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Java > Open Source Codes > com > sun > appserv > management > util > misc > StringSourceBase


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23  
24 /*
25  * $Header: /cvs/glassfish/admin-core/mbeanapi/src/java/com/sun/appserv/management/util/misc/StringSourceBase.java,v 1.3 2005/12/25 03:51:53 tcfujii Exp $
26  * $Revision: 1.3 $
27  * $Date: 2005/12/25 03:51:53 $
28  */
29  
30 package com.sun.appserv.management.util.misc;
31
32 /**
33     Default base class for StringSource implementationsn.
34  */
35 public class StringSourceBase implements StringSource
36 {
37     private final StringSource mNext;
38     
39     private final static class EmptyStringSource implements StringSource
40     {
41         public final static EmptyStringSource INSTANCE = new EmptyStringSource();
42         public EmptyStringSource() {}
43         public String JavaDoc getString( String JavaDoc id ) { return( id ); }
44         public String JavaDoc getString( String JavaDoc id, String JavaDoc defaultValue ) { return( defaultValue ); }
45     }
46     
47         public
48     StringSourceBase()
49     {
50         this( EmptyStringSource.INSTANCE );
51     }
52     
53         public
54     StringSourceBase( StringSource next )
55     {
56         mNext = next == null ? EmptyStringSource.INSTANCE : next;
57     }
58     
59         public String JavaDoc
60     getString( String JavaDoc id )
61     {
62         return( getString( id, id ) );
63     }
64     
65         public String JavaDoc
66     getString( String JavaDoc id, String JavaDoc defaultValue )
67     {
68         return( mNext.getString( id, defaultValue ) );
69     }
70 };
71
72
73
74
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