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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  import java.lang.reflect.InvocationTargetException;
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   * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
32   * @version $Id: GetExecutor.java,v 1.4 2004/02/28 13:45:21 yoavs Exp $
33   */
34  public class GetExecutor extends AbstractExecutor
35  {
36      /***
37       * Container to hold the 'key' part of 
38       * get(key).
39       */
40      private Object[] args = new Object[1];
41      
42      /***
43       * Default constructor.
44       */
45      public GetExecutor(Log r, org.apache.commons.jexl.util.introspection.Introspector ispect, Class c, String key)
46          throws Exception
47      {
48          rlog = r;
49          args[0] = key;
50          method = ispect.getMethod(c, "get", args);
51      }
52  
53      /***
54       * Execute method against context.
55       */
56      public Object execute(Object o)
57          throws IllegalAccessException, InvocationTargetException
58      {
59          if (method == null)
60              return null;
61  
62          return method.invoke(o, args);
63      }
64  
65  }
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