Source Code Cross Referenced for Util.java in  » Database-DBMS » Quadcap-Embeddable-Database » com » quadcap » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Java Source Code / Java Documentation
1. 6.0 JDK Core
2. 6.0 JDK Modules
3. 6.0 JDK Modules com.sun
4. 6.0 JDK Modules com.sun.java
5. 6.0 JDK Modules sun
6. 6.0 JDK Platform
7. Ajax
8. Apache Harmony Java SE
9. Aspect oriented
10. Authentication Authorization
11. Blogger System
12. Build
13. Byte Code
14. Cache
15. Chart
16. Chat
17. Code Analyzer
18. Collaboration
19. Content Management System
20. Database Client
21. Database DBMS
22. Database JDBC Connection Pool
23. Database ORM
24. Development
25. EJB Server geronimo
26. EJB Server GlassFish
27. EJB Server JBoss 4.2.1
28. EJB Server resin 3.1.5
29. ERP CRM Financial
30. ESB
31. Forum
32. GIS
33. Graphic Library
34. Groupware
35. HTML Parser
36. IDE
37. IDE Eclipse
38. IDE Netbeans
39. Installer
40. Internationalization Localization
41. Inversion of Control
42. Issue Tracking
43. J2EE
44. JBoss
45. JMS
46. JMX
47. Library
48. Mail Clients
49. Net
50. Parser
51. PDF
52. Portal
53. Profiler
54. Project Management
55. Report
56. RSS RDF
57. Rule Engine
58. Science
59. Scripting
60. Search Engine
61. Security
62. Sevlet Container
63. Source Control
64. Swing Library
65. Template Engine
66. Test Coverage
67. Testing
68. UML
69. Web Crawler
70. Web Framework
71. Web Mail
72. Web Server
73. Web Services
74. Web Services apache cxf 2.0.1
75. Web Services AXIS2
76. Wiki Engine
77. Workflow Engines
78. XML
79. XML UI
Java
Java Tutorial
Java Open Source
Jar File Download
Java Articles
Java Products
Java by API
Photoshop Tutorials
Maya Tutorials
Flash Tutorials
3ds-Max Tutorials
Illustrator Tutorials
GIMP Tutorials
C# / C Sharp
C# / CSharp Tutorial
C# / CSharp Open Source
ASP.Net
ASP.NET Tutorial
JavaScript DHTML
JavaScript Tutorial
JavaScript Reference
HTML / CSS
HTML CSS Reference
C / ANSI-C
C Tutorial
C++
C++ Tutorial
Ruby
PHP
Python
Python Tutorial
Python Open Source
SQL Server / T-SQL
SQL Server / T-SQL Tutorial
Oracle PL / SQL
Oracle PL/SQL Tutorial
PostgreSQL
SQL / MySQL
MySQL Tutorial
VB.Net
VB.Net Tutorial
Flash / Flex / ActionScript
VBA / Excel / Access / Word
XML
XML Tutorial
Microsoft Office PowerPoint 2007 Tutorial
Microsoft Office Excel 2007 Tutorial
Microsoft Office Word 2007 Tutorial
Java Source Code / Java Documentation » Database DBMS » Quadcap Embeddable Database » com.quadcap.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package com.quadcap.util;
002:
003:        /* Copyright 1997 - 2003 Quadcap Software.  All rights reserved.
004:         *
005:         * This software is distributed under the Quadcap Free Software License.
006:         * This software may be used or modified for any purpose, personal or
007:         * commercial.  Open Source redistributions are permitted.  Commercial
008:         * redistribution of larger works derived from, or works which bundle
009:         * this software requires a "Commercial Redistribution License"; see
010:         * http://www.quadcap.com/purchase.
011:         *
012:         * Redistributions qualify as "Open Source" under  one of the following terms:
013:         *   
014:         *    Redistributions are made at no charge beyond the reasonable cost of
015:         *    materials and delivery.
