1 | /*
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2 | * Licensed to the Apache Software Foundation (ASF) under one or more
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3 | * contributor license agreements. See the NOTICE file distributed with
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4 | * this work for additional information regarding copyright ownership.
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5 | * The ASF licenses this file to You under the Apache License, Version 2.0
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6 | * (the "License"); you may not use this file except in compliance with
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7 | * the License. You may obtain a copy of the License at
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8 | *
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9 | * http://www.apache.org/licenses/LICENSE-2.0
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10 | *
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11 | * Unless required by applicable law or agreed to in writing, software
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12 | * distributed under the License is distributed on an "AS IS" BASIS,
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13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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14 | * See the License for the specific language governing permissions and
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15 | * limitations under the License.
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16 | */
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17 | package agents.org.apache.commons.lang;
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18 |
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19 | /**
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20 | * <p>Operations on char primitives and Character objects.</p>
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21 | *
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22 | * <p>This class tries to handle <code>null</code> input gracefully.
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23 | * An exception will not be thrown for a <code>null</code> input.
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24 | * Each method documents its behaviour in more detail.</p>
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25 | *
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26 | * <p>#ThreadSafe#</p>
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27 | * @author Apache Software Foundation
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28 | * @since 2.1
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29 | * @version $Id: CharUtils.java 1056988 2011-01-09 17:58:53Z niallp $
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30 | */
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31 | public class CharUtils {
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32 |
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33 | private static final String CHAR_STRING =
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34 | "\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007" +
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35 | "\b\t\n\u000b\f\r\u000e\u000f" +
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36 | "\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017" +
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37 | "\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f" +
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38 | "\u0020\u0021\"\u0023\u0024\u0025\u0026\u0027" +
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39 | "\u0028\u0029\u002a\u002b\u002c\u002d\u002e\u002f" +
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40 | "\u0030\u0031\u0032\u0033\u0034\u0035\u0036\u0037" +
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41 | "\u0038\u0039\u003a\u003b\u003c\u003d\u003e\u003f" +
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42 | "\u0040\u0041\u0042\u0043\u0044\u0045\u0046\u0047" +
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43 | "\u0048\u0049\u004a\u004b\u004c\u004d\u004e\u004f" +
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44 | "\u0050\u0051\u0052\u0053\u0054\u0055\u0056\u0057" +
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45 | "\u0058\u0059\u005a\u005b\\\u005d\u005e\u005f" +
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46 | "\u0060\u0061\u0062\u0063\u0064\u0065\u0066\u0067" +
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47 | "\u0068\u0069\u006a\u006b\u006c\u006d\u006e\u006f" +
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48 | "\u0070\u0071\u0072\u0073\u0074\u0075\u0076\u0077" +
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49 | "\u0078\u0079\u007a\u007b\u007c\u007d\u007e\u007f";
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50 |
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51 | private static final String[] CHAR_STRING_ARRAY = new String[128];
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52 | private static final Character[] CHAR_ARRAY = new Character[128];
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53 |
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54 | /**
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55 | * <code>\u000a</code> linefeed LF ('\n').
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56 | *
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57 | * @see <a href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#101089">JLF: Escape Sequences
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58 | * for Character and String Literals</a>
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59 | * @since 2.2
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60 | */
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61 | public static final char LF = '\n';
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62 |
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63 | /**
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64 | * <code>\u000d</code> carriage return CR ('\r').
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65 | *
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66 | * @see <a href="http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#101089">JLF: Escape Sequences
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67 | * for Character and String Literals</a>
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68 | * @since 2.2
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69 | */
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70 | public static final char CR = '\r';
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71 |
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72 |
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73 | static {
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74 | for (int i = 127; i >= 0; i--) {
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75 | CHAR_STRING_ARRAY[i] = CHAR_STRING.substring(i, i + 1);
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76 | CHAR_ARRAY[i] = new Character((char) i);
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77 | }
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78 | }
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79 |
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80 | /**
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81 | * <p><code>CharUtils</code> instances should NOT be constructed in standard programming.
