have
102      * security access to read this property or the property does not exist.</p>
103      *
104      * <p>
105      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
106      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
107      * will be out of sync with that System property.
108      * </p>
109      *
110      * @since 2.0
111      * @since Java 1.2
112      */
113     public static final String FILE_ENCODING = getSystemProperty("file.encoding");
114
115     /**
116      * <p>The <code>file.separator</code> System Property.
117      * File separator (<code>&quot;/&quot;</code> on UNIX).</p>
118      *
119      * <p>Defaults to <code>null</code> if the runtime does not have
120      * security access to read this property or the property does not exist.</p>
121      *
122      * <p>
123      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
124      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
125      * will be out of sync with that System property.
126      * </p>
127      *
128      * @since Java 1.1
129      */
130     public static final String FILE_SEPARATOR = getSystemProperty("file.separator");
131
132     /**
133      * <p>The <code>java.awt.fonts</code> System Property.</p>
134      *
135      * <p>Defaults to <code>null</code> if the runtime does not have
136      * security access to read this property or the property does not exist.</p>
137      *
138      * <p>
139      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
140      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
141      * will be out of sync with that System property.
142      * </p>
143      *
144      * @since 2.1
145      */
146     public static final String JAVA_AWT_FONTS = getSystemProperty("java.awt.fonts");
147
148     /**
149      * <p>The <code>java.awt.graphicsenv</code> System Property.</p>
150      *
151      * <p>Defaults to <code>null</code> if the runtime does not have
152      * security access to read this property or the property does not exist.</p>
153      *
154      * <p>
155      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
156      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
157      * will be out of sync with that System property.
158      * </p>
159      *
160      * @since 2.1
161      */
162     public static final String JAVA_AWT_GRAPHICSENV = getSystemProperty("java.awt.graphicsenv");
163
164     /**
165      * <p>
166      * The <code>java.awt.headless</code> System Property.
167      * The value of this property is the String <code>"true"</code> or <code>"false"</code>.
168      * </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      * <p>
174      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
175      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
176      * will be out of sync with that System property.
177      * </p>
178      *
179      * @see #isJavaAwtHeadless()
180      * @since 2.1
181      * @since Java 1.4
182      */
183     public static final String JAVA_AWT_HEADLESS = getSystemProperty("java.awt.headless");
184
185     /**
186      * <p>The <code>java.awt.printerjob</code> System Property.</p>
187      *
188      * <p>Defaults to <code>null</code> if the runtime does not have
189      * security access to read this property or the property does not exist.</p>
190      *
191      * <p>
192      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
193      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
194      * will be out of sync with that System property.
195      * </p>
196      *
197      * @since 2.1
198      */
199     public static final String JAVA_AWT_PRINTERJOB = getSystemProperty("java.awt.printerjob");
200
201     /**
202      * <p>The <code>java.class.path</code> System Property. Java class path.</p>
203      *
204      * <p>Defaults to <code>null</code> if the runtime does not have
205      * security access to read this property or the property does not exist.</p>
206      *
207      * <p>
208      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
209      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
210      * will be out of sync with that System property.
211      * </p>
212      *
213      * @since Java 1.1
214      */
215     public static final String JAVA_CLASS_PATH = getSystemProperty("java.class.path");
216
217     /**
218      * <p>The <code>java.class.version</code> System Property.
219      * Java class format version number.</p>
220      *
221      * <p>Defaults to <code>null</code> if the runtime does not have
222      * security access to read this property or the property does not exist.</p>
223      *
224      * <p>
225      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
226      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
227      * will be out of sync with that System property.
228      * </p>
229      *
230      * @since Java 1.1
231      */
232     public static final String JAVA_CLASS_VERSION = getSystemProperty("java.class.version");
233
234     /**
235      * <p>The <code>java.compiler</code> System Property. Name of JIT compiler to use.
236      * First in JDK version 1.2. Not used in Sun JDKs after 1.2.</p>
237      *
238      * <p>Defaults to <code>null</code> if the runtime does not have
239      * security access to read this property or the property does not exist.</p>
240      *
241      * <p>
242      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
243      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
244      * will be out of sync with that System property.
245      * </p>
246      *
247      * @since Java 1.2. Not used in Sun versions after 1.2.
248      */
249     public static final String JAVA_COMPILER = getSystemProperty("java.compiler");
250
251     /**
252      * <p>The <code>java.endorsed.dirs</code> System Property. Path of endorsed directory
253      * or directories.</p>
254      *
255      * <p>Defaults to <code>null</code> if the runtime does not have
256      * security access to read this property or the property does not exist.</p>
257      *
258      * <p>
259      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
260      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
261      * will be out of sync with that System property.
262      * </p>
263      *
264      * @since Java 1.4
265      */
266     public static final String JAVA_ENDORSED_DIRS = getSystemProperty("java.endorsed.dirs");
267
268     /**
269      * <p>The <code>java.ext.dirs</code> System Property. Path of extension directory
270      * or directories.</p>
271      *
272      * <p>Defaults to <code>null</code> if the runtime does not have
273      * security access to read this property or the property does not exist.</p>
274      *
275      * <p>
276      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
277      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
278      * will be out of sync with that System property.
