| Clover coverage report - dom4j - 1.5 |
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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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