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Java > Open Source Codes > org > apache > velocity > runtime > parser > node > AbstractExecutor


1 package org.apache.velocity.runtime.parser.node;
2
3 /*
4  * Copyright 2000-2001,2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19
20 import java.lang.reflect.InvocationTargetException JavaDoc;
21 import java.lang.reflect.Method JavaDoc;
22
23 import org.apache.velocity.runtime.RuntimeLogger;
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  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
31  * @author <a HREF="mailto:geirm@apache.org">Geir Magnusson Jr.</a>
32  * @version $Id: AbstractExecutor.java,v 1.12.4.1 2004/03/03 23:22:59 geirm Exp $
33  */
34 public abstract class AbstractExecutor
35 {
36     protected RuntimeLogger rlog = null;
37     
38     /**
39      * Method to be executed.
40      */
41     protected Method JavaDoc method = null;
42     
43     /**
44      * Execute method against context.
45      */
46      public abstract Object JavaDoc execute(Object JavaDoc o)
47          throws IllegalAccessException JavaDoc, InvocationTargetException JavaDoc;
48
49     /**
50      * Tell whether the executor is alive by looking
51      * at the value of the method.
52      */
53     public boolean isAlive()
54     {
55         return (method != null);
56     }
57
58     public Method JavaDoc getMethod()
59     {
60         return method;
61     }
62 }
63
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