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82 | * Instead, the class should be used as <code>CharUtils.toString('c');</code>.</p>
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83 | *
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84 | * <p>This constructor is public to permit tools that require a JavaBean instance
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85 | * to operate.</p>
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86 | */
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87 | public CharUtils() {
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88 | super();
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89 | }
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90 |
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91 | //-----------------------------------------------------------------------
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92 | /**
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93 | * <p>Converts the character to a Character.</p>
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94 | *
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95 | * <p>For ASCII 7 bit characters, this uses a cache that will return the
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96 | * same Character object each time.</p>
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97 | *
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98 | * <pre>
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99 | * CharUtils.toCharacterObject(' ') = ' '
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100 | * CharUtils.toCharacterObject('A') = 'A'
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101 | * </pre>
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102 | *
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103 | * @param ch the character to convert
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104 | * @return a Character of the specified character
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105 | */
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106 | public static Character toCharacterObject(char ch) {
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107 | if (ch < CHAR_ARRAY.length) {
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108 | return CHAR_ARRAY[ch];
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109 | }
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110 | return new Character(ch);
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111 | }
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112 |
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113 | /**
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114 | * <p>Converts the String to a Character using the first character, returning
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115 | * null for empty Strings.</p>
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116 | *
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117 | * <p>For ASCII 7 bit characters, this uses a cache that will return the
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118 | * same Character object each time.</p>
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119 | *
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120 | * <pre>
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121 | * CharUtils.toCharacterObject(null) = null
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122 | * CharUtils.toCharacterObject("") = null
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123 | * CharUtils.toCharacterObject("A") = 'A'
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124 | * CharUtils.toCharacterObject("BA") = 'B'
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125 | * </pre>
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126 | *
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127 | * @param str the character to convert
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128 | * @return the Character value of the first letter of the String
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129 | */
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130 | public static Character toCharacterObject(String str) {
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131 | if (StringUtils.isEmpty(str)) {
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132 | return null;
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133 | }
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134 | return toCharacterObject(str.charAt(0));
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135 | }
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136 |
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137 | //-----------------------------------------------------------------------
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138 | /**
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139 | * <p>Converts the Character to a char throwing an exception for <code>null</code>.</p>
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140 | *
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141 | * <pre>
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142 | * CharUtils.toChar(null) = IllegalArgumentException
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143 | * CharUtils.toChar(' ') = ' '
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144 | * CharUtils.toChar('A') = 'A'
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145 | * </pre>
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146 | *
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147 | * @param ch the character to convert
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148 | * @return the char value of the Character
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149 | * @throws IllegalArgumentException if the Character is null
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150 | */
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151 | public static char toChar(Character ch) {
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152 | if (ch == null) {
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153 | throw new IllegalArgumentException("The Character must not be null");
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154 | }
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155 | return ch.charValue();
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156 | }
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157 |
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158 | /**
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159 | * <p>Converts the Character to a char handling <code>null</code>.</p>
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160 | *
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161 | * <pre>
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162 | * CharUtils.toChar(null, 'X') = 'X'
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163 | * CharUtils.toChar(' ', 'X') = ' '
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164 | * CharUtils.toChar('A', 'X') = 'A'
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165 | * </pre>
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166 | *
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167 | * @param ch the character to convert
