1 | /*
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2 | * Copyright 2002,2004-2005 The Apache Software Foundation
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | *
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16 | */
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17 | package org.apache.tools.ant.taskdefs.optional.extension;
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18 |
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19 | import java.util.StringTokenizer;
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20 |
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21 | /**
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22 | * Utility class to contain version numbers in "Dewey Decimal"
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23 | * syntax. Numbers in the "Dewey Decimal" syntax consist of positive
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24 | * decimal integers separated by periods ".". For example, "2.0" or
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25 | * "1.2.3.4.5.6.7". This allows an extensible number to be used to
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26 | * represent major, minor, micro, etc versions. The version number
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27 | * must begin with a number.
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28 | *
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29 | */
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30 | public final class DeweyDecimal {
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31 | /** Array of components that make up DeweyDecimal */
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32 | private int[] components;
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33 |
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34 | /**
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35 | * Construct a DeweyDecimal from an array of integer components.
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36 | *
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37 | * @param components an array of integer components.
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38 | */
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39 | public DeweyDecimal(final int[] components) {
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40 | this.components = new int[components.length];
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41 |
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42 | for (int i = 0; i < components.length; i++) {
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43 | this.components[i] = components[i];
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44 | }
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45 | }
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46 |
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47 | /**
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48 | * Construct a DeweyDecimal from string in DeweyDecimal format.
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49 | *
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50 | * @param string the string in dewey decimal format
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51 | * @exception NumberFormatException if string is malformed
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52 | */
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53 | public DeweyDecimal(final String string)
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54 | throws NumberFormatException {
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55 | final StringTokenizer tokenizer = new StringTokenizer(string, ".", true);
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56 | final int size = tokenizer.countTokens();
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57 |
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58 | components = new int[ (size + 1) / 2 ];
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59 |
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60 | for (int i = 0; i < components.length; i++) {
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61 | final String component = tokenizer.nextToken();
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62 | if (component.equals("")) {
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63 | throw new NumberFormatException("Empty component in string");
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64 | }
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65 |
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66 | components[ i ] = Integer.parseInt(component);
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67 |
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68 | //Strip '.' token
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69 | if (tokenizer.hasMoreTokens()) {
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70 | tokenizer.nextToken();
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71 |
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72 | //If it ended in a dot, throw an exception
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73 | if (!tokenizer.hasMoreTokens()) {
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74 | throw new NumberFormatException("DeweyDecimal ended in a '.'");
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75 | }
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76 | }
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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 | * Return number of components in <code>DeweyDecimal</code>.
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82 | *
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83 | * @return the number of components in dewey decimal
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84 | */
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85 | public int getSize() {
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86 | return components.length;
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87 | }
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88 |
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89 | /**
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90 | * Return the component at specified index.
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91 | *
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92 | * @param index the index of components
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93 | * @return the value of component at index
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94 | */
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95 | public int get(final int index) {
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96 | return components[ index ];
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97 | }
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98 |
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99 | /**
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100 | * Return <code>true</code> if this <code>DeweyDecimal</code> is
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101 | * equal to the other <code>DeweyDecimal</code>.
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102 | *
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103 | * @param other the other DeweyDecimal
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104 | * @return true if equal to other DeweyDecimal, false otherwise
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105 | */
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106 | public boolean isEqual(final DeweyDecimal other) {
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107 | final int max = Math.max(other.components.length, components.length);
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108 |
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109 | for (int i = 0; i < max; i++) {
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110 | final int component1 = (i < components.length) ? components[ i ] : 0;
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111 | final int component2 = (i < other.components.length) ? other.components[ i ] : 0;
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112 |
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113 | if (component2 != component1) {
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114 | return false;
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115 | }
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116 | }
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117 |
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118 | return true; // Exact match
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119 | }
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120 |
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121 | /**
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122 | * Return <code>true</code> if this <code>DeweyDecimal</code> is
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123 | * less than the other <code>DeweyDecimal</code>.
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124 | *
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125 | * @param other the other DeweyDecimal
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126 | * @return true if less than other DeweyDecimal, false otherwise
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127 | */
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128 | public boolean isLessThan(final DeweyDecimal other) {
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129 | return !isGreaterThanOrEqual(other);
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130 | }
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131 |
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132 | /**
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133 | * Return <code>true</code> if this <code>DeweyDecimal</code> is
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134 | * less than or equal to the other <code>DeweyDecimal</code>.
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135 | *
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136 | * @param other the other DeweyDecimal
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137 | * @return true if less than or equal to other DeweyDecimal, false otherwise
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138 | */
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139 | public boolean isLessThanOrEqual(final DeweyDecimal other) {
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140 | return !isGreaterThan(other);
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141 | }
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142 |
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143 | /**
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144 | * Return <code>true</code> if this <code>DeweyDecimal</code> is
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145 | * greater than the other <code>DeweyDecimal</code>.
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146 | *
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147 | * @param other the other DeweyDecimal
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148 | * @return true if greater than other DeweyDecimal, false otherwise
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149 | */
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150 | public boolean isGreaterThan(final DeweyDecimal other) {
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151 | final int max = Math.max(other.components.length, components.length);
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152 |
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153 | for (int i = 0; i < max; i++) {
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154 | final int component1 = (i < components.length) ? components[ i ] : 0;
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155 | final int component2 = (i < other.components.length) ? other.components[ i ] : 0;
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156 |
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157 | if (component2 > component1) {
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158 | return false;
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159 | }
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160 | if (component2 < component1) {
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161 | return true;
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162 | }
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163 | }
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164 |
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165 | return false; // Exact match
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166 | }
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167 |
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168 | /**
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169 | * Return <code>true</code> if this <code>DeweyDecimal</code> is
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170 | * greater than or equal to the other <code>DeweyDecimal</code>.
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171 | *
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172 | * @param other the other DeweyDecimal
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173 | * @return true if greater than or equal to other DeweyDecimal, false otherwise
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174 | */
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175 | public boolean isGreaterThanOrEqual(final DeweyDecimal other) {
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176 | final int max = Math.max(other.components.length, components.length);
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177 |
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178 | for (int i = 0; i < max; i++) {
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179 | final int component1 = (i < components.length) ? components[ i ] : 0;
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180 | final int component2 = (i < other.components.length) ? other.components[ i ] : 0;
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181 |
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182 | if (component2 > component1) {
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183 | return false;
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184 | }
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185 | if (component2 < component1) {
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186 | return true;
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187 | }
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188 | }
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189 |
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190 | return true; // Exact match
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191 | }
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192 |
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193 | /**
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194 | * Return string representation of <code>DeweyDecimal</code>.
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195 | *
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196 | * @return the string representation of DeweyDecimal.
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197 | */
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198 | public String toString() {
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199 | final StringBuffer sb = new StringBuffer();
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200 |
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201 | for (int i = 0; i < components.length; i++) {
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202 | if (i != 0) {
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203 | sb.append('.');
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204 | }
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205 | sb.append(components[ i ]);
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206 | }
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207 |
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208 | return sb.toString();
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209 | }
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210 | }
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