279      * </p>
280      *
281      * @since Java 1.3
282      */
283     public static final String JAVA_EXT_DIRS = getSystemProperty("java.ext.dirs");
284
285     /**
286      * <p>The <code>java.home</code> System Property. Java installation directory.</p>
287      *
288      * <p>Defaults to <code>null</code> if the runtime does not have
289      * security access to read this property or the property does not exist.</p>
290      *
291      * <p>
292      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
293      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
294      * will be out of sync with that System property.
295      * </p>
296      *
297      * @since Java 1.1
298      */
299     public static final String JAVA_HOME = getSystemProperty(JAVA_HOME_KEY);
300
301     /**
302      * <p>The <code>java.io.tmpdir</code> System Property. Default temp file path.</p>
303      *
304      * <p>Defaults to <code>null</code> if the runtime does not have
305      * security access to read this property or the property does not exist.</p>
306      *
307      * <p>
308      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
309      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
310      * will be out of sync with that System property.
311      * </p>
312      *
313      * @since Java 1.2
314      */
315     public static final String JAVA_IO_TMPDIR = getSystemProperty(JAVA_IO_TMPDIR_KEY);
316
317     /**
318      * <p>The <code>java.library.path</code> System Property. List of paths to search
319      * when loading libraries.</p>
320      *
321      * <p>Defaults to <code>null</code> if the runtime does not have
322      * security access to read this property or the property does not exist.</p>
323      *
324      * <p>
325      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
326      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
327      * will be out of sync with that System property.
328      * </p>
329      *
330      * @since Java 1.2
331      */
332     public static final String JAVA_LIBRARY_PATH = getSystemProperty("java.library.path");
333
334     /**
335      * <p>The <code>java.runtime.name</code> System Property. Java Runtime Environment
336      * name.</p>
337      *
338      * <p>Defaults to <code>null</code> if the runtime does not have
339      * security access to read this property or the property does not exist.</p>
340      *
341      * <p>
342      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
343      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
344      * will be out of sync with that System property.
345      * </p>
346      *
347      * @since 2.0
348      * @since Java 1.3
349      */
350     public static final String JAVA_RUNTIME_NAME = getSystemProperty("java.runtime.name");
351
352     /**
353      * <p>The <code>java.runtime.version</code> System Property. Java Runtime Environment
354      * version.</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      * <p>
360      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
361      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
362      * will be out of sync with that System property.
363      * </p>
364      *
365      * @since 2.0
366      * @since Java 1.3
367      */
368     public static final String JAVA_RUNTIME_VERSION = getSystemProperty("java.runtime.version");
369
370     /**
371      * <p>The <code>java.specification.name</code> System Property. Java Runtime Environment
372      * specification name.</p>
373      *
374      * <p>Defaults to <code>null</code> if the runtime does not have
375      * security access to read this property or the property does not exist.</p>
376      *
377      * <p>
378      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
379      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
380      * will be out of sync with that System property.
381      * </p>
382      *
383      * @since Java 1.2
384      */
385     public static final String JAVA_SPECIFICATION_NAME = getSystemProperty("java.specification.name");
386
387     /**
388      * <p>The <code>java.specification.vendor</code> System Property. Java Runtime Environment
389      * specification vendor.</p>
390      *
391      * <p>Defaults to <code>null</code> if the runtime does not have
392      * security access to read this property or the property does not exist.</p>
393      *
394      * <p>
395      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
396      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
397      * will be out of sync with that System property.
398      * </p>
399      *
400      * @since Java 1.2
401      */
402     public static final String JAVA_SPECIFICATION_VENDOR = getSystemProperty("java.specification.vendor");
403
404     /**
405      * <p>The <code>java.specification.version</code> System Property. Java Runtime Environment
406      * specification version.</p>
407      *
408      * <p>Defaults to <code>null</code> if the runtime does not have
409      * security access to read this property or the property does not exist.</p>
410      *
411      * <p>
412      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
413      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
414      * will be out of sync with that System property.
415      * </p>
416      *
417      * @since Java 1.3
418      */
419     public static final String JAVA_SPECIFICATION_VERSION = getSystemProperty("java.specification.version");
420
421     /**
422      * <p>The <code>java.util.prefs.PreferencesFactory</code> System Property. A class name.</p>
423      *
424      * <p>Defaults to <code>null</code> if the runtime does not have
425      * security access to read this property or the property does not exist.</p>
426      *
427      * <p>
428      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
429      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
430      * will be out of sync with that System property.
431      * </p>
432      *
433      * @since 2.1
434      * @since Java 1.4
435      */
436     public static final String JAVA_UTIL_PREFS_PREFERENCES_FACTORY =
437         getSystemProperty("java.util.prefs.PreferencesFactory");
438
439     /**
440      * <p>The <code>java.vendor</code> System Property. Java vendor-specific string.</p>
441      *
442      * <p>Defaults to <code>null</code> if the runtime does not have
443      * security access to read this property or the property does not exist.</p>
444      *
445      * <p>
446      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
447      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
448      * will be out of sync with that System property.
