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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;
21  import java.lang.reflect.Method;
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   * @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 1.3 2004/02/28 13:45:21 yoavs Exp $
33   */
34  public abstract class AbstractExecutor
35  {
36      protected Log rlog = null;
37      
38      /***
39       * Method to be executed.
40       */
41      protected Method method = null;
42      
43      /***
44       * Execute method against context.
45       */
46       public abstract Object execute(Object o)
47           throws IllegalAccessException, InvocationTargetException;
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 getMethod()
59      {
60          return method;
61      }
62  }