KickJava   Java API By Example, From Geeks To Geeks.

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


1 package org.apache.velocity.runtime.parser.node;
2 /*
3  * Copyright 2000-2001,2004 The Apache Software Foundation.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 import org.apache.velocity.context.InternalContextAdapter;
19 import org.apache.velocity.util.introspection.Introspector;
20
21 import java.lang.reflect.InvocationTargetException JavaDoc;
22 import org.apache.velocity.exception.MethodInvocationException;
23
24 import org.apache.velocity.runtime.RuntimeLogger;
25
26
27 /**
28  * Executor that simply tries to execute a get(key)
29  * operation. This will try to find a get(key) method
30  * for any type of object, not just objects that
31  * implement the Map interface as was previously
32  * the case.
33  *
34  * @author <a HREF="mailto:jvanzyl@apache.org">Jason van Zyl</a>
35  * @version $Id: GetExecutor.java,v 1.8.4.1 2004/03/03 23:22:59 geirm Exp $
36  */
37 public class GetExecutor extends AbstractExecutor
38 {
39     /**
40      * Container to hold the 'key' part of
41      * get(key).
42      */
43     private Object JavaDoc[] args = new Object JavaDoc[1];
44     
45     /**
46      * Default constructor.
47      */
48     public GetExecutor(RuntimeLogger r, Introspector ispect, Class JavaDoc c, String JavaDoc key)
49         throws Exception JavaDoc
50     {
51         rlog = r;
52         args[0] = key;
53         method = ispect.getMethod(c, "get", args);
54     }
55
56     /**
57      * Execute method against context.
58      */
59     public Object JavaDoc execute(Object JavaDoc o)
60         throws IllegalAccessException JavaDoc, InvocationTargetException JavaDoc
61     {
62         if (method == null)
63             return null;
64
65         return method.invoke(o, args);
66     }
67
68     /**
69      * Execute method against context.
70      */
71     public Object JavaDoc OLDexecute(Object JavaDoc o, InternalContextAdapter context)
72         throws IllegalAccessException JavaDoc, MethodInvocationException
73     {
74         if (method == null)
75             return null;
76      
77         try
78         {
79             return method.invoke(o, args);
80         }
81         catch(InvocationTargetException JavaDoc ite)
82         {
83             /*
84              * the method we invoked threw an exception.
85              * package and pass it up
86              */
87
88             throw new MethodInvocationException(
89                 "Invocation of method 'get(\"" + args[0] + "\")'"
90                 + " in " + o.getClass()
91                 + " threw exception "
92                 + ite.getTargetException().getClass(),
93                 ite.getTargetException(), "get");
94         }
95         catch(IllegalArgumentException JavaDoc iae)
96         {
97             return null;
98         }
99     }
100 }
101
102
103
104
105
106
107
108
109
110
Popular Tags