1 /***
2 * Redistribution and use of this software and associated documentation
3 * ("Software"), with or without modification, are permitted provided
4 * that the following conditions are met:
5 *
6 * 1. Redistributions of source code must retain copyright
7 * statements and notices. Redistributions must also contain a
8 * copy of this document.
9 *
10 * 2. Redistributions in binary form must reproduce the
11 * above copyright notice, this list of conditions and the
12 * following disclaimer in the documentation and/or other
13 * materials provided with the distribution.
14 *
15 * 3. The name "Exolab" must not be used to endorse or promote
16 * products derived from this Software without prior written
17 * permission of Exoffice Technologies. For written permission,
18 * please contact tma@netspace.net.au.
19 *
20 * 4. Products derived from this Software may not be called "Exolab"
21 * nor may "Exolab" appear in their names without prior written
22 * permission of Exoffice Technologies. Exolab is a registered
23 * trademark of Exoffice Technologies.
24 *
25 * 5. Due credit should be given to the Exolab Project
26 * (http://www.exolab.org/).
27 *
28 * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32 * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39 * OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Copyright 2001-2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42 *
43 * $Id: MethodCache.java,v 1.2 2004/01/31 13:44:24 tanderson Exp $
44 */
45 package org.exolab.jmscts.core;
46
47 import java.lang.reflect.Method;
48
49 import java.util.ArrayList;
50 import java.util.HashMap;
51 import java.util.Iterator;
52
53
54 /***
55 * Helper for caching the methods of a class to avoid expensive
56 * {@link Class#getDeclaredMethods} and {@link Class#getMethod} calls
57 *
58 * @version $Revision: 1.2 $ $Date: 2004/01/31 13:44:24 $
59 * @author <a href="mailto:tma@netspace.net.au">Tim Anderson</a>
60 */
61 public class MethodCache {
62
63 /***
64 * The class for which the methods are being cached
65 */
66 private final Class _type;
67
68 /***
69 * A cache of methods, keyed by name. Where multiple instances exist
70 * with the same name, a list is used
71 */
72 private final HashMap _cache = new HashMap();
73
74
75 /***
76 * Cache all public methods for the specified class type
77 *
78 * @param type the class type to cache methods for
79 */
80 public MethodCache(Class type) {
81 _type = type;
82 Method[] methods = _type.getMethods();
83 for (int i = 0; i < methods.length; ++i) {
84 Method method = methods[i];
85 String name = method.getName();
86 Object value = _cache.get(name);
87 if (value == null) {
88 _cache.put(name, method);
89 } else {
90 if (value instanceof ArrayList) {
91 ((ArrayList) value).add(method);
92 } else {
93 ArrayList list = new ArrayList();
94 list.add(value); // add the existing method
95 list.add(method);
96 _cache.put(name, list);
97 }
98 }
99 }
100 }
101
102 /***
103 * Get the named method. If more than one method exists with the same
104 * name, the first will be returned
105 *
106 * @param name the name of the method
107 * @return the first method matching name
108 * @throws NoSuchMethodException if the method doesn't exist
109 */
110 public Method getMethod(String name) throws NoSuchMethodException {
111 Object value = _cache.get(name);
112 if (value == null) {
113 throw new NoSuchMethodException(
114 "Method=" + name + " not found for class=" + _type.getName());
115 }
116 Method result = null;
117 if (value instanceof Method) {
118 result = (Method) value;
119 } else {
120 result = (Method) ((ArrayList) value).get(0);
121 }
122 return result;
123 }
124
125 /***
126 * Get the named method, with the specified number of arguments.
127 * If more than one method exists the first will be returned
128 *
129 * @param name the name of the method
130 * @param args the number of arguments
131 * @return the first method matching name
132 * @throws NoSuchMethodException if the method doesn't exist
133 */
134 public Method getMethod(String name, int args)
135 throws NoSuchMethodException {
136
137 Object value = _cache.get(name);
138 if (value == null) {
139 throw new NoSuchMethodException(
140 "Method=" + name + " not found for class=" + _type.getName());
141 }
142 Method result = null;
143 if (value instanceof Method) {
144 result = (Method) value;
145 if (result.getParameterTypes().length != args) {
146 throw new NoSuchMethodException(
147 "Method=" + name + " taking parameters=" + args
148 + " not found for class=" + _type.getName());
149 }
150 } else {
151 ArrayList list = (ArrayList) value;
152 Iterator iter = list.iterator();
153 Method next = null;
154 while (iter.hasNext()) {
155 next = (Method) iter.next();
156 if (next.getParameterTypes().length == args) {
157 result = next;
158 break;
159 }
160 }
161 if (result == null) {
162 throw new NoSuchMethodException(
163 "Method=" + name + " taking parameters=" + args
164 + " not found for class=" + _type.getName());
165 }
166 }
167 return result;
168 }
169
170 }
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