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Java > Open Source Codes > nextapp > echo2 > app > util > PropertiesDiscovery


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package nextapp.echo2.app.util;
31
32 import java.io.IOException JavaDoc;
33 import java.io.InputStream JavaDoc;
34 import java.net.URL JavaDoc;
35 import java.util.Enumeration JavaDoc;
36 import java.util.HashMap JavaDoc;
37 import java.util.Map JavaDoc;
38 import java.util.Properties JavaDoc;
39
40 /**
41  * Utility class for retrieving property files matching a specific name
42  * across the CLASSPATH.
43  */
44 public class PropertiesDiscovery {
45
46     /**
47      * Returns a map containing the contents of all property files with
48      * the specified resource name.
49      *
50      * @param resourceName the name of the properties file(s) to load
51      * @return a map containing properties of all properties files
52      * in the CLASSPATH matching the specified
53      * <code>resourceName</code>
54      */
55     public static Map JavaDoc loadProperties(String JavaDoc resourceName, ClassLoader JavaDoc classLoader)
56     throws IOException JavaDoc {
57         Map JavaDoc propertyMap = new HashMap JavaDoc();
58         Enumeration JavaDoc resources = classLoader.getResources(resourceName);
59         while (resources.hasMoreElements()) {
60             URL JavaDoc resourceUrl = (URL JavaDoc) resources.nextElement();
61             Properties JavaDoc peerProperties = new Properties JavaDoc();
62             InputStream JavaDoc in = resourceUrl.openStream();
63             try {
64                 peerProperties.load(in);
65                 propertyMap.putAll(peerProperties);
66             } finally {
67                 in.close();
68             }
69         }
70         return propertyMap;
71     }
72     
73     /** Non-instantiable class. */
74     private PropertiesDiscovery() { }
75 }
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