dom4j - 1.6.1

Clover coverage report - dom4j - 1.6.1
Coverage timestamp: ma mei 16 2005 14:23:01 GMT+01:00
FRAMES NO FRAMES

file stats: | LOC: | 216 |  | Methods: | 4
| NCLOC: | 89 |  | Classes: | 1

Source file | Conditionals | Statements | Methods | TOTAL

NamespaceCache.java

80%

87,2%

100%

85,9%

1 |  | /*
2 |  | * Copyright 2001-2005 (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 |  |
8 |  | package org.dom4j.tree;
9 |  |
10 |  | import java.lang.ref.WeakReference;
11 |  | import java.lang.reflect.Constructor;
12 |  | import java.util.Map;
13 |  |
14 |  | import org.dom4j.Namespace;
15 |  |
16 |  | /**
17 |  | * <p>
18 |  | * <code>NamespaceCache</code> caches instances of
19 |  | * <code>DefaultNamespace</code> for reuse both across documents and within
20 |  | * documents.
21 |  | * </p>
22 |  | *
23 |  | * @author <a href="mailto:james.strachan@metastuff.com">James Strachan </a>
24 |  | * @author Maarten Coene
25 |  | * @author Brett Finnell
26 |  | * @version $Revision: 1.15 $
27 |  | */
28 |  | public class NamespaceCache {
29 |  | private static final String CONCURRENTREADERHASHMAP_CLASS
30 |  | = "EDU.oswego.cs.dl.util.concurrent.ConcurrentReaderHashMap";
31 |  |
32 |  | /**
33 |  | * Cache of {@link Map}instances indexed by URI which contain caches of
34 |  | * {@link Namespace}for each prefix
35 |  | */
36 |  | protected static Map cache;
37 |  |
38 |  | /**
39 |  | * Cache of {@link Namespace}instances indexed by URI for default
40 |  | * namespaces with no prefixes
41 |  | */
42 |  | protected static Map noPrefixCache;
43 |  |
44 |  | static {
45 |  | /* Try the java.util.concurrent.ConcurrentHashMap first. */
46 | 90 | try {
47 | 90 | Class clazz = Class
48 |  | .forName("java.util.concurrent.ConcurrentHashMap");
49 | 0 | Constructor construct = clazz.getConstructor(new Class[] {
50 |  | Integer.TYPE, Float.TYPE, Integer.TYPE });
51 | 0 | cache = (Map) construct.newInstance(new Object[] {new Integer(11),
52 |  | new Float(0.75f), new Integer(1) });
53 | 0 | noPrefixCache = (Map) construct.newInstance(new Object[] {
54 |  | new Integer(11), new Float(0.75f), new Integer(1) });
55 |  | } catch (Throwable t1) {
56 |  | /* Try to use the util.concurrent library (if in classpath) */
57 | 90 | try {
58 | 90 | Class clazz = Class.forName(CONCURRENTREADERHASHMAP_CLASS);
59 | 0 | cache = (Map) clazz.newInstance();
60 | 0 | noPrefixCache = (Map) clazz.newInstance();
61 |  | } catch (Throwable t2) {
62 |  | /* If previous implementations fail, use internal one */
63 | 90 | cache = new ConcurrentReaderHashMap();
64 | 90 | noPrefixCache = new ConcurrentReaderHashMap();
65 |  | }
66 |  | }
67 |  | }
68 |  |
69 |  | /**
70 |  | * DOCUMENT ME!
71 |  | *
72 |  | * @param prefix
73 |  | * DOCUMENT ME!
74 |  | * @param uri
75 |  | * DOCUMENT ME!
76 |  | *
77 |  | * @return the namespace for the given prefix and uri
78 |  | */
79 | 1121352 | public Namespace get(String prefix, String uri) {
80 | 1121352 | Map uriCache = getURICache(uri);
81 | 1121352 | WeakReference ref = (WeakReference) uriCache.get(prefix);
82 | 1121352 | Namespace answer = null;
83 |  |
84 | 1121352 | if (ref != null) {
85 | 1111030 | answer = (Namespace) ref.get();
86 |  | }
87 |  |
88 | 1121352 | if (answer == null) {
89 | 10328 | synchronized (uriCache) {
90 | 10328 | ref = (WeakReference) uriCache.get(prefix);
91 |  |
92 | 10328 | if (ref != null) {
93 | 6 | answer = (Namespace) ref.get();
94 |  | }
95 |  |
96 | 10328 | if (answer == null) {
97 | 10328 | answer = createNamespace(prefix, uri);
98 | 10328 | uriCache.put(prefix, new WeakReference(answer));
99 |  | }
100 |  | }
101 |  | }
102 |  |
103 | 1121352 | return answer;
104 |  | }
105 |  |
106 |  | /**
107 |  | * DOCUMENT ME!
108 |  | *
109 |  | * @param uri
110 |  | * DOCUMENT ME!
111 |  | *
112 |  | * @return the name model for the given name and namepsace
