SystemPropertiesPropertySource


1   // Copyright 2004, 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.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   getPropertyValue(String   propertyName)
46      {
47          return System.getProperty(propertyName);
48      }
49  
50  }
51

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