016:         *
017:         *    Redistributions are accompanied by a copy of the Source Code or by an
018:         *    irrevocable offer to provide a copy of the Source Code for up to three
019:         *    years at the cost of materials and delivery.  Such redistributions
020:         *    must allow further use, modification, and redistribution of the Source
021:         *    Code under substantially the same terms as this license.
022:         *
023:         * Redistributions of source code must retain the copyright notices as they
024:         * appear in each source code file, these license terms, and the
025:         * disclaimer/limitation of liability set forth as paragraph 6 below.
026:         *
027:         * Redistributions in binary form must reproduce this Copyright Notice,
028:         * these license terms, and the disclaimer/limitation of liability set
029:         * forth as paragraph 6 below, in the documentation and/or other materials
030:         * provided with the distribution.
031:         *
032:         * The Software is provided on an "AS IS" basis.  No warranty is
033:         * provided that the Software is free of defects, or fit for a
034:         * particular purpose.  
035:         *
036:         * Limitation of Liability. Quadcap Software shall not be liable
037:         * for any damages suffered by the Licensee or any third party resulting
038:         * from use of the Software.
039:         */
040:
041:        //-//#ifdef JDK11
042:        //-import com.sun.java.util.collections.ArrayList;
043:        //-import com.sun.java.util.collections.Collections;
044:        //-import com.sun.java.util.collections.Comparator;
045:        //#endif
046:        import java.util.ArrayList;
047:        import java.util.Collections;
048:        import java.util.Comparator;
049:        import java.util.HashMap;
050:        import java.util.Hashtable;
051:        import java.util.List;
052:        import java.util.Properties;
053:        import java.util.Vector;
054:
055:        import java.io.ByteArrayInputStream;
056:        import java.io.ByteArrayOutputStream;
057:        import java.io.File;
058:        import java.io.FileInputStream;
059:        import java.io.FileOutputStream;
060:        import java.io.IOException;
061:        import java.io.InputStream;
062:        import java.io.OutputStream;
063:        import java.io.PrintStream;
064:
065:        import java.text.Collator;
066:
067:        import java.lang.reflect.Array;
068:
069:        /**
070:         * This class aggregates a bunch of various string manipulation utilities.
071:         *
072:         * @author Stan Bailes
073:         */
074:        public class Util {
075:            /**
076:             * Split a string into a vector of elements.
077:             */
078:            public static Vector split(String s, char delim) {
079:                return split(s, delim, -1);
080:            }
081:
082:            public static Vector split(String s, char delim, int cnt) {
083:                Vector v = new Vector();
084:                StringBuffer sb = new StringBuffer();
085:                for (int i = 0; i < s.length(); i++) {
086:                    char c = s.charAt(i);
087:                    if (c == delim && (cnt < 0 || v.size() + 1 < cnt)) {
088:                        if (sb.length() > 0) {
089:                            v.addElement(sb.toString());
090:                            sb = new StringBuffer();
091:                        }
092:                    } else {
093:                        sb.append(c);
094:                    }
095:                }
096:                if (sb.length() > 0) {
097:                    v.addElement(sb.toString());
098:                }
099:                while (v.size() < cnt) {
100:                    v.addElement(new String(""));
101:                }
102:                return v;
103:            }
104:
105:            public static Hashtable parseArgs(String args[]) {
106:                Hashtable t = new Hashtable();
107:                int i = 0;
108:                Vector a = new Vector();
109:                while (i < args.length && args[i].startsWith("-")) {
110:                    String arg = args[i];
111:                    if (arg.charAt(0) == '-') {
112:                        Vector v = (Vector) t.get(arg);
113:                        if (v == null)
114:                            v = new Vector();
115:                        v.addElement(args[i + 1]);
116:                        t.put(arg.substring(1), v);
