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org.apache.commons.configuration.ConfigurationMap$ConfigurationSet |
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1 | /* |
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2 | * Copyright 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 | ||
17 | package org.apache.commons.configuration; |
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18 | ||
19 | import java.util.AbstractMap; |
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20 | import java.util.AbstractSet; |
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21 | import java.util.Iterator; |
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22 | import java.util.Map; |
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23 | import java.util.Set; |
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24 | ||
25 | /** |
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26 | * <p>The <code>ConfigurationMap</code> wraps a |
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27 | * configuration-collection |
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28 | * {@link org.apache.commons.configuration.Configuration} |
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29 | * instance to provide a <code>Map</code> interface.</p> |
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30 | * |
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31 | * <p><em>Note:</em> This implementation is incomplete.</p> |
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32 | * |
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33 | * @author <a href="mailto:ricardo.gladwell@btinternet.com">Ricardo Gladwell</a> |
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34 | * @version $Revision$, $Date: 2005-12-06 04:10:27 +0100 (Tue, 06 Dec 2005) $ |
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35 | * @since 1.0 |
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36 | */ |
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37 | public class ConfigurationMap extends AbstractMap |
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38 | { |
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39 | /** |
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40 | * The <code>Configuration</code> wrapped by this class. |
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41 | */ |
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42 | private Configuration configuration; |
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43 | ||
44 | /** |
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45 | * Creates a new instance of a <code>ConfigurationMap</code> |
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46 | * that wraps the specified <code>Configuration</code> |
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47 | * instance. |
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48 | * @param configuration <code>Configuration</code> |
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49 | * instance. |
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50 | */ |
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51 | public ConfigurationMap(Configuration configuration) |
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52 | { |
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53 | this.configuration = configuration; |
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54 | } |
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55 | ||
56 | /** |
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57 | * Returns the wrapped <code>Configuration</code> object. |
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58 | * |
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59 | * @return the wrapped configuration |
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60 | * @since 1.2 |
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61 | */ |
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62 | public Configuration getConfiguration() |
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63 | { |
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64 | return configuration; |
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65 | } |
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66 | ||
67 | /** |
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68 | * @see java.util.Map#entrySet() |
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69 | */ |
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70 | public Set entrySet() |
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71 | { |
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72 | return new ConfigurationSet(configuration); |
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73 | } |
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74 | ||
75 | /** |
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76 | * @see java.util.Map#put(java.lang.Object, java.lang.Object) |
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77 | */ |
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78 | public Object put(Object key, Object value) |
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79 | { |
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80 | String strKey = String.valueOf(key); |
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81 | Object old = configuration.getProperty(strKey); |
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82 | configuration.setProperty(strKey, value); |
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83 | return old; |
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84 | } |
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85 | ||
86 | /** |
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87 | * @see java.util.Map#get(java.lang.Object) |
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88 | */ |
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89 | public Object get(Object key) |
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90 | { |
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91 | return configuration.getProperty(String.valueOf(key)); |
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92 | } |
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93 | ||
94 | 8 | /** |
95 | * Set of entries in the map. |
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96 | */ |
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97 | 16 | static class ConfigurationSet extends AbstractSet |
98 | { |
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99 | /** The configuration mapped to this entry set. */ |
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100 | private Configuration configuration; |
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101 | ||
102 | /** |
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103 | * A Map entry in the ConfigurationMap. |
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104 | */ |
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105 | private final class Entry implements Map.Entry |
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106 | { |
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107 | /** The key of the map entry. */ |
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108 | private Object key; |
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109 | ||
110 | private Entry(Object key) |
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111 | { |
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112 | this.key = key; |
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113 | } |
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114 | ||
115 | public Object getKey() |
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116 | { |
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117 | return key; |
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118 | } |
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119 | ||
120 | public Object getValue() |
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121 | { |
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122 | return configuration.getProperty((String) key); |
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123 | } |
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124 | ||
125 | public Object setValue(Object value) |
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126 | { |
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127 | Object old = getValue(); |
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128 | configuration.setProperty((String) key, value); |
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129 | return old; |
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130 | } |
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131 | } |
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132 | ||
133 | /** |
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134 | * Iterator over the entries in the ConfigurationMap. |
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135 | */ |
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136 | private final class ConfigurationSetIterator implements Iterator |
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137 | { |
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138 | /** An iterator over the keys in the configuration. */ |
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139 | private Iterator keys; |
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140 | ||
141 | private ConfigurationSetIterator() |
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142 | { |
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143 | keys = configuration.getKeys(); |
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144 | } |
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145 | ||
146 | public boolean hasNext() |
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147 | { |
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148 | return keys.hasNext(); |
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149 | } |
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150 | ||
151 | public Object next() |
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152 | { |
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153 | 2 | return new Entry(keys.next()); |
154 | 2 | } |
155 | 2 | |
156 | public void remove() |
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157 | { |
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158 | keys.remove(); |
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159 | } |
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160 | } |
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161 | ||
162 | ConfigurationSet(Configuration configuration) |
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163 | 6 | { |
164 | 15 | this.configuration = configuration; |
165 | 4 | } |
166 | 7 | |
167 | 7 | /** |
168 | * @see java.util.Collection#size() |
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169 | 2 | */ |
170 | public int size() |
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171 | { |
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172 | // Ouch. Now _that_ one is expensive... |
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173 | 4 | int count = 0; |
174 | 22 | for (Iterator iterator = configuration.getKeys(); iterator.hasNext();) |
175 | { |
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176 | 14 | iterator.next(); |
177 | 15 | count++; |
178 | } |
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179 | 4 | return count; |
180 | } |
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181 | ||
182 | /** |
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183 | * @see java.util.Collection#iterator() |
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184 | */ |
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185 | public Iterator iterator() |
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186 | { |
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187 | 2 | return new ConfigurationSetIterator(); |
188 | } |
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189 | } |
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190 | } |
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