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


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
20 import java.lang.reflect.InvocationTargetException JavaDoc;
21 import java.lang.reflect.Method JavaDoc;
22
23 import org.apache.commons.logging.Log;
24
25 /**
26  * Abstract class that is used to execute an arbitrary
27  * method that is in introspected. This is the superclass
28  * for the GetExecutor and PropertyExecutor.
29  *
30  * @since 1.0
31  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
32  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
33  * @version $Id: AbstractExecutor.java 398171 2006-04-29 14:57:29Z dion $
34  */
35 public abstract class AbstractExecutor {
36     /** The executor instance log. */
37     protected Log rlog = null;
38     
39     /**
40      * Method to be executed.
41      */
42     protected Method JavaDoc method = null;
43     
44     /**
45      * Execute method against context.
46      *
47      * @param o The owner.
48      * @return The return value.
49      * @throws IllegalAccessException Method is inaccessible.
50      * @throws InvocationTargetException Method body throws an exception.
51      */
52      public abstract Object JavaDoc execute(Object JavaDoc o)
53          throws IllegalAccessException JavaDoc, InvocationTargetException JavaDoc;
54
55     /**
56      * Tell whether the executor is alive by looking
57      * at the value of the method.
58      *
59      * @return boolean Whether the executor is alive.
60      */
61     public boolean isAlive() {
62         return (method != null);
63     }
64
65     /**
66      * Get the method to be executed.
67      *
68      * @return Method The method to be executed.
69      */
70     public Method JavaDoc getMethod() {
71         return method;
72     }
73 }
74
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