117:                        i++;
118:                    } else {
119:                        a.addElement(arg);
120:                    }
121:                    i++;
122:                }
123:                t.put("", a);
124:                return t;
125:            }
126:
127:            public static String readFile(String filename) {
128:                File f = new File(filename);
129:                if (f.exists()) {
130:                    try {
131:                        FileInputStream is = new FileInputStream(f);
132:                        StringBuffer sb = new StringBuffer();
133:                        int c;
134:                        while ((c = is.read()) >= 0)
135:                            sb.append((char) c);
136:                        String r = sb.toString();
137:                        return r;
138:                    } catch (IOException e) {
139:                        Debug.println("Util.readFile(" + filename + ") "
140:                                + "Got IOException: " + e.toString());
141:                    }
142:                }
143:                return null;
144:            }
145:
146:            public static char[] hexMap = { '0', '1', '2', '3', '4', '5', '6',
147:                    '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
148:
149:            public static String strBytes(byte[] buf, int offset, int len) {
150:                if (buf == null || len == 0)
151:                    return "<null>";
152:                StringBuffer sb = new StringBuffer();
153:                for (int i = 0; i < len; i++) {
154:                    if ((i % 16) == 0 && (len - i > 12 || i > 0)) {
155:                        if (i > 0) {
156:                            sb.append(' ');
157:                            sb.append(' ');
158:                            for (int j = (i - 1) & ~15; j < i; j++) {
159:                                byte c = buf[offset + j];
160:                                if (c >= 0x20 && c <= 0x7f)
161:                                    sb.append((char) c);
162:                                else
163:                                    sb.append('.');
164:                            }
165:                        }
166:                        sb.append('\n');
167:                    }
168:                    byte b = buf[offset + i];
169:                    sb.append(hexMap[(b >> 4) & 0xf]);
170:                    sb.append(hexMap[b & 0xf]);
171:                    sb.append(' ');
172:                }
173:                if (len > 16)
174:                    for (int j = len; (j & 15) != 0; j++)
175:                        sb.append("   ");
176:                sb.append("  ");
177:                for (int j = (len - 1) & ~15; j < len; j++) {
178:                    byte c = buf[offset + j];
179:                    if (c >= 0x20 && c <= 0x7f)
180:                        sb.append((char) c);
181:                    else
182:                        sb.append('.');
183:                }
184:                return sb.toString();
185:            }
186:
187:            public static String hexBytes(byte[] buf) {
188:                if (buf == null)
189:                    return "<null>";
190:                return hexBytes(buf, 0, buf.length);
191:            }
192:
193:            public static String hexBytes(byte[] buf, int off, int len) {
194:                if (buf == null)
195:                    return "<null>";
196:                StringBuffer sb = new StringBuffer();
197:                for (int i = off; i < off + len; i++) {
198:                    if (i >= buf.length) {
199:                        sb.append("###### OVERRUN ######");
200:                        break;
201:                    }
202:                    byte b = buf[i];
203:                    sb.append(hexMap[(b >> 4) & 0xf]);
204:                    sb.append(hexMap[b & 0xf]);
205:                }
206:                return sb.toString();
207:            }
208:
209:            public static String hexInts(byte[] buf) {
210:                return hexInts(buf, 0, buf.length);
211:            }
212:
213:            public static String hexInts(byte[] buf, int off, int len) {
214:                if (buf == null)
215:                    return "<null>";
216:                StringBuffer sb = new StringBuffer();
217:                for (int i = off; i < off + len; i++) {
218:                    if (i >= buf.length) {
219:                        sb.append("###### OVERRUN ######");
220:                        break;
221:                    }
