SystemPropertyModule


1   /*
2   * Copyright 1999-2005 The Apache Software Foundation
3   *
4   * Licensed under the Apache License, Version 2.0 (the "License");
5   * you may not use this file except in compliance with the License.
6   * You may obtain a copy of the License at
7   *
8   *     http://www.apache.org/licenses/LICENSE-2.0
9   *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16  package org.apache.cocoon.components.modules.input;
17  
18  import org.apache.avalon.framework.configuration.Configuration;
19  import org.apache.avalon.framework.thread.ThreadSafe;
20  
21  import java.util.Map  ;
22  
23  /**
24   * SystemPropertyModule is an JXPath based InputModule implementation that
25   * provides access to system properties.
26   * Available system properties are defined by Java's <a
27   * HREF="http://java.sun.com/j2se/1.4.1/docs/api/java/lang/System.html#getProperties()">System.getProperties()</a>.
28   *
29   * JXPath allows to apply XPath functions to system properties.
30   *
31   * <p>If there is a security manager, its <code>checkPropertiesAccess</code>
32   * method is called with no arguments. This may result in a security exception
33   * which is wrapped into a configuration exception and re-thrown.</p>
34   *
35   * @author Konstantin Piroumian
36   * @version $Id: SystemPropertyModule.java 169479 2005-05-10 14:27:45Z vgritsenko $
37   */
38  public class SystemPropertyModule extends AbstractJXPathModule
39                                    implements ThreadSafe {
40  
41      /**
42       * @throws SecurityException if access is denied
43       */
44      protected Object   getContextObject(Configuration modeConf,
45                                        Map   objectModel) {
46          return System.getProperties();
47      }
48  }
49
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