449      * </p>
450      *
451      * @since Java 1.1
452      */
453     public static final String JAVA_VENDOR = getSystemProperty("java.vendor");
454
455     /**
456      * <p>The <code>java.vendor.url</code> System Property. Java vendor URL.</p>
457      *
458      * <p>Defaults to <code>null</code> if the runtime does not have
459      * security access to read this property or the property does not exist.</p>
460      *
461      * <p>
462      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
463      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
464      * will be out of sync with that System property.
465      * </p>
466      *
467      * @since Java 1.1
468     */
469     public static final String JAVA_VENDOR_URL = getSystemProperty("java.vendor.url");
470
471     /**
472      * <p>The <code>java.version</code> System Property. Java version number.</p>
473      *
474      * <p>Defaults to <code>null</code> if the runtime does not have
475      * security access to read this property or the property does not exist.</p>
476      *
477      * <p>
478      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
479      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
480      * will be out of sync with that System property.
481      * </p>
482      *
483      * @since Java 1.1
484      */
485     public static final String JAVA_VERSION = getSystemProperty("java.version");
486
487     /**
488      * <p>The <code>java.vm.info</code> System Property. Java Virtual Machine implementation
489      * info.</p>
490      *
491      * <p>Defaults to <code>null</code> if the runtime does not have
492      * security access to read this property or the property does not exist.</p>
493      *
494      * <p>
495      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
496      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
497      * will be out of sync with that System property.
498      * </p>
499      *
500      * @since 2.0
501      * @since Java 1.2
502      */
503     public static final String JAVA_VM_INFO = getSystemProperty("java.vm.info");
504
505     /**
506      * <p>The <code>java.vm.name</code> System Property. Java Virtual Machine implementation
507      * name.</p>
508      *
509      * <p>Defaults to <code>null</code> if the runtime does not have
510      * security access to read this property or the property does not exist.</p>
511      *
512      * <p>
513      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
514      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
515      * will be out of sync with that System property.
516      * </p>
517      *
518      * @since Java 1.2
519      */
520     public static final String JAVA_VM_NAME = getSystemProperty("java.vm.name");
521
522     /**
523      * <p>The <code>java.vm.specification.name</code> System Property. Java Virtual Machine
524      * specification name.</p>
525      *
526      * <p>Defaults to <code>null</code> if the runtime does not have
527      * security access to read this property or the property does not exist.</p>
528      *
529      * <p>
530      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
531      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
532      * will be out of sync with that System property.
533      * </p>
534      *
535      * @since Java 1.2
536      */
537     public static final String JAVA_VM_SPECIFICATION_NAME = getSystemProperty("java.vm.specification.name");
538
539     /**
540      * <p>The <code>java.vm.specification.vendor</code> System Property. Java Virtual
541      * Machine specification vendor.</p>
542      *
543      * <p>Defaults to <code>null</code> if the runtime does not have
544      * security access to read this property or the property does not exist.</p>
545      *
546      * <p>
547      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
548      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
549      * will be out of sync with that System property.
550      * </p>
551      *
552      * @since Java 1.2
553      */
554     public static final String JAVA_VM_SPECIFICATION_VENDOR = getSystemProperty("java.vm.specification.vendor");
555
556     /**
557      * <p>The <code>java.vm.specification.version</code> System Property. Java Virtual Machine
558      * specification version.</p>
559      *
560      * <p>Defaults to <code>null</code> if the runtime does not have
561      * security access to read this property or the property does not exist.</p>
562      *
563      * <p>
564      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
565      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
566      * will be out of sync with that System property.
567      * </p>
568      *
569      * @since Java 1.2
570      */
571     public static final String JAVA_VM_SPECIFICATION_VERSION = getSystemProperty("java.vm.specification.version");
572
573     /**
574      * <p>The <code>java.vm.vendor</code> System Property. Java Virtual Machine implementation
575      * vendor.</p>
576      *
577      * <p>Defaults to <code>null</code> if the runtime does not have
578      * security access to read this property or the property does not exist.</p>
579      *
580      * <p>
581      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
582      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
583      * will be out of sync with that System property.
584      * </p>
585      *
586      * @since Java 1.2
587      */
588     public static final String JAVA_VM_VENDOR = getSystemProperty("java.vm.vendor");
589
590     /**
591      * <p>The <code>java.vm.version</code> System Property. Java Virtual Machine
592      * implementation version.</p>
593      *
594      * <p>Defaults to <code>null</code> if the runtime does not have
595      * security access to read this property or the property does not exist.</p>
596      *
597      * <p>
598      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
599      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
600      * will be out of sync with that System property.
601      * </p>
602      *
603      * @since Java 1.2
604      */
605     public static final String JAVA_VM_VERSION = getSystemProperty("java.vm.version");
606
607     /**
608      * <p>The <code>line.separator</code> System Property. Line separator
609      * (<code>&quot;\n&quot;</code> on UNIX).</p>
610      *
611      * <p>Defaults to <code>null</code> if the runtime does not have
612      * security access to read this property or the property does not exist.</p>
613      *
614      * <p>
615      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
616      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
617      * will be out of sync with that System property.
