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 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          ClassLoader contextClassLoader =
59              Thread.currentThread().getContextClassLoader();
60  
61          String className = methodWrapper.getClassName();
62          String methodName = methodWrapper.getMethodName();
63          Object[] args = methodWrapper.getArgs();
64  
65          List<Object> parameterTypes = new ArrayList<Object>();
66  
67          for (int i = 0; i < args.length; i++) {
68              if (args[i] == null) {
69                  _log.error(
70                      "Cannot invoke " + className + " " + methodName +
71                          " on position " + i + " because it is null");
72              }
73  
74              Class<?> argClass = args[i].getClass();
75  
76              if (ClassUtil.isSubclass(argClass, PrimitiveWrapper.class)) {
77                  parameterTypes.add(argClass.getField("TYPE").get(args[i]));
78  
79                  MethodKey methodKey = new MethodKey(
80                      argClass.getName(), "getValue", null);
81  
82                  Method method = MethodCache.get(methodKey);
83  
84                  args[i] = method.invoke(args[i], (Object[])null);
85              }
86              else if (args[i] instanceof NullWrapper) {
87                  NullWrapper nullWrapper = (NullWrapper)args[i];
88  
89                  String wrappedClassName = nullWrapper.getClassName();
90  
91                  if (wrappedClassName.startsWith(StringPool.OPEN_BRACKET) &&
92                      wrappedClassName.endsWith(StringPool.SEMICOLON)) {
93  
94                      wrappedClassName = wrappedClassName.substring(
95                          2, wrappedClassName.length() - 1);
96  
97                      Class<?> wrappedClass = contextClassLoader.loadClass(
98                          wrappedClassName);
99  
100                     parameterTypes.add(
101                         Array.newInstance(wrappedClass, 0).getClass());
102                 }
103                 else {
104                     Class<?> wrappedClass = contextClassLoader.loadClass(
105                         wrappedClassName);
106 
107                     parameterTypes.add(wrappedClass);
108                 }
109 
110                 args[i] = null;
111             }
112             else {
113                 parameterTypes.add(argClass);
114             }
115         }
116 
117         Object classObj = contextClassLoader.loadClass(className);
118 
119         if (newInstance) {
120             classObj = ((Class<?>)classObj).newInstance();
121         }
122 
123         Method method = null;
124 
125         try {
126             MethodKey methodKey = new MethodKey(
127                 methodWrapper.getClassName(), methodWrapper.getMethodName(),
128                 parameterTypes.toArray(new Class[0]));
129 
130             method = MethodCache.get(methodKey);
131         }
132         catch (NoSuchMethodException nsme) {
133             Method[] methods = null;
134 
135             if (newInstance) {
136                 methods = classObj.getClass().getMethods();
137             }
138             else {
139                 methods = ((Class<?>)classObj).getMethods();
140             }
141 
142             for (int i = 0; i < methods.length; i++) {
143                 Class<?>[] methodParameterTypes =
144                     methods[i].getParameterTypes();
145 
146                 if (methods[i].getName().equals(methodName) &&
147                     methodParameterTypes.length == parameterTypes.size()) {
148 
149                     boolean correctParams = true;
150 
151                     for (int j = 0; j < parameterTypes.size(); j++) {
152                         Class<?> a = (Class<?>)parameterTypes.get(j);
153                         Class<?> b = methodParameterTypes[j];
154 
155                         if (!ClassUtil.isSubclass(a, b)) {
156                             correctParams = false;
157 
158                             break;
159                         }
160                     }
161 
162                     if (correctParams) {
163                         method = methods[i];
164 
165                         break;
166                     }
167                 }
168             }
169 
170             if (method == null) {
171                 throw nsme;
172             }
173         }
174 
175         Object returnObj = null;
176 
177         if (method != null) {
178             returnObj = method.invoke(classObj, args);
179         }
180 
181         return returnObj;
182     }
183 
184     private static Log _log = LogFactoryUtil.getLog(MethodInvoker.class);
185 
186 }