Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
SubsetConfiguration |
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| 1.4761904761904763;1,476 | ||||
SubsetConfiguration$1 |
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| 1.4761904761904763;1,476 | ||||
SubsetConfiguration$2 |
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| 1.4761904761904763;1,476 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | ||
18 | package org.apache.commons.configuration; | |
19 | ||
20 | import java.util.Iterator; | |
21 | ||
22 | import org.apache.commons.collections.Transformer; | |
23 | import org.apache.commons.collections.iterators.TransformIterator; | |
24 | ||
25 | /** | |
26 | * <p>A subset of another configuration. The new Configuration object contains | |
27 | * every key from the parent Configuration that starts with prefix. The prefix | |
28 | * is removed from the keys in the subset.</p> | |
29 | * <p>It is usually not necessary to use this class directly. Instead the | |
30 | * <code>{@link Configuration#subset(String)}</code> method should be used, | |
31 | * which will return a correctly initialized instance.</p> | |
32 | * | |
33 | * @author Emmanuel Bourg | |
34 | * @version $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02 Sep 2006) $ | |
35 | */ | |
36 | public class SubsetConfiguration extends AbstractConfiguration | |
37 | { | |
38 | /** The parent configuration. */ | |
39 | protected Configuration parent; | |
40 | ||
41 | /** The prefix used to select the properties. */ | |
42 | protected String prefix; | |
43 | ||
44 | /** The prefix delimiter */ | |
45 | protected String delimiter; | |
46 | ||
47 | /** | |
48 | * Create a subset of the specified configuration | |
49 | * | |
50 | * @param parent The parent configuration | |
51 | * @param prefix The prefix used to select the properties | |
52 | */ | |
53 | public SubsetConfiguration(Configuration parent, String prefix) | |
54 | 15 | { |
55 | 15 | this.parent = parent; |
56 | 15 | this.prefix = prefix; |
57 | 15 | } |
58 | ||
59 | /** | |
60 | * Create a subset of the specified configuration | |
61 | * | |
62 | * @param parent The parent configuration | |
63 | * @param prefix The prefix used to select the properties | |
64 | * @param delimiter The prefix delimiter | |
65 | */ | |
66 | public SubsetConfiguration(Configuration parent, String prefix, String delimiter) | |
67 | 52 | { |
68 | 52 | this.parent = parent; |
69 | 52 | this.prefix = prefix; |
70 | 52 | this.delimiter = delimiter; |
71 | 52 | } |
72 | ||
73 | /** | |
74 | * Return the key in the parent configuration associated to the specified | |
75 | * key in this subset. | |
76 | * | |
77 | * @param key The key in the subset. | |
78 | * @return the key as to be used by the parent | |
79 | */ | |
80 | protected String getParentKey(String key) | |
81 | { | |
82 | 49 | if ("".equals(key) || key == null) |
83 | { | |
84 | 4 | return prefix; |
85 | } | |
86 | else | |
87 | { | |
88 | 45 | return delimiter == null ? prefix + key : prefix + delimiter + key; |
89 | } | |
90 | } | |
91 | ||
92 | /** | |
93 | * Return the key in the subset configuration associated to the specified | |
94 | * key in the parent configuration. | |
95 | * | |
96 | * @param key The key in the parent configuration. | |
97 | * @return the key in the context of this subset configuration | |
98 | */ | |
99 | protected String getChildKey(String key) | |
100 | { | |
101 | 102 | if (!key.startsWith(prefix)) |
102 | { | |
103 | 0 | throw new IllegalArgumentException("The parent key '" + key + "' is not in the subset."); |
104 | } | |
105 | else | |
106 | { | |
107 | 102 | String modifiedKey = null; |
108 | 102 | if (key.length() == prefix.length()) |
109 | { | |
110 | 4 | modifiedKey = ""; |
111 | } | |
112 | else | |
113 | { | |
114 | 98 | int i = prefix.length() + (delimiter != null ? delimiter.length() : 0); |
115 | 98 | modifiedKey = key.substring(i); |
116 | } | |
117 | ||
118 | 102 | return modifiedKey; |
119 | } | |
120 | } | |
121 | ||
122 | /** | |
123 | * Return the parent configuation for this subset. | |
124 | * | |
125 | * @return the parent configuration | |
126 | */ | |
127 | public Configuration getParent() | |