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168 | * @param defaultValue the value to use if the Character is null
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169 | * @return the char value of the Character or the default if null
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170 | */
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171 | public static char toChar(Character ch, char defaultValue) {
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172 | if (ch == null) {
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173 | return defaultValue;
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174 | }
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175 | return ch.charValue();
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176 | }
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177 |
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178 | //-----------------------------------------------------------------------
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179 | /**
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180 | * <p>Converts the String to a char using the first character, throwing
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181 | * an exception on empty Strings.</p>
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182 | *
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183 | * <pre>
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184 | * CharUtils.toChar(null) = IllegalArgumentException
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185 | * CharUtils.toChar("") = IllegalArgumentException
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186 | * CharUtils.toChar("A") = 'A'
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187 | * CharUtils.toChar("BA") = 'B'
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188 | * </pre>
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189 | *
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190 | * @param str the character to convert
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191 | * @return the char value of the first letter of the String
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192 | * @throws IllegalArgumentException if the String is empty
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193 | */
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194 | public static char toChar(String str) {
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195 | if (StringUtils.isEmpty(str)) {
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196 | throw new IllegalArgumentException("The String must not be empty");
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197 | }
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198 | return str.charAt(0);
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199 | }
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200 |
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201 | /**
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202 | * <p>Converts the String to a char using the first character, defaulting
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203 | * the value on empty Strings.</p>
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204 | *
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205 | * <pre>
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206 | * CharUtils.toChar(null, 'X') = 'X'
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207 | * CharUtils.toChar("", 'X') = 'X'
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208 | * CharUtils.toChar("A", 'X') = 'A'
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209 | * CharUtils.toChar("BA", 'X') = 'B'
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210 | * </pre>
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211 | *
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212 | * @param str the character to convert
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213 | * @param defaultValue the value to use if the Character is null
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214 | * @return the char value of the first letter of the String or the default if null
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215 | */
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216 | public static char toChar(String str, char defaultValue) {
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217 | if (StringUtils.isEmpty(str)) {
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218 | return defaultValue;
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219 | }
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220 | return str.charAt(0);
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221 | }
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222 |
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223 | //-----------------------------------------------------------------------
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224 | /**
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225 | * <p>Converts the character to the Integer it represents, throwing an
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226 | * exception if the character is not numeric.</p>
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227 | *
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228 | * <p>This method coverts the char '1' to the int 1 and so on.</p>
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229 | *
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230 | * <pre>
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231 | * CharUtils.toIntValue('3') = 3
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232 | * CharUtils.toIntValue('A') = IllegalArgumentException
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233 | * </pre>
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234 | *
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235 | * @param ch the character to convert
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236 | * @return the int value of the character
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237 | * @throws IllegalArgumentException if the character is not ASCII numeric
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238 | */
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239 | public static int toIntValue(char ch) {
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240 | if (isAsciiNumeric(ch) == false) {
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241 | throw new IllegalArgumentException("The character " + ch + " is not in the range '0' - '9'");
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242 | }
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243 | return ch - 48;
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244 | }
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245 |
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246 | /**
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247 | * <p>Converts the character to the Integer it represents, throwing an
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248 | * exception if the character is not numeric.</p>
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249 | *
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250 | * <p>This method coverts the char '1' to the int 1 and so on.</p>