222:                    byte b = buf[i];
223:                    sb.append(hexMap[(b >> 4) & 0xf]);
224:                    sb.append(hexMap[b & 0xf]);
225:                    if ((((i + 1) - off) % 4) == 0)
226:                        sb.append(' ');
227:                }
228:                return sb.toString();
229:            }
230:
231:            public static String strBytes(byte[] buf) {
232:                if (buf == null)
233:                    return "<null>";
234:                return strBytes(buf, 0, buf.length);
235:            }
236:
237:            public static boolean boolProperty(String s) {
238:                return Boolean.getBoolean(s);
239:            }
240:
241:            public static int intProperty(String s, int defVal) {
242:                String v = System.getProperty(s);
243:                return v == null ? defVal : Integer.parseInt(v);
244:            }
245:
246:            public static String strProperty(String s, String defVal) {
247:                String v = System.getProperty(s);
248:                return v == null ? defVal : v;
249:            }
250:
251:            public static byte[] bytes(String s) {
252:                byte[] buf = new byte[s.length()];
253:                s.getBytes(0, buf.length, buf, 0);
254:                return buf;
255:            }
256:
257:            /**
258:             * To hell with character encodings ;-)
259:             */
260:            public static byte[] strCharsAsBytes(String s) {
261:                byte[] buf = new byte[s.length() * 2];
262:                char[] cbuf = s.toCharArray();
263:                charsToBytes(cbuf, 0, buf, 0, s.length());
264:                return buf;
265:            }
266:
267:            public static void bytesToChars(byte[] bbuf, int boff, char[] cbuf,
268:                    int coff, int clen) {
269:                int clim = coff + clen;
270:                while (coff < clim) {
271:                    int c1 = bbuf[boff++] & 0xff;
272:                    int c2 = bbuf[boff++] & 0xff;
273:                    cbuf[coff++] = (char) ((c1 << 8) | c2);
274:                }
275:            }
276:
277:            public static void charsToBytes(char[] cbuf, int coff, byte[] bbuf,
278:                    int boff, int clen) {
279:                int clim = coff + clen;
280:                while (coff < clim) {
281:                    char c = cbuf[coff++];
282:                    bbuf[boff++] = (byte) (c >> 8);
283:                    bbuf[boff++] = (byte) (c & 0xff);
284:                }
285:            }
286:
287:            /**
288:             * Convert an int to a byte array, MSB first
289:             *
290:             * @param i the int value
291:             */
292:            public static byte[] bytes(int i) {
293:                byte[] buf = new byte[4];
294:                buf[0] = (byte) ((i >> 24) & 0xff);
295:                buf[1] = (byte) ((i >> 16) & 0xff);
296:                buf[2] = (byte) ((i >> 8) & 0xff);
297:                buf[3] = (byte) ((i >> 0) & 0xff);
298:                return buf;
299:            }
300:
301:            /**
302:             * Convert a long to a byte array, MSB first.
303:             *
304:             * @param i the long value
305:             */
306:            public static byte[] bytes(long i) {
307:                byte[] buf = new byte[8];
308:                buf[0] = (byte) ((i >> 56) & 0xff);
309:                buf[1] = (byte) ((i >> 48) & 0xff);
310:                buf[2] = (byte) ((i >> 40) & 0xff);
311:                buf[3] = (byte) ((i >> 32) & 0xff);
312:                buf[4] = (byte) ((i >> 24) & 0xff);
313:                buf[5] = (byte) ((i >> 16) & 0xff);
314:                buf[6] = (byte) ((i >> 8) & 0xff);
315:                buf[7] = (byte) ((i >> 0) & 0xff);
316:                return buf;
317:            }
318:
319:            /**
320:             * Convert a byte array which represents an integer into an integer.
321:             *
322:             * @param buf the byte array, MSB first.
323:             * @return the integer value stored in the byte array.
324:             */
325:            public static int integer(byte[] buf) {
326:                int ret = 0;
327:                for (int i = 0; i < buf.length; i++) {
328:                    ret <<= 8;
329:                    ret |= (buf[i] & 0xff);
330:                }
331:                return ret;
332:            }
333:
334:            /**
335:             * Extract an integer from four bytes in a byte array.
