001 package echopoint.util;
002 /*
003 * This file is part of the Echo Point Project. This project is a collection
004 * of Components that have extended the Echo Web Application Framework.
005 *
006 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
007 *
008 * The contents of this file are subject to the Mozilla Public License Version
009 * 1.1 (the "License"); you may not use this file except in compliance with
010 * the License. You may obtain a copy of the License at
011 * http://www.mozilla.org/MPL/
012 *
013 * Software distributed under the License is distributed on an "AS IS" basis,
014 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
015 * for the specific language governing rights and limitations under the
016 * License.
017 *
018 * Alternatively, the contents of this file may be used under the terms of
019 * either the GNU General Public License Version 2 or later (the "GPL"), or
020 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
021 * in which case the provisions of the GPL or the LGPL are applicable instead
022 * of those above. If you wish to allow use of your version of this file only
023 * under the terms of either the GPL or the LGPL, and not to allow others to
024 * use your version of this file under the terms of the MPL, indicate your
025 * decision by deleting the provisions above and replace them with the notice
026 * and other provisions required by the GPL or the LGPL. If you do not delete
027 * the provisions above, a recipient may use your version of this file under
028 * the terms of any one of the MPL, the GPL or the LGPL.
029 */
030
031 /*
032 * This class is take almost directly from the base Echo 2 class library
033 * and hence is Copyright (C) 2002-2005 NextApp, Inc. It was made part of
034 * this code base on 11/05/2005
035 */
036
037 /*
038 * This file is part of the Echo Web Application Framework (hereinafter "Echo").
039 * Copyright (C) 2002-2005 NextApp, Inc.
040 *
041 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
042 *
043 * The contents of this file are subject to the Mozilla Public License Version
044 * 1.1 (the "License"); you may not use this file except in compliance with
045 * the License. You may obtain a copy of the License at
046 * http://www.mozilla.org/MPL/
047 *
048 * Software distributed under the License is distributed on an "AS IS" basis,
049 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
050 * for the specific language governing rights and limitations under the
051 * License.
052 *
053 * Alternatively, the contents of this file may be used under the terms of
054 * either the GNU General Public License Version 2 or later (the "GPL"), or
055 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
056 * in which case the provisions of the GPL or the LGPL are applicable instead
057 * of those above. If you wish to allow use of your version of this file only
058 * under the terms of either the GPL or the LGPL, and not to allow others to
059 * use your version of this file under the terms of the MPL, indicate your
060 * decision by deleting the provisions above and replace them with the notice
061 * and other provisions required by the GPL or the LGPL. If you do not delete
062 * the provisions above, a recipient may use your version of this file under
063 * the terms of any one of the MPL, the GPL or the LGPL.
064 */
065
066
067 import java.io.IOException;
068 import java.util.HashMap;
069 import java.util.Iterator;
070 import java.util.Map;
071
072 import nextapp.echo.app.util.PropertiesDiscovery;
073
074 /**
075 * A PeerFactory that can return and peer object instance
076 * for a given string (rather than use class name
077 * which is what PeerFactory does)
078 */
079 public class StringPeerFactory {
080
081 private final Map stringToPeerMap = new HashMap();
082
083 public StringPeerFactory(String resourceName, ClassLoader classLoader) {
084 try {
085 Map peerNameMap = PropertiesDiscovery.loadProperties(resourceName, classLoader);
086 Iterator it = peerNameMap.keySet().iterator();
087 while (it.hasNext()) {
088 String stringValue = (String) it.next();
089 String peerClassName = (String) peerNameMap.get(stringValue);
090 Class peerClass = classLoader.loadClass(peerClassName);
091 Object peer = peerClass.newInstance();
092 stringToPeerMap.put(stringValue, peer);
093 }
094 } catch (ClassNotFoundException ex) {
095 throw new RuntimeException("Unable to load string peer bindings: " + ex);
096 } catch (IOException ex) {
097 throw new RuntimeException("Unable to load string peer bindings: " + ex);
098 } catch (InstantiationException ex) {
099 throw new RuntimeException("Unable to load string peer bindings: " + ex);
100 } catch (IllegalAccessException ex) {
101 throw new RuntimeException("Unable to load string peer bindings: " + ex);
102 }
103 }
104
105
106 /**
107 * Retrieves the appropriate peer instance for a given
108 * <code>String</code>.
109 *
110 * @param matchString - the string to match
111 * @return the relevant peer, or null if none can be found
112 */
113 public Object getPeer(String matchString) {
114 Object peer = null;
115 peer = stringToPeerMap.get(matchString);
116 if (peer != null) {
117 return peer;
118 }
119 return null;
120 }
121 }
122