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251 | *
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252 | * <pre>
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253 | * CharUtils.toIntValue('3', -1) = 3
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254 | * CharUtils.toIntValue('A', -1) = -1
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255 | * </pre>
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256 | *
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257 | * @param ch the character to convert
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258 | * @param defaultValue the default value to use if the character is not numeric
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259 | * @return the int value of the character
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260 | */
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261 | public static int toIntValue(char ch, int defaultValue) {
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262 | if (isAsciiNumeric(ch) == false) {
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263 | return defaultValue;
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264 | }
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265 | return ch - 48;
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266 | }
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267 |
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268 | /**
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269 | * <p>Converts the character to the Integer it represents, throwing an
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270 | * exception if the character is not numeric.</p>
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271 | *
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272 | * <p>This method coverts the char '1' to the int 1 and so on.</p>
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273 | *
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274 | * <pre>
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275 | * CharUtils.toIntValue(null) = IllegalArgumentException
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276 | * CharUtils.toIntValue('3') = 3
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277 | * CharUtils.toIntValue('A') = IllegalArgumentException
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278 | * </pre>
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279 | *
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280 | * @param ch the character to convert, not null
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281 | * @return the int value of the character
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282 | * @throws IllegalArgumentException if the Character is not ASCII numeric or is null
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283 | */
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284 | public static int toIntValue(Character ch) {
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285 | if (ch == null) {
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286 | throw new IllegalArgumentException("The character must not be null");
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287 | }
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288 | return toIntValue(ch.charValue());
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289 | }
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290 |
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291 | /**
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292 | * <p>Converts the character to the Integer it represents, throwing an
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293 | * exception if the character is not numeric.</p>
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294 | *
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295 | * <p>This method coverts the char '1' to the int 1 and so on.</p>
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296 | *
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297 | * <pre>
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298 | * CharUtils.toIntValue(null, -1) = -1
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299 | * CharUtils.toIntValue('3', -1) = 3
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300 | * CharUtils.toIntValue('A', -1) = -1
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301 | * </pre>
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302 | *
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303 | * @param ch the character to convert
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304 | * @param defaultValue the default value to use if the character is not numeric
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305 | * @return the int value of the character
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306 | */
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307 | public static int toIntValue(Character ch, int defaultValue) {
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308 | if (ch == null) {
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309 | return defaultValue;
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310 | }
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311 | return toIntValue(ch.charValue(), defaultValue);
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312 | }
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313 |
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314 | //-----------------------------------------------------------------------
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315 | /**
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316 | * <p>Converts the character to a String that contains the one character.</p>
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317 | *
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318 | * <p>For ASCII 7 bit characters, this uses a cache that will return the
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319 | * same String object each time.</p>
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320 | *
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321 | * <pre>
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322 | * CharUtils.toString(' ') = " "
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323 | * CharUtils.toString('A') = "A"
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324 | * </pre>
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325 | *
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326 | * @param ch the character to convert
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327 | * @return a String containing the one specified character
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328 | */
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329 | public static String toString(char ch) {
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330 | if (ch < 128) {
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331 | return CHAR_STRING_ARRAY[ch];
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332 | }
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333 | return new String(new char[] {ch});
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334 | }
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335 |