618      * </p>
619      *
620      * @since Java 1.1
621      */
622     public static final String LINE_SEPARATOR = getSystemProperty("line.separator");
623
624     /**
625      * <p>The <code>os.arch</code> System Property. Operating system architecture.</p>
626      *
627      * <p>Defaults to <code>null</code> if the runtime does not have
628      * security access to read this property or the property does not exist.</p>
629      *
630      * <p>
631      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
632      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
633      * will be out of sync with that System property.
634      * </p>
635      *
636      * @since Java 1.1
637      */
638     public static final String OS_ARCH = getSystemProperty("os.arch");
639
640     /**
641      * <p>The <code>os.name</code> System Property. Operating system name.</p>
642      *
643      * <p>Defaults to <code>null</code> if the runtime does not have
644      * security access to read this property or the property does not exist.</p>
645      *
646      * <p>
647      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
648      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
649      * will be out of sync with that System property.
650      * </p>
651      *
652      * @since Java 1.1
653      */
654     public static final String OS_NAME = getSystemProperty("os.name");
655
656     /**
657      * <p>The <code>os.version</code> System Property. Operating system version.</p>
658      *
659      * <p>Defaults to <code>null</code> if the runtime does not have
660      * security access to read this property or the property does not exist.</p>
661      *
662      * <p>
663      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
664      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
665      * will be out of sync with that System property.
666      * </p>
667      *
668      * @since Java 1.1
669      */
670     public static final String OS_VERSION = getSystemProperty("os.version");
671
672     /**
673      * <p>The <code>path.separator</code> System Property. Path separator
674      * (<code>&quot;:&quot;</code> on UNIX).</p>
675      *
676      * <p>Defaults to <code>null</code> if the runtime does not have
677      * security access to read this property or the property does not exist.</p>
678      *
679      * <p>
680      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
681      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
682      * will be out of sync with that System property.
683      * </p>
684      *
685      * @since Java 1.1
686      */
687     public static final String PATH_SEPARATOR = getSystemProperty("path.separator");
688
689     /**
690      * <p>The <code>user.country</code> or <code>user.region</code> System Property.
691      * User's country code, such as <code>GB</code>. First in JDK version 1.2 as
692      * <code>user.region</code>. Renamed to <code>user.country</code> in 1.4</p>
693      *
694      * <p>Defaults to <code>null</code> if the runtime does not have
695      * security access to read this property or the property does not exist.</p>
696      *
697      * <p>
698      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
699      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
700      * will be out of sync with that System property.
701      * </p>
702      *
703      * @since 2.0
704      * @since Java 1.2
705      */
706     public static final String USER_COUNTRY =
707         getSystemProperty("user.country") == null ?
708             getSystemProperty("user.region") : getSystemProperty("user.country");
709
710     /**
711      * <p>The <code>user.dir</code> System Property. User's current working
712      * directory.</p>
713      *
714      * <p>Defaults to <code>null</code> if the runtime does not have
715      * security access to read this property or the property does not exist.</p>
716      *
717      * <p>
718      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
719      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
720      * will be out of sync with that System property.
721      * </p>
722      *
723      * @since Java 1.1
724      */
725     public static final String USER_DIR = getSystemProperty(USER_DIR_KEY);
726
727     /**
728      * <p>The <code>user.home</code> System Property. User's home directory.</p>
729      *
730      * <p>Defaults to <code>null</code> if the runtime does not have
731      * security access to read this property or the property does not exist.</p>
732      *
733      * <p>
734      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
735      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
736      * will be out of sync with that System property.
737      * </p>
738      *
739      * @since Java 1.1
740      */
741     public static final String USER_HOME = getSystemProperty(USER_HOME_KEY);
742
743     /**
744      * <p>The <code>user.language</code> System Property. User's language code,
745      * such as <code>"en"</code>.</p>
746      *
747      * <p>Defaults to <code>null</code> if the runtime does not have
748      * security access to read this property or the property does not exist.</p>
749      *
750      * <p>
751      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
752      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
753      * will be out of sync with that System property.
754      * </p>
755      *
756      * @since 2.0
757      * @since Java 1.2
758      */
759     public static final String USER_LANGUAGE = getSystemProperty("user.language");
760
761     /**
762      * <p>The <code>user.name</code> System Property. User's account name.</p>
763      *
764      * <p>Defaults to <code>null</code> if the runtime does not have
765      * security access to read this property or the property does not exist.</p>
766      *
767      * <p>
768      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
769      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
770      * will be out of sync with that System property.
771      * </p>
772      *
773      * @since Java 1.1
774      */
775     public static final String USER_NAME = getSystemProperty("user.name");
776
777     /**
778      * <p>The <code>user.timezone</code> System Property.
779      * For example: <code>"America/Los_Angeles"</code>.</p>
780      *
781      * <p>Defaults to <code>null</code> if the runtime does not have
782      * security access to read this property or the property does not exist.</p>
783      *
784      * <p>
785      * This value is initialized when the class is loaded. If {@link System#setProperty(String,String)}
786      * or {@link System#setProperties(java.util.Properties)} is called after this class is loaded, the value
787      * will be out of sync with that System property.