113 |  | */
114 | 26 | public Namespace get(String uri) {
115 | 26 | WeakReference ref = (WeakReference) noPrefixCache.get(uri);
116 | 26 | Namespace answer = null;
117 |  |
118 | 26 | if (ref != null) {
119 | 20 | answer = (Namespace) ref.get();
120 |  | }
121 |  |
122 | 26 | if (answer == null) {
123 | 6 | synchronized (noPrefixCache) {
124 | 6 | ref = (WeakReference) noPrefixCache.get(uri);
125 |  |
126 | 6 | if (ref != null) {
127 | 0 | answer = (Namespace) ref.get();
128 |  | }
129 |  |
130 | 6 | if (answer == null) {
131 | 6 | answer = createNamespace("", uri);
132 | 6 | noPrefixCache.put(uri, new WeakReference(answer));
133 |  | }
134 |  | }
135 |  | }
136 |  |
137 | 26 | return answer;
138 |  | }
139 |  |
140 |  | /**
141 |  | * DOCUMENT ME!
142 |  | *
143 |  | * @param uri
144 |  | * DOCUMENT ME!
145 |  | *
146 |  | * @return the cache for the given namespace URI. If one does not currently
147 |  | * exist it is created.
148 |  | */
149 | 1121352 | protected Map getURICache(String uri) {
150 | 1121352 | Map answer = (Map) cache.get(uri);
151 |  |
152 | 1121352 | if (answer == null) {
153 | 10296 | synchronized (cache) {
154 | 10296 | answer = (Map) cache.get(uri);
155 |  |
156 | 10296 | if (answer == null) {
157 | 10296 | answer = new ConcurrentReaderHashMap();
158 | 10296 | cache.put(uri, answer);
159 |  | }
160 |  | }
161 |  | }
162 |  |
163 | 1121352 | return answer;
164 |  | }
165 |  |
166 |  | /**
167 |  | * A factory method to create {@link Namespace}instance
168 |  | *
169 |  | * @param prefix
170 |  | * DOCUMENT ME!
171 |  | * @param uri
172 |  | * DOCUMENT ME!
173 |  | *
174 |  | * @return a newly created {@link Namespace}instance.
175 |  | */
176 | 10334 | protected Namespace createNamespace(String prefix, String uri) {
177 | 10334 | return new Namespace(prefix, uri);
178 |  | }
179 |  | }
180 |  |
181 |  | /*
182 |  | * Redistribution and use of this software and associated documentation
183 |  | * ("Software"), with or without modification, are permitted provided that the
184 |  | * following conditions are met:
185 |  | *
186 |  | * 1. Redistributions of source code must retain copyright statements and
187 |  | * notices. Redistributions must also contain a copy of this document.
188 |  | *
189 |  | * 2. Redistributions in binary form must reproduce the above copyright notice,
190 |  | * this list of conditions and the following disclaimer in the documentation
191 |  | * and/or other materials provided with the distribution.
192 |  | *
193 |  | * 3. The name "DOM4J" must not be used to endorse or promote products derived
194 |  | * from this Software without prior written permission of MetaStuff, Ltd. For
195 |  | * written permission, please contact dom4j-info@metastuff.com.
196 |  | *
197 |  | * 4. Products derived from this Software may not be called "DOM4J" nor may
198 |  | * "DOM4J" appear in their names without prior written permission of MetaStuff,
199 |  | * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
200 |  | *
201 |  | * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
202 |  | *
203 |  | * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
204 |  | * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
205 |  | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
206 |  | * ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
207 |  | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
208 |  | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
209 |  | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
210 |  | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
211 |  | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
212 |  | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
213 |  | * POSSIBILITY OF SUCH DAMAGE.
214 |  | *
215 |  | * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
216 |  | */