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336 | /**
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337 | * <p>Converts the character to a String that contains the one character.</p>
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338 | *
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339 | * <p>For ASCII 7 bit characters, this uses a cache that will return the
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340 | * same String object each time.</p>
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341 | *
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342 | * <p>If <code>null</code> is passed in, <code>null</code> will be returned.</p>
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343 | *
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344 | * <pre>
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345 | * CharUtils.toString(null) = null
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346 | * CharUtils.toString(' ') = " "
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347 | * CharUtils.toString('A') = "A"
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348 | * </pre>
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349 | *
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350 | * @param ch the character to convert
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351 | * @return a String containing the one specified character
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352 | */
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353 | public static String toString(Character ch) {
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354 | if (ch == null) {
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355 | return null;
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356 | }
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357 | return toString(ch.charValue());
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358 | }
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359 |
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360 | //--------------------------------------------------------------------------
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361 | /**
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362 | * <p>Converts the string to the unicode format '\u0020'.</p>
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363 | *
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364 | * <p>This format is the Java source code format.</p>
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365 | *
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366 | * <pre>
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367 | * CharUtils.unicodeEscaped(' ') = "\u0020"
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368 | * CharUtils.unicodeEscaped('A') = "\u0041"
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369 | * </pre>
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370 | *
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371 | * @param ch the character to convert
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372 | * @return the escaped unicode string
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373 | */
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374 | public static String unicodeEscaped(char ch) {
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375 | if (ch < 0x10) {
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376 | return "\\u000" + Integer.toHexString(ch);
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377 | } else if (ch < 0x100) {
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378 | return "\\u00" + Integer.toHexString(ch);
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379 | } else if (ch < 0x1000) {
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380 | return "\\u0" + Integer.toHexString(ch);
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381 | }
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382 | return "\\u" + Integer.toHexString(ch);
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383 | }
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384 |
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385 | /**
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386 | * <p>Converts the string to the unicode format '\u0020'.</p>
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387 | *
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388 | * <p>This format is the Java source code format.</p>
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389 | *
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390 | * <p>If <code>null</code> is passed in, <code>null</code> will be returned.</p>
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391 | *
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392 | * <pre>
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393 | * CharUtils.unicodeEscaped(null) = null
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394 | * CharUtils.unicodeEscaped(' ') = "\u0020"
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395 | * CharUtils.unicodeEscaped('A') = "\u0041"
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396 | * </pre>
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397 | *
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398 | * @param ch the character to convert, may be null
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399 | * @return the escaped unicode string, null if null input
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400 | */
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401 | public static String unicodeEscaped(Character ch) {
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402 | if (ch == null) {
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403 | return null;
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404 | }
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405 | return unicodeEscaped(ch.charValue());
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406 | }
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407 |
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408 | //--------------------------------------------------------------------------
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409 | /**
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410 | * <p>Checks whether the character is ASCII 7 bit.</p>
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411 | *
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412 | * <pre>
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413 | * CharUtils.isAscii('a') = true
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414 | * CharUtils.isAscii('A') = true
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415 | * CharUtils.isAscii('3') = true
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416 | * CharUtils.isAscii('-') = true
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417 | * CharUtils.isAscii('\n') = true
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418 | * CharUtils.isAscii('©') = false
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419 | * </pre>
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420 | *
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421 | * @param ch the character to check
