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org.apache.commons.configuration.ConfigurationMap$ConfigurationSet$Entry |
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1 | /* |
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2 | * Copyright 2004 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 | * @todo This implementation is incomplete. |
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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: 155408 $, $Date: 2005-02-26 13:56:39 +0100 (Sa, 26 Feb 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 | Configuration configuration = null; |
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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 | * @see java.util.Map#entrySet() |
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58 | */ |
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59 | public Set entrySet() |
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60 | { |
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61 | return new ConfigurationSet(configuration); |
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62 | } |
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63 | ||
64 | /** |
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65 | * @see java.util.Map#put(java.lang.Object, java.lang.Object) |
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66 | */ |
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67 | public Object put(Object key, Object value) |
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68 | { |
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69 | String strKey = String.valueOf(key); |
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70 | Object old = configuration.getProperty(strKey); |
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71 | configuration.setProperty(strKey, value); |
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72 | return old; |
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73 | } |
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74 | ||
75 | /** |
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76 | * @see java.util.Map#get(java.lang.Object) |
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77 | */ |
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78 | public Object get(Object key) |
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79 | { |
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80 | return configuration.getProperty(String.valueOf(key)); |
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81 | } |
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82 | ||
83 | static class ConfigurationSet extends AbstractSet |
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84 | { |
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85 | private Configuration configuration = null; |
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86 | ||
87 | 161 | private class Entry implements Map.Entry |
88 | { |
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89 | 161 | private Object key = null; |
90 | ||
91 | private Entry(Object key) |
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92 | 161 | { |
93 | 161 | this.key = key; |
94 | 161 | } |
95 | ||
96 | public Object getKey() |
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97 | { |
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98 | 1288 | return key; |
99 | } |
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100 | ||
101 | public Object getValue() |
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102 | { |
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103 | 161 | return configuration.getProperty((String) key); |
104 | } |
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105 | ||
106 | public Object setValue(Object value) |
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107 | { |
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108 | 0 | Object old = getValue(); |
109 | 0 | configuration.setProperty((String) key, value); |
110 | 0 | return old; |
111 | } |
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112 | ||
113 | } |
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114 | ||
115 | private class ConfigurationSetIterator implements Iterator |
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116 | { |
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117 | private Iterator keys; |
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118 | ||
119 | private ConfigurationSetIterator() |
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120 | { |
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121 | keys = configuration.getKeys(); |
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122 | } |
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123 | ||
124 | public boolean hasNext() |
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125 | { |
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126 | return keys.hasNext(); |
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127 | } |
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128 | ||
129 | public Object next() |
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130 | { |
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131 | return new Entry(keys.next()); |
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132 | } |
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133 | ||
134 | public void remove() |
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135 | { |
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136 | keys.remove(); |
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137 | } |
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138 | ||
139 | } |
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140 | ||
141 | ConfigurationSet(Configuration configuration) |
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142 | { |
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143 | this.configuration = configuration; |
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144 | } |
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145 | ||
146 | /** |
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147 | * @see java.util.Collection#size() |
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148 | */ |
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149 | public int size() |
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150 | { |
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151 | // Ouch. Now _that_ one is expensive... |
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152 | int count = 0; |
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153 | for (Iterator iterator = configuration.getKeys(); iterator.hasNext(); ) |
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154 | { |
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155 | iterator.next(); |
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156 | count++; |
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157 | } |
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158 | return count; |
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159 | } |
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160 | ||
161 | /** |
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162 | * @see java.util.Collection#iterator() |
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163 | */ |
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164 | public Iterator iterator() |
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165 | { |
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166 | return new ConfigurationSetIterator(); |
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167 | } |
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168 | } |
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169 | } |
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