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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/StringUtils.java @ 274:92166f7c3842

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#50 Added code on database level to recognize the oldest collection item in a collection (-> master artifact). artifacts/trunk@2071 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Tue, 07 Jun 2011 17:09:25 +0000
parents 23ec48ce717e
children
rev   line source
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.artifactdatabase;
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10
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11 import java.io.UnsupportedEncodingException;
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12
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13 import java.util.UUID;
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14
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15 import org.apache.commons.codec.DecoderException;
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16
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17 import org.apache.commons.codec.binary.Hex;
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18
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19 import org.apache.log4j.Logger;
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20
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21 /**
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22 * Commonly used string functions.
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23 *
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24 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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25 */
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26 public final class StringUtils
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27 {
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28 private static Logger logger = Logger.getLogger(StringUtils.class);
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29
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30 /**
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31 * Generated a random UUIDv4 in form of a string.
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32 * @return the UUID
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33 */
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34 public static final String newUUID() {
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35 return UUID.randomUUID().toString();
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36 }
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37
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38 /**
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39 * Checks if a given string is a valid UUID.
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40 * @param uuid The string to test.
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41 * @return true if the string is a valid UUID else false.
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42 */
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43 public static final boolean checkUUID(String uuid) {
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44 try {
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45 UUID.fromString(uuid);
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46 }
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47 catch (IllegalArgumentException iae) {
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48 logger.warn(iae.getLocalizedMessage());
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49 return false;
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50 }
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51 return true;
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52 }
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53
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54 /**
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55 * Returns the UTF-8 byte array representation of a given string.
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56 * @param s The string to be transformed.
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57 * @return The byte array representation.
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58 */
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59 public static final byte [] getUTF8Bytes(String s) {
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60 try {
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61 return s.getBytes("UTF-8");
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62 }
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63 catch (UnsupportedEncodingException usee) {
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64 logger.error(usee.getLocalizedMessage(), usee);
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65 return s.getBytes();
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66 }
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67 }
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68
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69 /**
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70 * Tries to convert a Base64 encoded string into the
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71 * corresponing byte array.
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72 * @param s The Base64 encoded string
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73 * @return The byte array representation or null if
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74 * an decoding error occurs.
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75 */
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76 public static final byte [] decodeHex(String s) {
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77 try {
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78 return Hex.decodeHex(s.toCharArray());
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79 }
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80 catch (DecoderException de) {
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81 return null;
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82 }
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83 }
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84
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85 public static final String repeat(String s, int count, String sep) {
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86 if (count <= 0) {
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87 return "";
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88 }
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89 StringBuilder sb = new StringBuilder(s);
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90 for (--count; count > 0; --count) {
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91 sb.append(sep).append(s);
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92 }
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93 return sb.toString();
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94 }
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95
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96 public static final String repeat(char c, int count, char sep) {
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97 if (count <= 0) {
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98 return "";
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99 }
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100 StringBuilder sb = new StringBuilder(2*count-1).append(c);
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101 for (--count; count > 0; --count) {
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102 sb.append(sep).append(c);
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103 }
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104 return sb.toString();
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105 }
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106 }
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107 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org