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Java > Open Source Codes > org > apache > taglibs > xtags > xpath > ReflectionAction


1 /*
2  * Copyright 1999,2004 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.taglibs.xtags.xpath;
18
19
20
21 import java.lang.reflect.Method JavaDoc;
22
23 import org.dom4j.Node;
24 import org.dom4j.rule.Action;
25
26 /** Calls a void method on an instance when the action is fired.
27   *
28   * @author James Strachan
29   */
30 public class ReflectionAction implements Action {
31
32     protected static final Object JavaDoc[] NULL_ARGS = {};
33     
34     protected static final Class JavaDoc[] NULL_PARAMS = {};
35     
36     /** Holds the object on which to execute a method */
37     private Object JavaDoc object;
38     
39     /** The method to call */
40     private Method JavaDoc method;
41     
42     
43
44     public ReflectionAction( Object JavaDoc object, String JavaDoc methodName ) {
45         this.object = object;
46         Class JavaDoc theClass = object.getClass();
47         try {
48             this.method = theClass.getMethod( methodName, NULL_PARAMS );
49         }
50         catch (NoSuchMethodException JavaDoc e) {
51             System.out.println( "WARNING: " + getClass().getName() +
52                 ": Could not find method: " + methodName
53                 + " in class: " + theClass.getName()
54             );
55         }
56     }
57
58     public ReflectionAction( Object JavaDoc object, Method JavaDoc method ) {
59         this.object = object;
60         this.method = method;
61     }
62
63     
64     // Action interface
65 //-------------------------------------------------------------------------
66 public void run( Node node ) throws Exception JavaDoc {
67         //TagHelper.setContext(pageContext, node);
68 if ( method != null ) {
69             method.invoke( object, NULL_ARGS );
70         }
71     }
72 }
73
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