Mercurial > dive4elements > framework
comparison artifacts-common/src/main/java/de/intevation/artifacts/common/utils/StringUtils.java @ 301:b0a949d3fe09
Moved StringUtils to common package. Added some Override annotations.
artifacts/trunk@2394 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Fri, 22 Jul 2011 09:36:04 +0000 |
| parents | |
| children | 9a85e0ef6e02 |
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| 300:0035e2511342 | 301:b0a949d3fe09 |
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| 1 /* | |
| 2 * Copyright (c) 2010 by Intevation GmbH | |
| 3 * | |
| 4 * This program is free software under the LGPL (>=v2.1) | |
| 5 * Read the file LGPL.txt coming with the software for details | |
| 6 * or visit http://www.gnu.org/licenses/ if it does not exist. | |
| 7 */ | |
| 8 | |
| 9 package de.intevation.artifacts.common.utils; | |
| 10 | |
| 11 import java.io.UnsupportedEncodingException; | |
| 12 | |
| 13 import java.util.UUID; | |
| 14 | |
| 15 import org.apache.commons.codec.DecoderException; | |
| 16 | |
| 17 import org.apache.commons.codec.binary.Hex; | |
| 18 | |
| 19 import org.apache.log4j.Logger; | |
| 20 | |
| 21 /** | |
| 22 * Commonly used string functions. | |
| 23 * | |
| 24 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 25 */ | |
| 26 public final class StringUtils | |
| 27 { | |
| 28 private static Logger logger = Logger.getLogger(StringUtils.class); | |
| 29 | |
| 30 /** | |
| 31 * Generated a random UUIDv4 in form of a string. | |
| 32 * @return the UUID | |
| 33 */ | |
| 34 public static final String newUUID() { | |
| 35 return UUID.randomUUID().toString(); | |
| 36 } | |
| 37 | |
| 38 /** | |
| 39 * Checks if a given string is a valid UUID. | |
| 40 * @param uuid The string to test. | |
| 41 * @return true if the string is a valid UUID else false. | |
| 42 */ | |
| 43 public static final boolean checkUUID(String uuid) { | |
| 44 try { | |
| 45 UUID.fromString(uuid); | |
| 46 } | |
| 47 catch (IllegalArgumentException iae) { | |
| 48 logger.warn(iae.getLocalizedMessage()); | |
| 49 return false; | |
| 50 } | |
| 51 return true; | |
| 52 } | |
| 53 | |
| 54 /** | |
| 55 * Returns the UTF-8 byte array representation of a given string. | |
| 56 * @param s The string to be transformed. | |
| 57 * @return The byte array representation. | |
| 58 */ | |
| 59 public static final byte [] getUTF8Bytes(String s) { | |
| 60 try { | |
| 61 return s.getBytes("UTF-8"); | |
| 62 } | |
| 63 catch (UnsupportedEncodingException usee) { | |
| 64 logger.error(usee.getLocalizedMessage(), usee); | |
| 65 return s.getBytes(); | |
| 66 } | |
| 67 } | |
| 68 | |
| 69 /** | |
| 70 * Tries to convert a Base64 encoded string into the | |
| 71 * corresponing byte array. | |
| 72 * @param s The Base64 encoded string | |
| 73 * @return The byte array representation or null if | |
| 74 * an decoding error occurs. | |
| 75 */ | |
| 76 public static final byte [] decodeHex(String s) { | |
| 77 try { | |
| 78 return Hex.decodeHex(s.toCharArray()); | |
| 79 } | |
| 80 catch (DecoderException de) { | |
| 81 return null; | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 public static final String repeat(String s, int count, String sep) { | |
| 86 if (count <= 0) { | |
| 87 return ""; | |
| 88 } | |
| 89 StringBuilder sb = new StringBuilder(s); | |
| 90 for (--count; count > 0; --count) { | |
| 91 sb.append(sep).append(s); | |
| 92 } | |
| 93 return sb.toString(); | |
| 94 } | |
| 95 | |
| 96 public static final String repeat(char c, int count, char sep) { | |
| 97 if (count <= 0) { | |
| 98 return ""; | |
| 99 } | |
| 100 StringBuilder sb = new StringBuilder(2*count-1).append(c); | |
| 101 for (--count; count > 0; --count) { | |
| 102 sb.append(sep).append(c); | |
| 103 } | |
| 104 return sb.toString(); | |
| 105 } | |
| 106 } | |
| 107 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |