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org.apache.commons.configuration.ConfigurationMap$ConfigurationSet$Entry |
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1 | /* |
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2 | * Copyright 2001-2004 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 | ||
26 | /** |
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27 | * <p>The <code>ConfigurationMap</code> wraps a |
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28 | * configuration-collection |
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29 | * {@link org.apache.commons.configuration.Configuration} |
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30 | * instance to provide a <code>Map</code> interface.</p> |
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31 | * |
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32 | * @todo This implementation is incomplete. |
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33 | * |
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34 | * @author <a href="mailto:ricardo.gladwell@btinternet.com">Ricardo Gladwell</a> |
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35 | */ |
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36 | ||
37 | public class ConfigurationMap |
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38 | extends AbstractMap |
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39 | { |
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40 | ||
41 | /** |
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42 | * The <code>Configuration</code> wrapped by this class. |
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43 | */ |
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44 | Configuration configuration = null; |
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45 | ||
46 | /** |
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47 | * Creates a new instance of a <code>ConfigurationMap</code> |
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48 | * that wraps the specified <code>Configuration</code> |
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49 | * instance. |
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50 | * @param configuration <code>Configuration</code> |
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51 | * instance. |
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52 | */ |
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53 | public ConfigurationMap(Configuration configuration) |
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54 | { |
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55 | this.configuration = configuration; |
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56 | } |
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57 | ||
58 | /** |
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59 | * @see java.util.Map#entrySet() |
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60 | */ |
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61 | public Set entrySet() |
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62 | { |
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63 | return new ConfigurationSet(configuration); |
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64 | } |
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65 | ||
66 | /** |
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67 | * @see java.util.Map#put(java.lang.Object, java.lang.Object) |
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68 | */ |
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69 | public Object put(Object key, Object value) |
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70 | { |
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71 | String strKey = String.valueOf(key); |
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72 | Object old = configuration.getProperty(strKey); |
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73 | configuration.setProperty(strKey, value); |
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74 | return old; |
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75 | } |
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76 | ||
77 | /** |
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78 | * @see java.util.Map#get(java.lang.Object) |
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79 | */ |
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80 | public Object get(Object key) |
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81 | { |
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82 | return configuration.getProperty(String.valueOf(key)); |
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83 | } |
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84 | ||
85 | static class ConfigurationSet |
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86 | extends AbstractSet |
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87 | { |
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88 | private Configuration configuration = null; |
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89 | ||
90 | 7 | private class Entry |
91 | implements Map.Entry |
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92 | { |
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93 | 7 | private Object key = null; |
94 | ||
95 | private Entry(Object key) |
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96 | 7 | { |
97 | 7 | this.key = key; |
98 | 7 | } |
99 | ||
100 | public Object getKey() |
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101 | { |
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102 | 56 | return key; |
103 | } |
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104 | ||
105 | public Object getValue() |
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106 | { |
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107 | 7 | return configuration.getProperty((String) key); |
108 | } |
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109 | ||
110 | public Object setValue(Object value) |
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111 | { |
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112 | 0 | Object old = getValue(); |
113 | 0 | configuration.setProperty((String) key, value); |
114 | 0 | return old; |
115 | } |
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116 | ||
117 | } |
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118 | ||
119 | private class ConfigurationSetIterator |
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120 | implements Iterator |
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121 | { |
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122 | private Iterator keys; |
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123 | ||
124 | private ConfigurationSetIterator() |
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125 | { |
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126 | keys = configuration.getKeys(); |
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127 | } |
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128 | ||
129 | public boolean hasNext() |
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130 | { |
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131 | return keys.hasNext(); |
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132 | } |
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133 | ||
134 | public Object next() |
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135 | { |
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136 | return new Entry(keys.next()); |
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137 | } |
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138 | ||
139 | public void remove() |
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140 | { |
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141 | keys.remove(); |
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142 | } |
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143 | ||
144 | } |
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145 | ||
146 | ConfigurationSet(Configuration configuration) |
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147 | { |
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148 | this.configuration = configuration; |
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149 | } |
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150 | ||
151 | /** |
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152 | * @see java.util.Collection#size() |
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153 | */ |
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154 | public int size() |
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155 | { |
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156 | // Ouch. Now _that_ one is expensive... |
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157 | int count = 0; |
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158 | for (Iterator iterator = configuration.getKeys(); iterator.hasNext(); ) |
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159 | { |
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160 | iterator.next(); |
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161 | count++; |
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162 | } |
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163 | return count; |
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164 | } |
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165 | ||
166 | /** |
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167 | * @see java.util.Collection#iterator() |
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168 | */ |
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169 | public Iterator iterator() |
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170 | { |
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171 | return new ConfigurationSetIterator(); |
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172 | } |
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173 | } |
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174 | } |
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