336:             *
337:             * @param buf the byte array
338:             * @param pos the offset in the array of the first (MSB) byte of the int
339:             * @return the integer value stored in the byte array.
340:             */
341:            public static int integer(byte[] buf, int pos) {
342:                int b1 = buf[pos++] & 0xff;
343:                int b2 = buf[pos++] & 0xff;
344:                int b3 = buf[pos++] & 0xff;
345:                int b4 = buf[pos++] & 0xff;
346:                int val = (b1 << 24) + (b2 << 16) + (b3 << 8) + (b4 << 0);
347:                return val;
348:            }
349:
350:            public static void putInt(byte[] buf, int pos, int val) {
351:                buf[pos++] = (byte) ((val >>> 24) & 0xff);
352:                buf[pos++] = (byte) ((val >>> 16) & 0xff);
353:                buf[pos++] = (byte) ((val >>> 8) & 0xff);
354:                buf[pos] = (byte) ((val) & 0xff);
355:            }
356:
357:            public static void putLong(byte[] buf, int pos, long val) {
358:                buf[pos++] = (byte) ((val >>> 56) & 0xff);
359:                buf[pos++] = (byte) ((val >>> 48) & 0xff);
360:                buf[pos++] = (byte) ((val >>> 40) & 0xff);
361:                buf[pos++] = (byte) ((val >>> 32) & 0xff);
362:                buf[pos++] = (byte) ((val >>> 24) & 0xff);
363:                buf[pos++] = (byte) ((val >>> 16) & 0xff);
364:                buf[pos++] = (byte) ((val >>> 8) & 0xff);
365:                buf[pos] = (byte) ((val) & 0xff);
366:            }
367:
368:            /**
369:             * Convert a byte array which represents a long into a long.
370:             *
371:             * @param buf the byte array, MSB first.
372:             * @return the long value stored in the byte array.
373:             */
374:            public final static long bytesToLong(byte[] buf) {
375:                return bytesToLong(buf, 0);
376:            }
377:
378:            /**
379:             * Convert a byte array which represents a long into a long.
380:             *
381:             * @param buf the byte array, MSB first.
382:             * @return the long value stored in the byte array.
383:             */
384:            public final static long bytesToLong(byte[] buf, int offset) {
385:                long ret = 0;
386:                int lim = offset + 8;
387:                for (int i = offset; i < buf.length && i < lim; i++) {
388:                    ret <<= 8;
389:                    ret |= (buf[i] & 0xff);
390:                }
391:                return ret;
392:            }
393:
394:            /**
395:             * Byte-array comparison.
396:             *
397:             * @param k1 the byte array containing key 1.
398:             * @param s1 the starting offset of key 1 in <code>k1</code>.
399:             * @param c1 the length of key 1.
400:             * @param k2 the byte array containing key 2.
401:             * @param s2 the starting offset of key 2 in <code>k2</code>.
402:             * @param c2 the length of key 2.
403:             * @return<p><table cellspacing=2 border=2>
404:             *		<tr><td>&lt; zero<td>if key1 is less than key2
405:             *		<tr><td>zero<td>if key1 is equal to key2
406:             *		<tr><td>&gt; zero<td>if key1 is greater than key2</table>
407:             */
408:            public static int compareBytes(byte[] k1, int s1, int c1,
409:                    byte[] k2, int s2, int c2) {
410:                int l1 = s1 + c1;
411:                int l2 = s2 + c2;
412:                while (s1 < l1 && s2 < l2) {
413:                    if (k1[s1] < k2[s2])
414:                        return -1;
415:                    if (k1[s1] > k2[s2])
416:                        return 1;
417:                    s1++;
418:                    s2++;
419:                }
420:                if (c1 < c2)
421:                    return -1;
422:                if (c1 > c2)
423:                    return 1;
424:                return 0;
425:            }
426:
427:            public static int compareBytes(byte[] b1, byte[] b2) {
428:                return compareBytes(b1, 0, b1.length, b2, 0, b2.length);
429:            }
430:
431:            /**
432:             * Return a File object corresponding to the specified file name.
