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Java > Open Source Codes > org > apache > commons > jexl > util > GetExecutor


1 /*
2  * Copyright 2000-2001,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package org.apache.commons.jexl.util;
18
19 import java.lang.reflect.InvocationTargetException JavaDoc;
20
21 import org.apache.commons.logging.Log;
22
23
24 /**
25  * Executor that simply tries to execute a get(key)
26  * operation. This will try to find a get(key) method
27  * for any type of object, not just objects that
28  * implement the Map interface as was previously
29  * the case.
30  *
31  * @since 1.0
32  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
33  * @version $Id: GetExecutor.java 398171 2006-04-29 14:57:29Z dion $
34  */
35 public class GetExecutor extends AbstractExecutor {
36     /**
37      * Container to hold the 'key' part of
38      * get(key).
39      */
40     private final Object JavaDoc[] args = new Object JavaDoc[1];
41     
42     /**
43      * Default constructor.
44      *
45      * @param r The instance log.
46      * @param ispect The JEXL introspector.
47      * @param c The class being examined.
48      * @param key The key for the get(key) operation.
49      * @throws Exception Failure while trying to obtain the pertinent method.
50      */
51     public GetExecutor(Log r,
52             org.apache.commons.jexl.util.introspection.Introspector ispect,
53             Class JavaDoc c, String JavaDoc key) throws Exception JavaDoc {
54         rlog = r;
55         args[0] = key;
56         method = ispect.getMethod(c, "get", args);
57     }
58
59     /**
60      * {@inheritDoc}
61      */
62     public Object JavaDoc execute(Object JavaDoc o)
63     throws IllegalAccessException JavaDoc, InvocationTargetException JavaDoc {
64         if (method == null) {
65             return null;
66         }
67
68         return method.invoke(o, args);
69     }
70
71 }
72
73
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