Mercurial > dive4elements > framework

annotate artifacts-common/src/main/java/org/dive4elements/artifacts/common/utils/StringUtils.java @ 570:584591f8203c 3.2.x

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Upgrade to Log4j 2
author Tom Gottfried <tom@intevation.de>
date Mon, 28 Feb 2022 17:41:14 +0100
parents 1f1f14c932ed
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 org.dive4elements.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.logging.log4j.Logger;
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20 import org.apache.logging.log4j.LogManager;
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21
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22 /**
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23 * Commonly used string functions.
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24 *
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25 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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26 */
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27 public final class StringUtils
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28 {
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29 private static Logger logger = LogManager.getLogger(StringUtils.class);
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30
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31 /**
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32 * Generated a random UUIDv4 in form of a string.
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33 * @return the UUID
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34 */
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35 public static final String newUUID() {
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36 return UUID.randomUUID().toString();
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37 }
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38
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39 /**
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40 * Checks if a given string is a valid UUID.
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41 * @param uuid The string to test.
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42 * @return true if the string is a valid UUID else false.
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43 */
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44 public static final boolean checkUUID(String uuid) {
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45 try {
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46 UUID.fromString(uuid);
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47 }
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48 catch (IllegalArgumentException iae) {
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49 logger.warn(iae.getLocalizedMessage());
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50 return false;
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51 }
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52 return true;
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53 }
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54
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55 /**
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56 * Returns the UTF-8 byte array representation of a given string.
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57 * @param s The string to be transformed.
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58 * @return The byte array representation.
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59 */
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60 public static final byte [] getUTF8Bytes(String s) {
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61 try {
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62 return s.getBytes("UTF-8");
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63 }
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64 catch (UnsupportedEncodingException usee) {
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65 logger.error(usee.getLocalizedMessage(), usee);
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66 return s.getBytes();
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67 }
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68 }
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69
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70 /**
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71 * Tries to convert a Base64 encoded string into the
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72 * corresponing byte array.
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73 * @param s The Base64 encoded string
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74 * @return The byte array representation or null if
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75 * an decoding error occurs.
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76 */
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77 public static final byte [] decodeHex(String s) {
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78 try {
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79 return Hex.decodeHex(s.toCharArray());
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80 }
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81 catch (DecoderException de) {
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82 return null;
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83 }
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84 }
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85
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86 public static final String repeat(String s, int count, String sep) {
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87 if (count <= 0) {
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88 return "";
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89 }
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90 StringBuilder sb = new StringBuilder(s);
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91 for (--count; count > 0; --count) {
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92 sb.append(sep).append(s);
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93 }
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94 return sb.toString();
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95 }
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96
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97 public static final String repeat(char c, int count, char sep) {
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98 if (count <= 0) {
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99 return "";
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100 }
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101 StringBuilder sb = new StringBuilder(2*count-1).append(c);
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102 for (--count; count > 0; --count) {
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103 sb.append(sep).append(c);
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104 }
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105 return sb.toString();
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106 }
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107
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108 public static final String [] toUpperCase(String [] s) {
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109 if (s == null) {
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110 return null;
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111 }
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112 String [] d = new String[s.length];
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113 for (int i = 0; i < s.length; ++i) {
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114 if (s[i] != null) {
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115 d[i] = s[i].toUpperCase();
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116 }
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117 }
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118 return d;
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119 }
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120
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121 public static String join(String sep, String [] strings) {
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122 StringBuilder sb = new StringBuilder();
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123 for (int i = 0; i < strings.length; ++i) {
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124 if (i > 0) sb.append(sep);
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125 sb.append(strings[i]);
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126 }
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127 return sb.toString();
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128 }
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129
401
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130 public static final String [] join(String [] a, String [] b) {
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131 if (a == null && b == null) return null;
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132 if (a == null) return b;
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133 if (b == null) return a;
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134 String [] dst = new String[a.length + b.length];
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135 System.arraycopy(a, 0, dst, 0, a.length);
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136 System.arraycopy(b, 0, dst, a.length, b.length);
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137 return dst;
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138 }
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139
498
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140 public static final int indexOf(String needle, String [] haystack) {
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141 for (int i = 0; i < haystack.length; ++i) {
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142 if (needle.equals(haystack[i])) {
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143 return i;
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144 }
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145 }
498
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146 return -1;
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147 }
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148
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149 public static final boolean contains(String needle, String [] haystack) {
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150 return indexOf(needle, haystack) != -1;
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151 }
301
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152 }
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153 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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