433:             * If the name is relative, it is located relative to the user's
434:             * current directory.  This is helpful for the case when we run
435:             * as a service from the /winnt/system32 directory and want to
436:             * open files relative to our install root.
437:             *
438:             * @param name the file name
439:             * @return the file
440:             */
441:            public static File userFile(String name) {
442:                File f = new File(name);
443:                f = new File(f.getAbsolutePath());
444:                return f;
445:            }
446:
447:            /**
448:             * Like File.list(), but returns directories first, and sorts alpha
449:             */
450:            public static String[] listFiles(final File f) {
451:                String[] s = f.list();
452:                if (s != null) {
453:                    final Collator col = Collator.getInstance();
454:                    Comparator c = new Comparator() {
455:                        public int compare(Object a, Object b) {
456:                            File fa = new File(f, a.toString());
457:                            File fb = new File(f, b.toString());
458:                            if (fa.isDirectory() && !fb.isDirectory())
459:                                return -1;
460:                            if (!fa.isDirectory() && fb.isDirectory())
461:                                return 1;
462:                            return col.compare(a.toString(), b.toString());
463:                        }
464:
465:                        public boolean equals(Object obj) {
466:                            return false;
467:                        }
468:                    };
469:                    ArrayList a = new ArrayList();
470:                    for (int i = 0; i < s.length; i++)
471:                        a.add(s[i]);
472:                    Collections.sort(a, c);
473:                    for (int i = 0; i < s.length; i++)
474:                        s[i] = (String) a.get(i);
475:                }
476:                return s;
477:            }
478:
479:            public static String getStackTrace(Throwable t) {
480:                ByteArrayOutputStream bos = new ByteArrayOutputStream();
481:                PrintStream ps = new PrintStream(bos);
482:                t.printStackTrace(ps);
483:                ps.flush();
484:                return bos.toString();
485:            }
486:
487:            static HashMap traces = new HashMap();
488:            static int lastTrace = 0;
489:
490:            /**
491:             * Return a string showing the current stack trace.
492:             */
493:            public static String stackTrace() {
494:                return stackTrace(new Exception(""), true);
495:            }
496:
497:            public static String stackTrace(boolean condense) {
498:                return stackTrace(new Exception(""), condense);
499:            }
500:
501:            /**
502:             * Return a string showing the current stack trace.
503:             */
504:            public static String stackTrace(Throwable e, boolean condense) {
505:                ByteArrayOutputStream bos = new ByteArrayOutputStream();
506:                PrintStream ps = new PrintStream(bos);
507:                e.printStackTrace(ps);
508:                ps.flush();
509:                ByteArrayInputStream bis = new ByteArrayInputStream(bos
510:                        .toByteArray());
511:                StringBuffer sb = new StringBuffer();
512:                int state = 1;
513:                while (state >= 0) {
514:                    int c = bis.read();
515:                    if (c < 0)
516:                        state = -1;
517:                    switch (state) {
518:                    case -1:
519:                        break;
520:                    case 0:
521:                        if (c == '\n')
522:                            state++;
523:                        break;
524:                    case 1:
525:                        if (c == '\n')
526:                            state++;
527:                        break;
528:                    case 2:
529:                        if (c == 'a')
530:                            state++;
531:                        break;
532:                    case 3:
533:                        if (c == 't')
534:                            state++;
535:                        break;
536:                    case 4:
537:                        if (c == ' ')
538:                            state++;
539:                        break;
540:                    case 5:
541:                        sb.append((char) c);
542:                        if (c == '\n')
543:                            state = 2;
544:                        break;
545:                    }
546:                }
547:                String s = sb.toString();
548:                Integer num = (Integer) traces.get(s);
549:                if (num == null) {
550:                    num = new Integer(++lastTrace);
551:                    traces.put(s, num);
552:                    s = "Trace " + num + ": " + s;
553:                } else {
554:                    s = "Trace " + num + (condense ? "" : (": " + s));
555:                }
556:                return s;
557:            }
558:
559:            public static void copyStream(InputStream in, OutputStream out)
560:                    throws IOException {
561:                byte[] buf = new byte[4096];
562:                int cnt;
563:                while ((cnt = in.read(buf)) > 0)
564:                    out.write(buf, 0, cnt);
565:            }
566:
567:            public static int execCommand(String cmd, OutputStream out,
568:                    OutputStream err) {
569:                int ret = -1;
570:                try {
571:                    Runtime r = Runtime.getRuntime();
572:                    Process p = r.exec(cmd);
573:                    return waitFor(p, out, err);
574:                } catch (IOException e) {
575:                    Debug.print(e);
576:                    ret = -1;
577:                }
578:                return ret;
579:            }
580:
581:            public static int execCommand(String[] cmdarray, OutputStream out,
582:                    OutputStream err) {
583:                int ret = -1;
584:                try {
585:                    Runtime r = Runtime.getRuntime();
586:                    Process p = r.exec(cmdarray);
587:                    return waitFor(p, out, err);
588:                } catch (IOException e) {
589:                    Debug.print(e);
590:                    ret = -1;
591:                }
592:                return ret;
593:            }
594:
595:            public static int waitFor(Process p, OutputStream out,
596:                    OutputStream err) throws IOException {
597:                Thread it = makeCopyThread(p.getInputStream(), out);
598:                Thread et = makeCopyThread(p.getErrorStream(), err);
599:                it.start();
600:                et.start();
601:                int ret = Util.waitFor(p);
602:                Util.join(it);
603:                Util.join(et);
604:                return ret;
605:            }
606:
607:            public static int execCommand(String cmd, OutputStream out) {
608:                return execCommand(cmd, out, out);
609:            }
610:
611:            public static String execCommand(String cmd) {
612:                ByteArrayOutputStream b = new ByteArrayOutputStream();
613:                execCommand(cmd, b);
614:                return b.toString();
615:            }
616:
617:            public static String execCommand(String[] cmd) {
618:                ByteArrayOutputStream b = new ByteArrayOutputStream();
619:                execCommand(cmd, b, b);
620:                return b.toString();
621:            }
622:
623:            public static String execCommand(String a, String b) {
624:                return execCommand(new String[] { a, b });
625:            }
626:
627:            public static String execCommand(String a, String b, String c) {
628:                return execCommand(new String[] { a, b, c });
629:            }
630:
631:            /**
632:             * Create a thread which copies bytes from an input stream to
633:             * an output stream until end of file is reached.
634:             */
635:            public static Thread makeCopyThread(final InputStream in,
636:                    final OutputStream out) {
637:                Thread t = new Thread() {
638:                    boolean terminate = false;
639:
640:                    public void run() {
641:                        int c;
642:                        try {
643:                            while (!terminate && (c = in.read()) >= 0)
644:                                out.write(c);
645:                        } catch (IOException e) {
646:                            Debug.print(e);
647:                        }
648:                    }
649:
650:                    public void terminate() {
651:                        this .terminate = true;
652:                    }
653:                };
654:                return t;
655:            }
656:
657:            /**
658:             * Utility to sleep without having to worry about catching
659:             * InterruptedException.
660:             *
661:             * @param ms milliseconds to sleep.
662:             */
663:            public static final void sleep(long ms) {
664:                try {
665:                    Thread.sleep(ms);
666:                } catch (InterruptedException e) {
667:                    Debug.print(e);
668:                }
669:            }
670:
671:            /**
672:             * Utility to join without having to worry about catching
673:             * InterruptedException.