788      * </p>
789      *
790      * @since 2.1
791      */
792     public static final String USER_TIMEZONE = getSystemProperty("user.timezone");
793
794     // Java version
795 //-----------------------------------------------------------------------
796 // This MUST be declared after those above as it depends on the
797 // values being set up
798
799     /**
800      * <p>Gets the Java version as a <code>String</code> trimming leading letters.</p>
801      *
802      * <p>The field will return <code>null</code> if {@link #JAVA_VERSION} is <code>null</code>.</p>
803      *
804      * @since 2.1
805      */
806     public static final String JAVA_VERSION_TRIMMED = getJavaVersionTrimmed();
807
808     // Java version values
809 //-----------------------------------------------------------------------
810 // These MUST be declared after the trim above as they depend on the
811 // value being set up
812
813     /**
814      * <p>Gets the Java version as a <code>float</code>.</p>
815      *
816      * <p>Example return values:</p>
817      * <ul>
818      * <li><code>1.2f</code> for JDK 1.2
819      * <li><code>1.31f</code> for JDK 1.3.1
820      * </ul>
821      *
822      * <p>The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.</p>
823      *
824      * @since 2.0
825      */
826     public static final float JAVA_VERSION_FLOAT = getJavaVersionAsFloat();
827
828     /**
829      * <p>Gets the Java version as an <code>int</code>.</p>
830      *
831      * <p>Example return values:</p>
832      * <ul>
833      * <li><code>120</code> for JDK 1.2
834      * <li><code>131</code> for JDK 1.3.1
835      * </ul>
836      *
837      * <p>The field will return zero if {@link #JAVA_VERSION} is <code>null</code>.</p>
838      *
839      * @since 2.0
840      */
841     public static final int JAVA_VERSION_INT = getJavaVersionAsInt();
842
843     // Java version checks
844 //-----------------------------------------------------------------------
845 // These MUST be declared after those above as they depend on the
846 // values being set up
847
848     /**
849      * <p>Is <code>true</code> if this is Java version 1.1 (also 1.1.x versions).</p>
850      *
851      * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
852      * <code>null</code>.</p>
853      */
854     public static final boolean IS_JAVA_1_1 = getJavaVersionMatches("1.1");
855
856     /**
857      * <p>Is <code>true</code> if this is Java version 1.2 (also 1.2.x versions).</p>
858      *
859      * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
860      * <code>null</code>.</p>
861      */
862     public static final boolean IS_JAVA_1_2 = getJavaVersionMatches("1.2");
863
864     /**
865      * <p>Is <code>true</code> if this is Java version 1.3 (also 1.3.x versions).</p>
866      *
867      * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
868      * <code>null</code>.</p>
869      */
870     public static final boolean IS_JAVA_1_3 = getJavaVersionMatches("1.3");
871
872     /**
873      * <p>Is <code>true</code> if this is Java version 1.4 (also 1.4.x versions).</p>
874      *
875      * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
876      * <code>null</code>.</p>
877      */
878     public static final boolean IS_JAVA_1_4 = getJavaVersionMatches("1.4");
879
880     /**
881      * <p>Is <code>true</code> if this is Java version 1.5 (also 1.5.x versions).</p>
882      *
883      * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
884      * <code>null</code>.</p>
885      */
886     public static final boolean IS_JAVA_1_5 = getJavaVersionMatches("1.5");
887
888     /**
889      * <p>Is <code>true</code> if this is Java version 1.6 (also 1.6.x versions).</p>
890      *
891      * <p>The field will return <code>false</code> if {@link #JAVA_VERSION} is
892      * <code>null</code>.</p>
893      */
894     public static final boolean IS_JAVA_1_6 = getJavaVersionMatches("1.6");
895
896     // Operating system checks
897 //-----------------------------------------------------------------------
898 // These MUST be declared after those above as they depend on the
899 // values being set up
900 // OS names from http://www.vamphq.com/os.html
901 // Selected ones included - please advise commons-dev@jakarta.apache.org
902 // if you want another added or a mistake corrected
903
904     /**
905      * <p>Is <code>true</code> if this is AIX.</p>
906      *
907      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
908      * <code>null</code>.</p>
909      *
910      * @since 2.0
911      */
912     public static final boolean IS_OS_AIX = getOSMatches("AIX");
913
914     /**
915      * <p>Is <code>true</code> if this is HP-UX.</p>
916      *
917      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
918      * <code>null</code>.</p>
919      *
920      * @since 2.0
921      */
922     public static final boolean IS_OS_HP_UX = getOSMatches("HP-UX");
923
924     /**
925      * <p>Is <code>true</code> if this is Irix.</p>
926      *
927      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
928      * <code>null</code>.</p>
929      *
930      * @since 2.0
931      */
932     public static final boolean IS_OS_IRIX = getOSMatches("Irix");
933
934     /**
935      * <p>Is <code>true</code> if this is Linux.</p>
936      *
937      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
938      * <code>null</code>.</p>
939      *
940      * @since 2.0
941      */
942     public static final boolean IS_OS_LINUX = getOSMatches("Linux") || getOSMatches("LINUX");
943
944     /**
945      * <p>Is <code>true</code> if this is Mac.</p>
