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Java > Open Source Codes > org > apache > tapestry > engine > state > NamedClassStateObjectFactory


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.engine.state;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.hivemind.ClassResolver;
19 import org.apache.hivemind.impl.BaseLocatable;
20
21 /**
22  * Used to instantiate the a state object from a configurable class name.
23  *
24  * @author Howard M. Lewis Ship
25  * @since 4.0
26  */
27 public class NamedClassStateObjectFactory extends BaseLocatable implements StateObjectFactory
28 {
29     private ClassResolver _classResolver;
30
31     private String JavaDoc _className;
32
33     public Object JavaDoc createStateObject()
34     {
35         try
36         {
37             Class JavaDoc c = _classResolver.findClass(_className);
38
39             return c.newInstance();
40         }
41         catch (Exception JavaDoc ex)
42         {
43             throw new ApplicationRuntimeException(StateMessages.unableToInstantiateObject(
44                     _className,
45                     ex), getLocation(), ex);
46         }
47     }
48
49     public void setClassName(String JavaDoc className)
50     {
51         _className = className;
52     }
53     
54     public String JavaDoc getClassName()
55     {
56         return _className;
57     }
58     
59     public void setClassResolver(ClassResolver classResolver)
60     {
61         _classResolver = classResolver;
62     }
63
64  
65 }
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