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  }