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Java > Open Source Codes > org > apache > tapestry > util > SystemPropertiesPropertySource


1 // Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
14

15 package org.apache.tapestry.util;
16
17 import org.apache.tapestry.engine.IPropertySource;
18
19 /**
20  * Obtain properties from JVM system properties.
21  *
22  *
23  * @author Howard Lewis Ship
24  * @since 2.3
25  *
26  **/

27
28 public class SystemPropertiesPropertySource implements IPropertySource
29 {
30     private static IPropertySource _shared;
31     
32     public static synchronized IPropertySource getInstance()
33     {
34         if (_shared == null)
35             _shared = new SystemPropertiesPropertySource();
36             
37         return _shared;
38     }
39
40     /**
41      * Delegates to {@link System#getProperty(java.lang.String)}.
42      *
43      **/

44     
45     public String JavaDoc getPropertyValue(String JavaDoc propertyName)
46     {
47         return System.getProperty(propertyName);
48     }
49
50 }
51
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