1   /**
2    * Copyright (c) 2000-2009 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 com.liferay.portal.kernel.log.Log;
26  import com.liferay.portal.kernel.log.LogFactoryUtil;
27  
28  import java.lang.reflect.Array;
29  import java.lang.reflect.InvocationTargetException;
30  import java.lang.reflect.Method;
31  
32  import java.util.ArrayList;
33  import java.util.List;
34  
35  /**
36   * <a href="MethodInvoker.java.html"><b><i>View Source</i></b></a>
37   *
38   * @author Brian Wing Shun Chan
39   * @author Harry Mark
40   *
41   */
42  public class MethodInvoker {
43  
44      public static Object invoke(MethodWrapper methodWrapper)
45          throws ClassNotFoundException, IllegalAccessException,
46                 InstantiationException, InvocationTargetException,
47                 NoSuchFieldException, NoSuchMethodException {
48  
49          return invoke(methodWrapper, true);
50      }
51  
52      public static Object invoke(
53              MethodWrapper methodWrapper, boolean newInstance)
54          throws ClassNotFoundException, IllegalAccessException,
55                 InstantiationException, InvocationTargetException,
56                 NoSuchFieldException, NoSuchMethodException {
57  
58          Thread currentThread = Thread.currentThread();
59  
60          ClassLoader contextClassLoader = currentThread.getContextClassLoader();
61  
62          String className = methodWrapper.getClassName();
63          String methodName = methodWrapper.getMethodName();
64          Object[] args = methodWrapper.getArgs();
65  
66          List<Class<?>> parameterTypes = new ArrayList<Class<?>>();
67  
68          for (int i = 0; i < args.length; i++) {
69              if (args[i] == null) {
70                  _log.error(
71                      "Cannot invoke " + className + " " + methodName +
72                          " on position " + i + " because it is null");
73              }
74  
75              Class<?> argClass = args[i].getClass();
76  
77              if (ClassUtil.isSubclass(argClass, PrimitiveWrapper.class)) {
78                  parameterTypes.add(
79                      (Class<?>)argClass.getField("TYPE").get(args[i]));
80  
81                  MethodKey methodKey = new MethodKey(
82                      argClass.getName(), "getValue", null);
83  
84                  Method method = MethodCache.get(methodKey);
85  
86                  args[i] = method.invoke(args[i], (Object[])null);
87              }
88              else if (args[i] instanceof NullWrapper) {
89                  NullWrapper nullWrapper = (NullWrapper)args[i];
90  
91                  String wrappedClassName = nullWrapper.getClassName();
92  
93                  if (wrappedClassName.startsWith(StringPool.OPEN_BRACKET) &&
94                      wrappedClassName.endsWith(StringPool.SEMICOLON)) {
95  
96                      wrappedClassName = wrappedClassName.substring(
97                          2, wrappedClassName.length() - 1);
98  
99                      Class<?> wrappedClass = contextClassLoader.loadClass(
100                         wrappedClassName);
101 
102                     parameterTypes.add(
103                         Array.newInstance(wrappedClass, 0).getClass());
104                 }
105                 else {
106                     Class<?> wrappedClass = contextClassLoader.loadClass(
107                         wrappedClassName);
108 
109                     parameterTypes.add(wrappedClass);
110                 }
111 
112                 args[i] = null;
113             }
114             else {
115                 parameterTypes.add(argClass);
116             }
117         }
118 
119         Object classObj = contextClassLoader.loadClass(className);
120 
121         if (newInstance) {
122             classObj = ((Class<?>)classObj).newInstance();
123         }
124 
125         Method method = null;
126 
127         try {
128             MethodKey methodKey = new MethodKey(
129                 methodWrapper.getClassName(), methodWrapper.getMethodName(),
130                 parameterTypes.toArray(new Class[parameterTypes.size()]));
131 
132             method = MethodCache.get(methodKey);
133         }
134         catch (NoSuchMethodException nsme) {
135             Method[] methods = null;
136 
137             if (newInstance) {
138                 methods = classObj.getClass().getMethods();
139             }
140             else {
141                 methods = ((Class<?>)classObj).getMethods();
142             }
143 
144             for (int i = 0; i < methods.length; i++) {
145                 Class<?>[] methodParameterTypes =
146                     methods[i].getParameterTypes();
147 
148                 if (methods[i].getName().equals(methodName) &&
149                     methodParameterTypes.length == parameterTypes.size()) {
150 
151                     boolean correctParams = true;
152 
153                     for (int j = 0; j < parameterTypes.size(); j++) {
154                         Class<?> a = parameterTypes.get(j);
155                         Class<?> b = methodParameterTypes[j];
156 
157                         if (!ClassUtil.isSubclass(a, b)) {
158                             correctParams = false;
159 
160                             break;
161                         }
162                     }
163 
164                     if (correctParams) {
165                         method = methods[i];
166 
167                         break;
168                     }
169                 }
170             }
171 
172             if (method == null) {
173                 throw nsme;
174             }
175         }
176 
177         Object returnObj = null;
178 
179         if (method != null) {
180             returnObj = method.invoke(classObj, args);
181         }
182 
183         return returnObj;
184     }
185 
186     private static Log _log = LogFactoryUtil.getLog(MethodInvoker.class);
187 
188 }