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Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
NamespaceCache.java | 75% | 86,5% | 100% | 84,9% |
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1 | /* | |
2 | * Copyright 2001-2004 (C) MetaStuff, Ltd. All Rights Reserved. | |
3 | * | |
4 | * This software is open source. | |
5 | * See the bottom of this file for the licence. | |
6 | * | |
7 | * $Id: NamespaceCache.java,v 1.11 2004/08/04 18:22:39 maartenc Exp $ | |
8 | */ | |
9 | ||
10 | package org.dom4j.tree; | |
11 | ||
12 | import java.lang.reflect.Constructor; | |
13 | import java.util.Map; | |
14 | ||
15 | import org.dom4j.Namespace; | |
16 | ||
17 | /** | |
18 | * <p><code>NamespaceCache</code> caches instances of <code>DefaultNamespace</code> | |
19 | * for reuse both across documents and within documents.</p> | |
20 | * | |
21 | * @author <a href="mailto:james.strachan@metastuff.com">James Strachan</a> | |
22 | * @author Maarten Coene | |
23 | * @author Brett Finnell | |
24 | * @version $Revision: 1.11 $ | |
25 | */ | |
26 | public class NamespaceCache { | |
27 | ||
28 | /** Cache of {@link Map} instances indexed by URI which contain | |
29 | * caches of {@link Namespace} for each prefix | |
30 | */ | |
31 | protected static Map cache; | |
32 | ||
33 | /** Cache of {@link Namespace} instances indexed by URI | |
34 | * for default namespaces with no prefixes | |
35 | */ | |
36 | protected static Map noPrefixCache; | |
37 | ||
38 | static { | |
39 | /* Try the java.util.concurrent.ConcurrentHashMap first. */ | |
40 | 166 | try { |
41 | 166 | Class clazz = Class.forName("java.util.concurrent.ConcurrentHashMap"); |
42 | 0 | Constructor construct = clazz.getConstructor(new Class[] {Integer.TYPE, Float.TYPE, Integer.TYPE}); |
43 | 0 | cache = (Map) construct.newInstance(new Object[] {new Integer(11), new Float(0.75), new Integer(1)}); |
44 | 0 | noPrefixCache = (Map) construct.newInstance(new Object[] {new Integer(11), new Float(0.75), new Integer(1)}); |
45 | } catch (Exception exc1) { | |
46 | /* Try to use the util.concurrent library (if in classpath) */ | |
47 | 166 | try { |
48 | 166 | Class clazz = Class.forName("EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap"); |
49 | 0 | cache = (Map) clazz.newInstance(); |
50 | 0 | noPrefixCache = (Map) clazz.newInstance(); |
51 | } catch (Exception exc2) { | |
52 | /* If previous implementations fail, use internal one */ | |
53 | 166 | cache = new ConcurrentReaderHashMap(); |
54 | 166 | noPrefixCache = new ConcurrentReaderHashMap(); |
55 | } | |
56 | } | |
57 | ||
58 | } | |
59 | ||
60 | ||
61 | /** @return the name model for the given name and namepsace | |
62 | */ | |
63 | 2238020 | public Namespace get(String prefix, String uri) { |
64 | 2238020 | Map cache = getURICache(uri); |
65 | 2238020 | Namespace answer = (Namespace) cache.get(prefix); |
66 | 2238020 | if (answer == null) { |
67 | 20594 | synchronized (cache) { |
68 | 20594 | answer = (Namespace) cache.get(prefix); |
69 | 20594 | if (answer == null) { |
70 | 20594 | answer = createNamespace(prefix, uri); |
71 | 20594 | cache.put(prefix, answer); |
72 | } | |
73 | } | |
74 | } | |
75 | 2238020 | return answer; |
76 | } | |
77 | ||
78 | ||
79 | /** @return the name model for the given name and namepsace | |
80 | */ | |
81 | 20 | public Namespace get(String uri) { |
82 | 20 | Namespace answer = (Namespace) noPrefixCache.get(uri); |
83 | 20 | if (answer == null) { |
84 | 10 | synchronized (noPrefixCache) { |
85 | 10 | answer = (Namespace) noPrefixCache.get(uri); |
86 | 10 | if (answer == null) { |
87 | 10 | answer = createNamespace("", uri); |
88 | 10 | noPrefixCache.put(uri, answer); |
89 | } | |
90 | } | |
91 | } | |
92 | 20 | return answer; |
93 | } | |
94 | ||
95 | ||
96 | /** @return the cache for the given namespace URI. If one does not | |
97 | * currently exist it is created. | |
98 | */ | |
99 | 2238020 | protected Map getURICache(String uri) { |
100 | 2238020 | Map answer = (Map) cache.get(uri); |
101 | 2238020 | if (answer == null) { |
102 | 20546 | synchronized (cache) { |
103 | 20546 | answer = (Map) cache.get(uri); |
104 | 20546 | if (answer == null) { |
105 | 20546 | answer = new ConcurrentReaderHashMap(); |
106 | 20546 | cache.put(uri, answer); |
107 | } | |
108 | } | |
109 | } | |
110 | 2238020 | return answer; |
111 | } | |
112 | ||
113 | /** A factory method to create {@link Namespace} instance | |
114 | * @return a newly created {@link Namespace} instance. | |
115 | */ | |
116 | 20604 | protected Namespace createNamespace(String prefix, String uri) { |
117 | 20604 | return new Namespace(prefix, uri); |
118 | } | |
119 | } | |
120 | ||
121 | ||
122 | ||
123 | ||
124 | /* | |
125 | * Redistribution and use of this software and associated documentation | |
126 | * ("Software"), with or without modification, are permitted provided | |
127 | * that the following conditions are met: | |
128 | * | |
129 | * 1. Redistributions of source code must retain copyright | |
130 | * statements and notices. Redistributions must also contain a | |
131 | * copy of this document. | |
132 | * | |
133 | * 2. Redistributions in binary form must reproduce the | |
134 | * above copyright notice, this list of conditions and the | |
135 | * following disclaimer in the documentation and/or other | |
136 | * materials provided with the distribution. | |
137 | * | |
138 | * 3. The name "DOM4J" must not be used to endorse or promote | |
139 | * products derived from this Software without prior written | |
140 | * permission of MetaStuff, Ltd. For written permission, | |
141 | * please contact dom4j-info@metastuff.com. | |
142 | * | |
143 | * 4. Products derived from this Software may not be called "DOM4J" | |
144 | * nor may "DOM4J" appear in their names without prior written | |
145 | * permission of MetaStuff, Ltd. DOM4J is a registered | |
146 | * trademark of MetaStuff, Ltd. | |
147 | * | |
148 | * 5. Due credit should be given to the DOM4J Project - | |
149 | * http://dom4j.org/ | |
150 | * | |
151 | * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS | |
152 | * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT | |
153 | * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
154 | * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL | |
155 | * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
156 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
157 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
158 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
159 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
160 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
161 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
162 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
163 | * | |
164 | * Copyright 2001-2004 (C) MetaStuff, Ltd. All Rights Reserved. | |
165 | * | |
166 | * $Id: NamespaceCache.java,v 1.11 2004/08/04 18:22:39 maartenc Exp $ | |
167 | */ |
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