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Java > Open Source Codes > org > apache > avalon > fortress > impl > lookup > NoopServiceManager


1 /*
2  * Copyright 2003-2004 The Apache Software Foundation
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
12  * implied.
13  *
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18 package org.apache.avalon.fortress.impl.lookup;
19
20 import org.apache.avalon.framework.service.ServiceException;
21 import org.apache.avalon.framework.service.ServiceManager;
22
23 /**
24  * No-op ServiceManager contains no components, and is used when we don't want to allow a component to access other
25  * components.
26  *
27  * @author <a HREF="mailto:dev@avalon.apache.org">Avalon Development Team</a>
28  * @version CVS $ Revision: 1.1 $
29  */
30 public class NoopServiceManager implements ServiceManager
31 {
32     private static final String JavaDoc MESSAGE = "Could not return a reference to the Component";
33
34     public Object JavaDoc lookup( String JavaDoc role ) throws ServiceException
35     {
36         throw new ServiceException(role, MESSAGE);
37     }
38
39     public boolean hasService( String JavaDoc role )
40     {
41         return false;
42     }
43
44     public void release( Object JavaDoc component )
45     {
46         // Do nothing
47 }
48 }
49
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