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422 | * @return true if less than 128
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423 | */
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424 | public static boolean isAscii(char ch) {
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425 | return ch < 128;
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426 | }
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427 |
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428 | /**
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429 | * <p>Checks whether the character is ASCII 7 bit printable.</p>
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430 | *
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431 | * <pre>
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432 | * CharUtils.isAsciiPrintable('a') = true
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433 | * CharUtils.isAsciiPrintable('A') = true
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434 | * CharUtils.isAsciiPrintable('3') = true
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435 | * CharUtils.isAsciiPrintable('-') = true
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436 | * CharUtils.isAsciiPrintable('\n') = false
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437 | * CharUtils.isAsciiPrintable('©') = false
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438 | * </pre>
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439 | *
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440 | * @param ch the character to check
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441 | * @return true if between 32 and 126 inclusive
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442 | */
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443 | public static boolean isAsciiPrintable(char ch) {
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444 | return ch >= 32 && ch < 127;
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---|
445 | }
|
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446 |
|
---|
447 | /**
|
---|
448 | * <p>Checks whether the character is ASCII 7 bit control.</p>
|
---|
449 | *
|
---|
450 | * <pre>
|
---|
451 | * CharUtils.isAsciiControl('a') = false
|
---|
452 | * CharUtils.isAsciiControl('A') = false
|
---|
453 | * CharUtils.isAsciiControl('3') = false
|
---|
454 | * CharUtils.isAsciiControl('-') = false
|
---|
455 | * CharUtils.isAsciiControl('\n') = true
|
---|
456 | * CharUtils.isAsciiControl('©') = false
|
---|
457 | * </pre>
|
---|
458 | *
|
---|
459 | * @param ch the character to check
|
---|
460 | * @return true if less than 32 or equals 127
|
---|
461 | */
|
---|
462 | public static boolean isAsciiControl(char ch) {
|
---|
463 | return ch < 32 || ch == 127;
|
---|
464 | }
|
---|
465 |
|
---|
466 | /**
|
---|
467 | * <p>Checks whether the character is ASCII 7 bit alphabetic.</p>
|
---|
468 | *
|
---|
469 | * <pre>
|
---|
470 | * CharUtils.isAsciiAlpha('a') = true
|
---|
471 | * CharUtils.isAsciiAlpha('A') = true
|
---|
472 | * CharUtils.isAsciiAlpha('3') = false
|
---|
473 | * CharUtils.isAsciiAlpha('-') = false
|
---|
474 | * CharUtils.isAsciiAlpha('\n') = false
|
---|
475 | * CharUtils.isAsciiAlpha('©') = false
|
---|
476 | * </pre>
|
---|
477 | *
|
---|
478 | * @param ch the character to check
|
---|
479 | * @return true if between 65 and 90 or 97 and 122 inclusive
|
---|
480 | */
|
---|
481 | public static boolean isAsciiAlpha(char ch) {
|
---|
482 | return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
|
---|
483 | }
|
---|
484 |
|
---|
485 | /**
|
---|
486 | * <p>Checks whether the character is ASCII 7 bit alphabetic upper case.</p>
|
---|
487 | *
|
---|
488 | * <pre>
|
---|
489 | * CharUtils.isAsciiAlphaUpper('a') = false
|
---|
490 | * CharUtils.isAsciiAlphaUpper('A') = true
|
---|
491 | * CharUtils.isAsciiAlphaUpper('3') = false
|
---|
492 | * CharUtils.isAsciiAlphaUpper('-') = false
|
---|
493 | * CharUtils.isAsciiAlphaUpper('\n') = false
|
---|
494 | * CharUtils.isAsciiAlphaUpper('©') = false
|
---|
495 | * </pre>
|
---|
496 | *
|
---|
497 | * @param ch the character to check
|
---|
498 | * @return true if between 65 and 90 inclusive
|
---|
499 | */
|
---|
500 | public static boolean isAsciiAlphaUpper(char ch) {
|
---|
501 | return ch >= 'A' && ch <= 'Z';
|
---|
502 | }
|
---|
503 |
|
---|
504 | /**
|
---|
505 | * <p>Checks whether the character is ASCII 7 bit alphabetic lower case.</p>
|
---|
506 | *
|
---|
507 | * <pre>
|
---|
508 | * CharUtils.isAsciiAlphaLower('a') = true
|
---|
509 | * CharUtils.isAsciiAlphaLower('A') = false
|
---|
510 | * CharUtils.isAsciiAlphaLower('3') = false
|
---|
511 | * CharUtils.isAsciiAlphaLower('-') = false
|
---|
512 | * CharUtils.isAsciiAlphaLower('\n') = false
|
---|
513 | * CharUtils.isAsciiAlphaLower('©') = false
|
---|
514 | * </pre>
|
---|
515 | *
|
---|
516 | * @param ch the character to check
|
---|
517 | * @return true if between 97 and 122 inclusive
|
---|
518 | */
|
---|
519 | public static boolean isAsciiAlphaLower(char ch) {
|
---|
520 | return ch >= 'a' && ch <= 'z';
|
---|
521 | }
|
---|
522 |
|
---|
523 | /**
|
---|
524 | * <p>Checks whether the character is ASCII 7 bit numeric.</p>
|
---|
525 | *
|
---|
526 | * <pre>
|
---|
527 | * CharUtils.isAsciiNumeric('a') = false
|
---|
528 | * CharUtils.isAsciiNumeric('A') = false
|
---|
529 | * CharUtils.isAsciiNumeric('3') = true
|
---|
530 | * CharUtils.isAsciiNumeric('-') = false
|
---|
531 | * CharUtils.isAsciiNumeric('\n') = false
|
---|
532 | * CharUtils.isAsciiNumeric('©') = false
|
---|
533 | * </pre>
|
---|
534 | *
|
---|
535 | * @param ch the character to check
|
---|
536 | * @return true if between 48 and 57 inclusive
|
---|
537 | */
|
---|
538 | public static boolean isAsciiNumeric(char ch) {
|
---|
539 | return ch >= '0' && ch <= '9';
|
---|
540 | }
|
---|
541 |
|
---|
542 | /**
|
---|
543 | * <p>Checks whether the character is ASCII 7 bit numeric.</p>
|
---|
544 | *
|
---|
545 | * <pre>
|
---|
546 | * CharUtils.isAsciiAlphanumeric('a') = true
|
---|
547 | * CharUtils.isAsciiAlphanumeric('A') = true
|
---|
548 | * CharUtils.isAsciiAlphanumeric('3') = true
|
---|
549 | * CharUtils.isAsciiAlphanumeric('-') = false
|
---|
550 | * CharUtils.isAsciiAlphanumeric('\n') = false
|
---|
551 | * CharUtils.isAsciiAlphanumeric('©') = false
|
---|
552 | * </pre>
|
---|
553 | *
|
---|
554 | * @param ch the character to check
|
---|
555 | * @return true if between 48 and 57 or 65 and 90 or 97 and 122 inclusive
|
---|
556 | */
|
---|
557 | public static boolean isAsciiAlphanumeric(char ch) {
|
---|
558 | return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9');
|
---|
559 | }
|
---|
560 |
|
---|
561 | // ----------------- Following code copied from Apache Harmony (Character class)
|
---|
562 | /**
|
---|
563 | * Indicates whether {@code ch} is a high- (or leading-) surrogate code unit
|
---|
564 | * that is used for representing supplementary characters in UTF-16
|
---|
565 | * encoding.
|
---|
566 | *
|
---|
567 | * @param ch
|
---|
568 | * the character to test.
|
---|
569 | * @return {@code true} if {@code ch} is a high-surrogate code unit;
|
---|
570 | * {@code false} otherwise.
|
---|
571 | */
|
---|
572 | static boolean isHighSurrogate(char ch) {
|
---|
573 | return ('\uD800' <= ch && '\uDBFF' >= ch);
|
---|
574 | }
|
---|
575 |
|
---|
576 | }
|
---|