946      *
947      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
948      * <code>null</code>.</p>
949      *
950      * @since 2.0
951      */
952     public static final boolean IS_OS_MAC = getOSMatches("Mac");
953
954     /**
955      * <p>Is <code>true</code> if this is Mac.</p>
956      *
957      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
958      * <code>null</code>.</p>
959      *
960      * @since 2.0
961      */
962     public static final boolean IS_OS_MAC_OSX = getOSMatches("Mac OS X");
963
964     /**
965      * <p>Is <code>true</code> if this is OS/2.</p>
966      *
967      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
968      * <code>null</code>.</p>
969      *
970      * @since 2.0
971      */
972     public static final boolean IS_OS_OS2 = getOSMatches("OS/2");
973
974     /**
975      * <p>Is <code>true</code> if this is Solaris.</p>
976      *
977      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
978      * <code>null</code>.</p>
979      *
980      * @since 2.0
981      */
982     public static final boolean IS_OS_SOLARIS = getOSMatches("Solaris");
983
984     /**
985      * <p>Is <code>true</code> if this is SunOS.</p>
986      *
987      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
988      * <code>null</code>.</p>
989      *
990      * @since 2.0
991      */
992     public static final boolean IS_OS_SUN_OS = getOSMatches("SunOS");
993
994     /**
995      * <p>Is <code>true</code> if this is a POSIX compilant system,
996      * as in any of AIX, HP-UX, Irix, Linux, MacOSX, Solaris or SUN OS.</p>
997      *
998      * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
999      * <code>null</code>.</p>
1000     *
1001     * @since 2.1
1002     */
1003    public static final boolean IS_OS_UNIX =
1004        IS_OS_AIX || IS_OS_HP_UX || IS_OS_IRIX || IS_OS_LINUX ||
1005        IS_OS_MAC_OSX || IS_OS_SOLARIS || IS_OS_SUN_OS;
1006
1007    /**
1008     * <p>Is <code>true</code> if this is Windows.</p>
1009     *
1010     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1011     * <code>null</code>.</p>
1012     *
1013     * @since 2.0
1014     */
1015    public static final boolean IS_OS_WINDOWS = getOSMatches(OS_NAME_WINDOWS_PREFIX);
1016
1017    /**
1018     * <p>Is <code>true</code> if this is Windows 2000.</p>
1019     *
1020     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1021     * <code>null</code>.</p>
1022     *
1023     * @since 2.0
1024     */
1025    public static final boolean IS_OS_WINDOWS_2000 = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.0");
1026
1027    /**
1028     * <p>Is <code>true</code> if this is Windows 95.</p>
1029     *
1030     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1031     * <code>null</code>.</p>
1032     *
1033     * @since 2.0
1034     */
1035    public static final boolean IS_OS_WINDOWS_95 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.0");
1036    // JDK 1.2 running on Windows98 returns 'Windows 95', hence the above
1037
1038    /**
1039     * <p>Is <code>true</code> if this is Windows 98.</p>
1040     *
1041     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1042     * <code>null</code>.</p>
1043     *
1044     * @since 2.0
1045     */
1046    public static final boolean IS_OS_WINDOWS_98 = getOSMatches(OS_NAME_WINDOWS_PREFIX + " 9", "4.1");
1047    // JDK 1.2 running on Windows98 returns 'Windows 95', hence the above
1048
1049    /**
1050     * <p>Is <code>true</code> if this is Windows ME.</p>
1051     *
1052     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1053     * <code>null</code>.</p>
1054     *
1055     * @since 2.0
1056     */
1057    public static final boolean IS_OS_WINDOWS_ME = getOSMatches(OS_NAME_WINDOWS_PREFIX, "4.9");
1058    // JDK 1.2 running on WindowsME may return 'Windows 95', hence the above
1059
1060    /**
1061     * <p>Is <code>true</code> if this is Windows NT.</p>
1062     *
1063     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1064     * <code>null</code>.</p>
1065     *
1066     * @since 2.0
1067     */
1068    public static final boolean IS_OS_WINDOWS_NT = getOSMatches(OS_NAME_WINDOWS_PREFIX + " NT");
1069    // Windows 2000 returns 'Windows 2000' but may suffer from same JDK1.2 problem
1070
1071    /**
1072     * <p>Is <code>true</code> if this is Windows XP.</p>
1073     *
1074     * <p>The field will return <code>false</code> if <code>OS_NAME</code> is
1075     * <code>null</code>.</p>
1076     *
1077     * @since 2.0
1078     */
1079    public static final boolean IS_OS_WINDOWS_XP = getOSMatches(OS_NAME_WINDOWS_PREFIX, "5.1");
1080
1081    //-----------------------------------------------------------------------
1082 /**
1083     * <p>SystemUtils instances should NOT be constructed in standard
1084     * programming. Instead, the class should be used as
1085     * <code>SystemUtils.FILE_SEPARATOR</code>.</p>
1086     *
1087     * <p>This constructor is public to permit tools that require a JavaBean
1088     * instance to operate.</p>
1089     */
1090    public SystemUtils() {
1091        super();
1092    }
1093    
1094    //-----------------------------------------------------------------------
1095 /**
1096     * <p>Gets the Java version number as a <code>float</code>.</p>
1097     *
1098     * <p>Example return values:</p>
1099     * <ul>
1100     * <li><code>1.2f</code> for JDK 1.2
1101     * <li><code>1.31f</code> for JDK 1.3.1
1102     * </ul>
1103     *
1104     * @return the version, for example 1.31f for JDK 1.3.1
1105     * @deprecated Use {@link #JAVA_VERSION_FLOAT} instead.
1106     * Method will be removed in Commons Lang 3.0.
1107     */
1108    public static float getJavaVersion() {
1109        return JAVA_VERSION_FLOAT;
1110    }
1111
1112    /**
1113     * <p>Gets the Java version number as a <code>float</code>.</p>
1114     *
1115     * <p>Example return values:</p>
1116     * <ul>
1117     * <li><code>1.2f</code> for JDK 1.2
1118     * <li><code>1.31f</code> for JDK 1.3.1
1119     * </ul>
1120     *
1121     * <p>Patch releases are not reported.
1122     * Zero is returned if {@link #JAVA_VERSION_TRIMMED} is <code>null</code>.</p>
1123     *
1124     * @return the version, for example 1.31f for JDK 1.3.1
1125     */
1126    private static float getJavaVersionAsFloat() {
1127        if (JAVA_VERSION_TRIMMED == null) {
1128            return 0f;
1129        }
1130        String str = JAVA_VERSION_TRIMMED.substring(0, 3);
1131        if (JAVA_VERSION_TRIMMED.length() >= 5) {
1132            str = str + JAVA_VERSION_TRIMMED.substring(4, 5);
1133        }
1134        try {
1135            return Float.parseFloat(str);
1136        } catch (Exception ex) {
1137            return 0;
1138        }
1139    }
1140    
1141    /**
1142     * <p>Gets the Java version number as an <code>int</code>.</p>
1143     *
1144     * <p>Example return values:</p>
1145     * <ul>
1146     * <li><code>120</code> for JDK 1.2
1147     * <li><code>131</code> for JDK 1.3.1
1148     * </ul>
1149     *
1150     * <p>Patch releases are not reported.
1151     * Zero is returned if {@link #JAVA_VERSION_TRIMMED} is <code>null</code>.</p>
1152     *
1153     * @return the version, for example 131 for JDK 1.3.1
1154     */
1155    private static int getJavaVersionAsInt() {
1156        if (JAVA_VERSION_TRIMMED == null) {
1157            return 0;
1158        }
1159        String str = JAVA_VERSION_TRIMMED.substring(0, 1);
1160        str = str + JAVA_VERSION_TRIMMED.substring(2, 3);
1161        if (JAVA_VERSION_TRIMMED.length() >= 5) {
1162            str = str + JAVA_VERSION_TRIMMED.substring(4, 5);
1163        } else {
1164            str = str + "0";
1165        }
1166        try {
1167            return Integer.parseInt(str);
1168        } catch (Exception ex) {
1169            return 0;
1170        }
1171    }
1172
1173    /**
1174     * Trims the text of the java version to start with numbers.
1175     *
1176     * @return the trimmed java version
1177     */
1178    private static String getJavaVersionTrimmed() {
1179        if (JAVA_VERSION != null) {
1180            for (int i = 0; i < JAVA_VERSION.length(); i++) {
1181                char ch = JAVA_VERSION.charAt(i);
1182                if (ch >= '0' && ch <= '9') {
1183                    return JAVA_VERSION.substring(i);
1184                }
1185            }
1186        }
1187        return null;
1188    }
1189
1190    /**
1191     * <p>Decides if the java version matches.</p>
1192     *
1193     * @param versionPrefix the prefix for the java version
1194     * @return true if matches, or false if not or can't determine
1195     */
1196    private static boolean getJavaVersionMatches(String versionPrefix) {
1197        if (JAVA_VERSION_TRIMMED == null) {
1198            return false;
1199        }
1200        return JAVA_VERSION_TRIMMED.startsWith(versionPrefix);
1201    }
1202    
1203    /**
1204     * <p>Decides if the operating system matches.</p>
1205     *
1206     * @param osNamePrefix the prefix for the os name
1207     * @return true if matches, or false if not or can't determine
1208     */
1209    private static boolean getOSMatches(String osNamePrefix) {
1210        if (OS_NAME == null) {
1211            return false;
1212        }
1213        return OS_NAME.startsWith(osNamePrefix);
1214    }
1215
1216    /**
1217     * <p>Decides if the operating system matches.</p>
1218     *
1219     * @param osNamePrefix the prefix for the os name
1220     * @param osVersionPrefix the prefix for the version
1221     * @return true if matches, or false if not or can't determine
1222     */
1223    private static boolean getOSMatches(String osNamePrefix, String osVersionPrefix) {
1224        if (OS_NAME == null || OS_VERSION == null) {
1225            return false;
1226        }
1227        return OS_NAME.startsWith(osNamePrefix) && OS_VERSION.startsWith(osVersionPrefix);
1228    }
1229
1230    //-----------------------------------------------------------------------
1231 /**
1232     * <p>Gets a System property, defaulting to <code>null</code> if the property
1233     * cannot be read.</p>
1234     *
1235     * <p>If a <code>SecurityException</code> is caught, the return
1236     * value is <code>null</code> and a message is written to <code>System.err</code>.</p>
1237     *
1238     * @param property the system property name
1239     * @return the system property value or <code>null</code> if a security problem occurs
1240     */
1241    private static String getSystemProperty(String property) {
1242        try {
1243            return System.getProperty(property);
1244        } catch (SecurityException ex) {
1245            // we are not allowed to look at this property
1246 System.err.println(
1247                "Caught a SecurityException reading the system property '" + property
1248                + "'; the SystemUtils property value will default to null."
