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Java > Open Source Codes > org > apache > servicemix > beanflow > support > MethodReflector


1 /*
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package org.apache.servicemix.beanflow.support;
18
19 import java.lang.reflect.InvocationTargetException JavaDoc;
20 import java.lang.reflect.Method JavaDoc;
21 import java.util.concurrent.Callable JavaDoc;
22
23 /**
24  * A reflection based implementation of {@link Callable}
25  *
26  * @version $Revision: $
27  */
28 public class MethodReflector<T> implements Callable JavaDoc<T> {
29
30     protected static final Object JavaDoc[] NO_ARGUMENTS = {};
31
32     private final Object JavaDoc source;
33     private final Method JavaDoc method;
34     private final Object JavaDoc[] arguments;
35
36     public MethodReflector(Object JavaDoc source, Method JavaDoc method) {
37         this(source, method, NO_ARGUMENTS);
38     }
39
40     public MethodReflector(Object JavaDoc source, Method JavaDoc method, Object JavaDoc[] arguments) {
41         this.source = source;
42         this.method = method;
43         this.arguments = arguments;
44     }
45
46     @SuppressWarnings JavaDoc("unchecked")
47     public T call() throws Exception JavaDoc {
48         try {
49             return (T) method.invoke(source, arguments);
50         }
51         catch (InvocationTargetException JavaDoc e) {
52             Throwable JavaDoc targetException = e.getTargetException();
53             if (targetException instanceof Exception JavaDoc) {
54                 throw (Exception JavaDoc) targetException;
55             }
56             else {
57                 throw e;
58             }
59         }
60     }
61 }
62
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