| MethodCache.java |
1 /**
2 * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20 * SOFTWARE.
21 */
22
23 package com.liferay.portal.kernel.util;
24
25 import java.lang.reflect.Method;
26
27 import java.util.HashMap;
28 import java.util.Map;
29
30 /**
31 * <a href="MethodCache.java.html"><b><i>View Source</i></b></a>
32 *
33 * @author Michael C. Han
34 *
35 */
36 public class MethodCache {
37
38 public static Method get(String className, String methodName)
39 throws ClassNotFoundException, NoSuchMethodException {
40
41 return get(className, methodName, new Class[0]);
42 }
43
44 public static Method get(
45 String className, String methodName, Class<?>[] parameterTypes)
46 throws ClassNotFoundException, NoSuchMethodException {
47
48 MethodKey methodKey = new MethodKey(
49 className, methodName, parameterTypes);
50
51 return get(methodKey);
52 }
53
54 public static Method get(MethodKey methodKey)
55 throws ClassNotFoundException, NoSuchMethodException {
56
57 return _instance._get(methodKey);
58 }
59
60 private MethodCache() {
61 _classes = new HashMap<String, Class<?>>();
62 _methods = new HashMap<MethodKey, Method>();
63 }
64
65 private Method _get(MethodKey methodKey)
66 throws ClassNotFoundException, NoSuchMethodException {
67
68 Method method = _methods.get(methodKey);
69
70 if (method == null) {
71 String className = methodKey.getClassName();
72 String methodName = methodKey.getMethodName();
73 Class<?>[] types = methodKey.getTypes();
74
75 Class<?> classObj = _classes.get(className);
76
77 if (classObj == null) {
78 ClassLoader contextClassLoader =
79 Thread.currentThread().getContextClassLoader();
80
81 classObj = contextClassLoader.loadClass(className);
82
83 _classes.put(className, classObj);
84 }
85
86 method = classObj.getMethod(methodName, types);
87
88 _methods.put(methodKey, method);
89 }
90
91 return method;
92 }
93
94 private static MethodCache _instance = new MethodCache();
95
96 private Map<String, Class<?>> _classes;
97 private Map<MethodKey, Method> _methods;
98
99 }