1249            );
1250            return null;
1251        }
1252    }
1253    
1254    /**
1255     * <p>Is the Java version at least the requested version.</p>
1256     *
1257     * <p>Example input:</p>
1258     * <ul>
1259     * <li><code>1.2f</code> to test for JDK 1.2</li>
1260     * <li><code>1.31f</code> to test for JDK 1.3.1</li>
1261     * </ul>
1262     *
1263     * @param requiredVersion the required version, for example 1.31f
1264     * @return <code>true</code> if the actual version is equal or greater
1265     * than the required version
1266     */
1267    public static boolean isJavaVersionAtLeast(float requiredVersion) {
1268        return JAVA_VERSION_FLOAT >= requiredVersion;
1269    }
1270    
1271    /**
1272     * <p>Is the Java version at least the requested version.</p>
1273     *
1274     * <p>Example input:</p>
1275     * <ul>
1276     * <li><code>120</code> to test for JDK 1.2 or greater</li>
1277     * <li><code>131</code> to test for JDK 1.3.1 or greater</li>
1278     * </ul>
1279     *
1280     * @param requiredVersion the required version, for example 131
1281     * @return <code>true</code> if the actual version is equal or greater
1282     * than the required version
1283     * @since 2.0
1284     */
1285    public static boolean isJavaVersionAtLeast(int requiredVersion) {
1286        return JAVA_VERSION_INT >= requiredVersion;
1287    }
1288
1289    /**
1290     * Returns whether the {@link #JAVA_AWT_HEADLESS} value is <code>true</code>.
1291     *
1292     * @return <code>true</code> if <code>JAVA_AWT_HEADLESS</code> is <code>"true"</code>,
1293     * <code>false</code> otherwise.
1294     *
1295     * @see #JAVA_AWT_HEADLESS
1296     * @since 2.1
1297     * @since Java 1.4
1298     */
1299    public static boolean isJavaAwtHeadless() {
1300        return JAVA_AWT_HEADLESS != null ? JAVA_AWT_HEADLESS.equals(Boolean.TRUE.toString()) : false;
1301    }
1302    /**
1303     * <p>Gets the Java home directory as a <code>File</code>.</p>
1304     *
1305     * @return a directory
1306     * @throws SecurityException if a security manager exists and its
1307     * <code>checkPropertyAccess</code> method doesn't allow
1308     * access to the specified system property.
1309     * @see System#getProperty(String)
1310     * @since 2.1
1311     */
1312    public static File getJavaHome() {
1313        return new File (System.getProperty(JAVA_HOME_KEY));
1314    }
1315
1316    /**
1317     * <p>Gets the Java IO temporary directory as a <code>File</code>.</p>
1318     *
1319     * @return a directory
1320     * @throws SecurityException if a security manager exists and its
1321     * <code>checkPropertyAccess</code> method doesn't allow
1322     * access to the specified system property.
1323     * @see System#getProperty(String)
1324     * @since 2.1
1325     */
1326    public static File getJavaIoTmpDir() {
1327        return new File (System.getProperty(JAVA_IO_TMPDIR_KEY));
1328    }
1329
1330    /**
1331     * <p>Gets the user directory as a <code>File</code>.</p>
1332     *
1333     * @return a directory
1334     * @throws SecurityException if a security manager exists and its
1335     * <code>checkPropertyAccess</code> method doesn't allow
1336     * access to the specified system property.
1337     * @see System#getProperty(String)
1338     * @since 2.1
1339     */
1340    public static File getUserDir() {
1341        return new File (System.getProperty(USER_DIR_KEY));
1342    }
1343
1344    /**
1345     * <p>Gets the user home directory as a <code>File</code>.</p>
1346     *
1347     * @return a directory
1348     * @throws SecurityException if a security manager exists and its
1349     * <code>checkPropertyAccess</code> method doesn't allow
1350     * access to the specified system property.
1351     * @see System#getProperty(String)
1352     * @since 2.1
1353     */
1354    public static File getUserHome() {
1355        return new File (System.getProperty(USER_HOME_KEY));
1356    }
1357
1358}

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