128 | { | |
129 | 1 | return parent; |
130 | } | |
131 | ||
132 | /** | |
133 | * Return the prefix used to select the properties in the parent configuration. | |
134 | * | |
135 | * @return the prefix used by this subset | |
136 | */ | |
137 | public String getPrefix() | |
138 | { | |
139 | 2 | return prefix; |
140 | } | |
141 | ||
142 | /** | |
143 | * Set the prefix used to select the properties in the parent configuration. | |
144 | * | |
145 | * @param prefix the prefix | |
146 | */ | |
147 | public void setPrefix(String prefix) | |
148 | { | |
149 | 1 | this.prefix = prefix; |
150 | 1 | } |
151 | ||
152 | /** | |
153 | * {@inheritDoc} | |
154 | */ | |
155 | public Configuration subset(String prefix) | |
156 | { | |
157 | 1 | return parent.subset(getParentKey(prefix)); |
158 | } | |
159 | ||
160 | /** | |
161 | * {@inheritDoc} | |
162 | */ | |
163 | public boolean isEmpty() | |
164 | { | |
165 | 8 | return !getKeys().hasNext(); |
166 | } | |
167 | ||
168 | /** | |
169 | * {@inheritDoc} | |
170 | */ | |
171 | public boolean containsKey(String key) | |
172 | { | |
173 | 10 | return parent.containsKey(getParentKey(key)); |
174 | } | |
175 | ||
176 | /** | |
177 | * {@inheritDoc} | |
178 | */ | |
179 | public void addPropertyDirect(String key, Object value) | |
180 | { | |
181 | 0 | parent.addProperty(getParentKey(key), value); |
182 | 0 | } |
183 | ||
184 | /** | |
185 | * {@inheritDoc} | |
186 | */ | |
187 | public void setProperty(String key, Object value) | |
188 | { | |
189 | 4 | parent.setProperty(getParentKey(key), value); |
190 | 4 | } |
191 | ||
192 | /** | |
193 | * {@inheritDoc} | |
194 | */ | |
195 | public void clearProperty(String key) | |
196 | { | |
197 | 1 | parent.clearProperty(getParentKey(key)); |
198 | 1 | } |
199 | ||
200 | /** | |
201 | * {@inheritDoc} | |
202 | */ | |
203 | public Object getProperty(String key) | |
204 | { | |
205 | 28 | return parent.getProperty(getParentKey(key)); |
206 | } | |
207 | ||
208 | /** | |
209 | * {@inheritDoc} | |
210 | */ | |
211 | public Iterator getKeys(String prefix) | |
212 | { | |
213 | 1 | return new TransformIterator(parent.getKeys(getParentKey(prefix)), new Transformer() |
214 | { | |
215 | 1 | public Object transform(Object obj) |
216 | { | |
217 | 2 | return getChildKey((String) obj); |
218 | } | |
219 | }); | |
220 | } | |
221 | ||
222 | /** | |
223 | * {@inheritDoc} | |
224 | */ | |
225 | public Iterator getKeys() | |
226 | { | |
227 | 24 | return new TransformIterator(parent.getKeys(prefix), new Transformer() |
228 | { | |
229 | 24 | public Object transform(Object obj) |
230 | { | |
231 | 96 | return getChildKey((String) obj); |
232 | } | |
233 | }); | |
234 | } | |
235 | ||
236 | /** | |
237 | * {@inheritDoc} | |
238 | */ | |
239 | protected String interpolate(String base) | |
240 | { | |
241 | 28 | if (delimiter == null && "".equals(prefix)) |
242 | { | |
243 | 14 | return super.interpolate(base); |
244 | } | |
245 | else | |
246 | { | |
247 | 14 | SubsetConfiguration config = new SubsetConfiguration(parent, ""); |
248 | 14 | return config.interpolate(base); |
249 | } | |
250 | } | |
251 | ||
252 | /** | |
253 | * {@inheritDoc} | |
254 | * | |
255 | * Change the behaviour of the parent configuration if it supports this feature. | |
256 | */ | |
257 | public void setThrowExceptionOnMissing(boolean throwExceptionOnMissing) | |
258 | { | |
259 | 1 | if (parent instanceof AbstractConfiguration) |
260 | { | |
261 | 1 | ((AbstractConfiguration) parent).setThrowExceptionOnMissing(throwExceptionOnMissing); |
262 | } | |
263 | else | |
264 | { | |
265 | 0 | super.setThrowExceptionOnMissing(throwExceptionOnMissing); |
266 | } | |
267 | 1 | } |
268 | ||
269 | /** | |
270 | * {@inheritDoc} | |
271 | * | |
272 | * The subset inherits this feature from its parent if it supports this feature. | |
273 | */ | |
274 | public boolean isThrowExceptionOnMissing() | |
275 | { | |
276 | 2 | if (parent instanceof AbstractConfiguration) |
277 | { | |
278 | 2 | return ((AbstractConfiguration) parent).isThrowExceptionOnMissing(); |
279 | } | |
280 | else | |
281 | { | |
282 | 0 | return super.isThrowExceptionOnMissing(); |
283 | } | |
284 | } | |
285 | } |