674:             *
675:             * @param t the thread to wait for
676:             */
677:            public static final void join(Thread t) {
678:                try {
679:                    t.join();
680:                } catch (InterruptedException e) {
681:                    Debug.print(e);
682:                }
683:            }
684:
685:            /**
686:             * Utility to wait for a process without having to worry about catching
687:             * InterruptedException
688:             *
689:             * @param p the process to wait for
690:             */
691:            public static final int waitFor(Process p) {
692:                try {
693:                    return p.waitFor();
694:                } catch (InterruptedException e) {
695:                    Debug.print(e);
696:                    return -1;
697:                }
698:            }
699:
700:            /**
701:             * Parse a semicolon-separated property list:
702:             *
703:             * prop1=val1;prop2=val2
704:             */
705:            public static final Properties parsePropsString(String extraProps) {
706:                Properties props = new Properties();
707:                Vector v = Util.split(extraProps, ';');
708:                for (int i = 0; i < v.size(); i++) {
709:                    String prop = v.elementAt(i).toString();
710:                    int idx = prop.indexOf('=');
711:                    if (idx > 0) {
712:                        props.setProperty(prop.substring(0, idx), prop
713:                                .substring(idx + 1));
714:                    }
715:                }
716:                return props;
717:            }
718:
719:            /**
720:             * Generic array resizer
721:             */
722:            public static Object checkCapacity(Object array, int desiredcap) {
723:                int len = Array.getLength(array);
724:                if (len < desiredcap) {
725:                    Class c = array.getClass();
726:                    Class t = c.getComponentType();
727:                    Object n = Array.newInstance(t, desiredcap);
728:                    System.arraycopy(array, 0, n, 0, len);
729:                    array = n;
730:                }
731:                return array;
732:            }
733:
734:            /**
735:             * Parse a comma-separated list of integers or integer ranges.
736:             *
737:             * Example:  1,2
738:             * Example:  1,3-5,77
739:             *
740:             * @return a List of Integers
741:             */
742:            public static List parseIntList(String s) {
743:                List ret = new ArrayList();
744:                List tests = Util.split(s, ',');
745:
746:                for (int i = 0; i < tests.size(); i++) {
747:                    int first, last;
748:                    final String t = tests.get(i).toString();
749:                    final int idx = t.indexOf('-');
750:                    if (idx > 0) {
751:                        first = Integer.parseInt(t.substring(0, idx));
752:                        last = Integer.parseInt(t.substring(idx + 1));
753:                        if (last < first)
754:                            last = first;
755:                    } else {
756:                        first = last = Integer.parseInt(t);
757:                    }
758:                    for (int test = first; test <= last; test++) {
759:                        ret.add(new Integer(test));
760:                    }
761:                }
762:                return ret;
763:            }
764:
765:            public static int compareObjects(Object a, Object b) {
766:                if (a == null) {
767:                    return (b == null) ? 0 : -1;
768:                } else if (b == null) {
769:                    return 1;
770:                } else if (a instanceof  Comparable) {
771:                    return ((Comparable) a).compareTo(b);
772:                } else if (b instanceof  Comparable) {
773:                    return 0 - ((Comparable) b).compareTo(a);
774:                } else {
775:                    return String.valueOf(a).compareTo(String.valueOf(b));
776:                }
777:            }
778:
779:            public static String htmlEscape(String s) {
780:                StringBuffer sb = new StringBuffer();
781:                for (int i = 0; i < s.length(); i++) {
782:                    char c = s.charAt(i);
783:                    switch (c) {
784:                    case '<':
785:                        sb.append("&lt;");
786:                        break;
787:                    case '>':
788:                        sb.append("&gt;");
789:                        break;
790:                    case '&':
791:                        sb.append("&amp;");
792:                        break;
793:                    default:
794:                        sb.append(c);
795:                        break;
796:                    }
797:                }
798:                return sb.toString();
799:            }
800:
801:        }
www.java2java.com | Contact Us
Copyright 2009 - 12 Demo Source and Support. All rights reserved.
All other trademarks are property of their respective owners.