Mercurial > dive4elements > framework
annotate artifacts-common/src/main/java/org/dive4elements/artifacts/common/utils/StringUtils.java @ 472:783cc1b6b615
Moved directories to org.dive4elements
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Thu, 25 Apr 2013 10:53:15 +0200 |
parents | artifacts-common/src/main/java/de/intevation/artifacts/common/utils/StringUtils.java@d75b7d19a3df |
children | 415df0fc4fa1 |
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.artifacts.common.utils; |
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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 } |
342
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106 |
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107 public static final String [] toUpperCase(String [] s) { |
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108 if (s == null) { |
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109 return null; |
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110 } |
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111 String [] d = new String[s.length]; |
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112 for (int i = 0; i < s.length; ++i) { |
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113 if (s[i] != null) { |
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114 d[i] = s[i].toUpperCase(); |
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115 } |
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116 } |
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117 return d; |
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118 } |
376
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119 |
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120 public static String join(String sep, String [] strings) { |
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121 StringBuilder sb = new StringBuilder(); |
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122 for (int i = 0; i < strings.length; ++i) { |
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123 if (i > 0) sb.append(sep); |
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124 sb.append(strings[i]); |
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125 } |
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126 return sb.toString(); |
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127 } |
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128 |
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129 public static final String [] join(String [] a, String [] b) { |
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130 if (a == null && b == null) return null; |
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131 if (a == null) return b; |
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132 if (b == null) return a; |
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133 String [] dst = new String[a.length + b.length]; |
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134 System.arraycopy(a, 0, dst, 0, a.length); |
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135 System.arraycopy(b, 0, dst, a.length, b.length); |
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136 return dst; |
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137 } |
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138 |
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139 public static final boolean contains(String needle, String [] haystack) { |
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140 for (String stray: haystack) { |
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141 if (needle.equals(stray)) { |
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142 return true; |
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143 } |
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144 } |
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145 return false; |
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146 } |
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147 } |
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148 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |