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| org.apache.commons.configuration.SubsetConfiguration$1 |
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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.Iterator; |
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| 20 | ||
| 21 | import org.apache.commons.collections.Transformer; |
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| 22 | import org.apache.commons.collections.iterators.TransformIterator; |
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| 23 | ||
| 24 | /** |
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| 25 | * A subset of another configuration. The new Configuration object contains |
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| 26 | * every key from the parent Configuration that starts with prefix. The prefix |
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| 27 | * is removed from the keys in the subset. |
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| 28 | * |
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| 29 | * @see Configuration#subset(String) |
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| 30 | * |
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| 31 | * @author Emmanuel Bourg |
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| 32 | * @version $Revision: 1.6 $, $Date: 2004/10/05 21:17:25 $ |
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| 33 | */ |
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| 34 | public class SubsetConfiguration extends AbstractConfiguration |
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| 35 | { |
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| 36 | /** The parent configuration. */ |
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| 37 | protected Configuration parent; |
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| 38 | ||
| 39 | /** The prefix used to select the properties. */ |
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| 40 | protected String prefix; |
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| 41 | ||
| 42 | /** The prefix delimiter */ |
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| 43 | protected String delimiter; |
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| 44 | ||
| 45 | /** |
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| 46 | * Create a subset of the specified configuration |
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| 47 | * |
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| 48 | * @param parent The parent configuration |
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| 49 | * @param prefix The prefix used to select the properties |
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| 50 | */ |
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| 51 | public SubsetConfiguration(Configuration parent, String prefix) |
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| 52 | { |
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| 53 | this.parent = parent; |
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| 54 | this.prefix = prefix; |
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| 55 | } |
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| 56 | ||
| 57 | /** |
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| 58 | * Create a subset of the specified configuration |
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| 59 | * |
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| 60 | * @param parent The parent configuration |
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| 61 | * @param prefix The prefix used to select the properties |
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| 62 | * @param delimiter The prefix delimiter |
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| 63 | */ |
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| 64 | public SubsetConfiguration(Configuration parent, String prefix, String delimiter) |
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| 65 | { |
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| 66 | this.parent = parent; |
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| 67 | this.prefix = prefix; |
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| 68 | this.delimiter = delimiter; |
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| 69 | } |
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| 70 | ||
| 71 | /** |
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| 72 | * Return the key in the parent configuration associated to the specified |
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| 73 | * key in this subset. |
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| 74 | * |
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| 75 | * @param key The key in the subset. |
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| 76 | */ |
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| 77 | protected String getParentKey(String key) |
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| 78 | { |
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| 79 | if ("".equals(key) || key == null) |
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| 80 | { |
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| 81 | return prefix; |
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| 82 | } |
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| 83 | else |
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| 84 | { |
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| 85 | return delimiter == null ? prefix + key : prefix + delimiter + key; |
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| 86 | } |
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| 87 | } |
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| 88 | ||
| 89 | /** |
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| 90 | * Return the key in the subset configuration associated to the specified |
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| 91 | * key in the parent configuration. |
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| 92 | * |
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| 93 | * @param key The key in the parent configuration. |
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| 94 | */ |
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| 95 | protected String getChildKey(String key) |
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| 96 | { |
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| 97 | if (!key.startsWith(prefix)) |
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| 98 | { |
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| 99 | throw new IllegalArgumentException("The parent key '" + key + "' is not in the subset."); |
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| 100 | } |
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| 101 | else |
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| 102 | { |
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| 103 | String modifiedKey = null; |
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| 104 | if (key.length() == prefix.length()) |
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| 105 | { |
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| 106 | modifiedKey = ""; |
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| 107 | } |
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| 108 | else |
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| 109 | { |
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| 110 | int i = prefix.length() + (delimiter != null ? delimiter.length() : 0); |
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| 111 | modifiedKey = key.substring(i); |
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| 112 | } |
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| 113 | ||
| 114 | return modifiedKey; |
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| 115 | } |
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| 116 | } |
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| 117 | ||
| 118 | /** |
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| 119 | * Return the parent configuation for this subset. |
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| 120 | */ |
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| 121 | public Configuration getParent() |
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| 122 | { |
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| 123 | return parent; |
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| 124 | } |
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| 125 | ||
| 126 | /** |
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| 127 | * Return the prefix used to select the properties in the parent configuration. |
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| 128 | */ |
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| 129 | public String getPrefix() |
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| 130 | { |
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| 131 | return prefix; |
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| 132 | } |
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| 133 | ||
| 134 | /** |
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| 135 | * Set the prefix used to select the properties in the parent configuration. |
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| 136 | */ |
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| 137 | public void setPrefix(String prefix) |
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| 138 | { |
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| 139 | this.prefix = prefix; |
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| 140 | } |
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| 141 | ||
| 142 | /** |
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| 143 | * {@inheritDoc} |
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| 144 | */ |
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| 145 | public Configuration subset(String prefix) |
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| 146 | { |
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| 147 | return parent.subset(getParentKey(prefix)); |
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| 148 | } |
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| 149 | ||
| 150 | /** |
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| 151 | * {@inheritDoc} |
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| 152 | */ |
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| 153 | public boolean isEmpty() |
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| 154 | { |
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| 155 | return !getKeys().hasNext(); |
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| 156 | } |
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| 157 | ||
| 158 | /** |
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| 159 | * {@inheritDoc} |
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| 160 | */ |
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| 161 | public boolean containsKey(String key) |
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| 162 | { |
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| 163 | return parent.containsKey(getParentKey(key)); |
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| 164 | } |
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| 165 | ||
| 166 | /** |
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| 167 | * {@inheritDoc} |
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| 168 | */ |
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| 169 | public void addPropertyDirect(String key, Object value) |
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| 170 | { |
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| 171 | parent.addProperty(getParentKey(key), value); |
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| 172 | } |
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| 173 | ||
| 174 | /** |
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| 175 | * {@inheritDoc} |
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| 176 | */ |
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| 177 | public void setProperty(String key, Object value) |
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| 178 | { |
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| 179 | parent.setProperty(getParentKey(key), value); |
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| 180 | } |
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| 181 | ||
| 182 | /** |
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| 183 | * {@inheritDoc} |
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| 184 | */ |
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| 185 | public void clearProperty(String key) |
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| 186 | { |
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| 187 | parent.clearProperty(getParentKey(key)); |
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| 188 | } |
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| 189 | ||
| 190 | /** |
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| 191 | * {@inheritDoc} |
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| 192 | */ |
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| 193 | public Object getPropertyDirect(String key) |
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| 194 | { |
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| 195 | return parent.getProperty(getParentKey(key)); |
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| 196 | } |
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| 197 | ||
| 198 | /** |
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| 199 | * {@inheritDoc} |
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| 200 | */ |
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| 201 | public Iterator getKeys(String prefix) |
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| 202 | { |
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| 203 | return new TransformIterator(parent.getKeys(getParentKey(prefix)), class="keyword">new Transformer() |
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| 204 | { |
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| 205 | 1 | public Object transform(Object obj) |
| 206 | { |
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| 207 | 2 | return getChildKey((String) obj); |
| 208 | } |
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| 209 | }); |
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| 210 | } |
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| 211 | ||
| 212 | /** |
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| 213 | * {@inheritDoc} |
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| 214 | */ |
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| 215 | public Iterator getKeys() |
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| 216 | { |
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| 217 | return new TransformIterator(parent.getKeys(prefix), class="keyword">new Transformer() |
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| 218 | { |
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| 219 | public Object transform(Object obj) |
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| 220 | { |
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| 221 | return getChildKey((String) obj); |
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| 222 | } |
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| 223 | }); |
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| 224 | } |
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| 225 | ||
| 226 | /** |
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| 227 | * {@inheritDoc} |
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| 228 | */ |
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| 229 | protected String interpolate(String base) |
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| 230 | { |
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| 231 | if (delimiter == null && "".equals(prefix)) |
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| 232 | { |
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| 233 | return super.interpolate(base); |
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| 234 | } |
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| 235 | else |
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| 236 | { |
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| 237 | SubsetConfiguration config = new SubsetConfiguration(parent, ""); |
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| 238 | return config.interpolate(base); |
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| 239 | } |
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| 240 | } |
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| 241 | ||
| 242 | /** |
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| 243 | * {@inheritDoc} |
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| 244 | * |
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| 245 | * Change the behaviour of the parent configuration if it supports this feature. |
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| 246 | */ |
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| 247 | public void setThrowExceptionOnMissing(boolean throwExceptionOnMissing) |
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| 248 | { |
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| 249 | if (parent instanceof AbstractConfiguration) |
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| 250 | { |
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| 251 | ((AbstractConfiguration) parent).setThrowExceptionOnMissing(throwExceptionOnMissing); |
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| 252 | } |
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| 253 | else |
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| 254 | { |
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| 255 | super.setThrowExceptionOnMissing(throwExceptionOnMissing); |
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| 256 | } |
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| 257 | } |
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| 258 | ||
| 259 | /** |
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| 260 | * {@inheritDoc} |
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| 261 | * |
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| 262 | * The subset inherits this feature from its parent if it supports this feature. |
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| 263 | */ |
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| 264 | public boolean isThrowExceptionOnMissing() |
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| 265 | { |
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| 266 | if (parent instanceof AbstractConfiguration) |
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| 267 | { |
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| 268 | return ((AbstractConfiguration) parent).isThrowExceptionOnMissing(); |
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| 269 | } |
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| 270 | else |
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| 271 | { |
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| 272 | return super.isThrowExceptionOnMissing(); |
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| 273 | } |
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| 274 | } |
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| 275 | } |
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