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org.apache.commons.configuration.ConfigurationMap$ConfigurationSet	100%	100%

1		/*
2		* Copyright 2004-2005 The Apache Software Foundation.
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License")
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*/
16
17		package org.apache.commons.configuration;
18
19		import java.util.AbstractMap;
20		import java.util.AbstractSet;
21		import java.util.Iterator;
22		import java.util.Map;
23		import java.util.Set;
24
25		/**
26		* <p>The <code>ConfigurationMap</code> wraps a
27		* configuration-collection
28		* {@link org.apache.commons.configuration.Configuration}
29		* instance to provide a <code>Map</code> interface.</p>
30		*
31		* <p><em>Note:</em> This implementation is incomplete.</p>
32		*
33		* @author <a href="mailto:ricardo.gladwell@btinternet.com">Ricardo Gladwell</a>
34		* @version $Revision$, $Date: 2005-12-06 04:10:27 +0100 (Tue, 06 Dec 2005) $
35		* @since 1.0
36		*/
37		public class ConfigurationMap extends AbstractMap
38		{
39		/**
40		* The <code>Configuration</code> wrapped by this class.
41		*/
42		private Configuration configuration;
43
44		/**
45		* Creates a new instance of a <code>ConfigurationMap</code>
46		* that wraps the specified <code>Configuration</code>
47		* instance.
48		* @param configuration <code>Configuration</code>
49		* instance.
50		*/
51		public ConfigurationMap(Configuration configuration)
52		{
53		this.configuration = configuration;
54		}
55
56		/**
57		* Returns the wrapped <code>Configuration</code> object.
58		*
59		* @return the wrapped configuration
60		* @since 1.2
61		*/
62		public Configuration getConfiguration()
63		{
64		return configuration;
65		}
66
67		/**
68		* @see java.util.Map#entrySet()
69		*/
70		public Set entrySet()
71		{
72		return new ConfigurationSet(configuration);
73		}
74
75		/**
76		* @see java.util.Map#put(java.lang.Object, java.lang.Object)
77		*/
78		public Object put(Object key, Object value)
79		{
80		String strKey = String.valueOf(key);
81		Object old = configuration.getProperty(strKey);
82		configuration.setProperty(strKey, value);
83		return old;
84		}
85
86		/**
87		* @see java.util.Map#get(java.lang.Object)
88		*/
89		public Object get(Object key)
90		{
91		return configuration.getProperty(String.valueOf(key));
92		}
93
94	8	/**
95		* Set of entries in the map.
96		*/
97	16	static class ConfigurationSet extends AbstractSet
98		{
99		/** The configuration mapped to this entry set. */
100		private Configuration configuration;
101
102		/**
103		* A Map entry in the ConfigurationMap.
104		*/
105		private final class Entry implements Map.Entry
106		{
107		/** The key of the map entry. */
108		private Object key;
109
110		private Entry(Object key)
111		{
112		this.key = key;
113		}
114
115		public Object getKey()
116		{
117		return key;
118		}
119
120		public Object getValue()
121		{
122		return configuration.getProperty((String) key);
123		}
124
125		public Object setValue(Object value)
126		{
127		Object old = getValue();
128		configuration.setProperty((String) key, value);
129		return old;
130		}
131		}
132
133		/**
134		* Iterator over the entries in the ConfigurationMap.
135		*/
136		private final class ConfigurationSetIterator implements Iterator
137		{
138		/** An iterator over the keys in the configuration. */
139		private Iterator keys;
140
141		private ConfigurationSetIterator()
142		{
143		keys = configuration.getKeys();
144		}
145
146		public boolean hasNext()
147		{
148		return keys.hasNext();
149		}
150
151		public Object next()
152		{
153	2	return new Entry(keys.next());
154	2	}
155	2
156		public void remove()
157		{
158		keys.remove();
159		}
160		}
161
162		ConfigurationSet(Configuration configuration)
163	6	{
164	15	this.configuration = configuration;
165	4	}
166	7
167	7	/**
168		* @see java.util.Collection#size()
169	2	*/
170		public int size()
171		{
172		// Ouch. Now _that_ one is expensive...
173	4	int count = 0;
174	22	for (Iterator iterator = configuration.getKeys(); iterator.hasNext();)
175		{
176	14	iterator.next();
177	15	count++;
178		}
179	4	return count;
180		}
181
182		/**
183		* @see java.util.Collection#iterator()
184		*/
185		public Iterator iterator()
186		{
187	2	return new ConfigurationSetIterator();
188		}
189		}
190		}

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