001: /*
002: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Portal/Sources/es/udc/mypersonalizer/portal/model/wizards/PropertyUpdaterRegistrySingleton.java,v 1.1.1.1 2004/03/25 12:08:40 fbellas Exp $
003: * $Revision: 1.1.1.1 $
004: * $Date: 2004/03/25 12:08:40 $
005: *
006: * =============================================================================
007: *
008: * Copyright (c) 2003, The MyPersonalizer Development Group
009: * (http://www.tic.udc.es/~fbellas/mypersonalizer/index.html) at
010: * University Of A Coruna
011: * All rights reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions are met:
015: *
016: * - Redistributions of source code must retain the above copyright notice,
017: * this list of conditions and the following disclaimer.
018: *
019: * - Redistributions in binary form must reproduce the above copyright notice,
020: * this list of conditions and the following disclaimer in the documentation
021: * and/or other materials provided with the distribution.
022: *
023: * - Neither the name of the University Of A Coruna nor the names of its
024: * contributors may be used to endorse or promote products derived from
025: * this software without specific prior written permission.
026: *
027: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
028: * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
029: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
030: * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
031: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
032: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
033: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
034: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
035: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
036: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
037: * POSSIBILITY OF SUCH DAMAGE.
038: *
039: */
040:
041: package es.udc.mypersonalizer.portal.model.wizards;
042:
043: import java.util.HashMap;
044: import java.util.Iterator;
045: import java.util.List;
046: import java.util.Map;
047:
048: import es.udc.mypersonalizer.kernel.log.Log;
049: import es.udc.mypersonalizer.kernel.log.LogManager;
050: import es.udc.mypersonalizer.kernel.log.LogNamingConventions;
051: import es.udc.mypersonalizer.portal.config.PortalConfig;
052: import es.udc.mypersonalizer.portal.config.PortalConfigManager;
053: import es.udc.mypersonalizer.portal.config.PropertyUpdaterConfig;
054: import es.udc.mypersonalizer.portal.config.PropertyUpdaterRegistryConfig;
055:
056: /**
057: * This singleton class provides a registry for all the property updaters which
058: * are present in the system. These property updaters are read from
059: * configuration into a {@link PropertyUpdaterConfig} object, which is used by
060: * this class.
061: *
062: * @author Daniel Fernandez
063: * @since 1.0
064: */
065: public class PropertyUpdaterRegistrySingleton {
066:
067: /**
068: * The singleton instance.
069: */
070: private static PropertyUpdaterRegistrySingleton instance = null;
071:
072: /**
073: * The Map which contains the property updater objects, indexed by its
074: * name.
075: */
076: private Map propertyUpdaters = null;
077:
078: /**
079: * This constructor avoid direct instantiation of this class and also
080: * performs all the initialization needed. It reads the names and classes
081: * of the property updaters from the configuration, instantiates them
082: * and puts them into the registry.
083: */
084: private PropertyUpdaterRegistrySingleton() {
085:
086: try {
087:
088: PortalConfig portalConfig = PortalConfigManager.getConfig();
089:
090: PropertyUpdaterRegistryConfig propertyUpdaterRegistryConfig = portalConfig
091: .getPortalModelConfig()
092: .getPropertyUpdaterRegistryConfig();
093:
094: List propertyUpdaterConfigs = propertyUpdaterRegistryConfig
095: .getPropertyUpdaterConfigs();
096:
097: propertyUpdaters = new HashMap();
098:
099: Iterator propertyUpdaterIter = propertyUpdaterConfigs
100: .iterator();
101: while (propertyUpdaterIter.hasNext()) {
102:
103: PropertyUpdaterConfig propertyUpdaterConfig = (PropertyUpdaterConfig) propertyUpdaterIter
104: .next();
105: String name = propertyUpdaterConfig.getName();
106: String className = propertyUpdaterConfig.getClassName();
107:
108: Class updaterClass = Class.forName(className);
109: PropertyUpdater updaterInstance = (PropertyUpdater) updaterClass
110: .newInstance();
111:
112: propertyUpdaters.put(name, updaterInstance);
113:
114: }
115:
116: } catch (Exception e) {
117:
118: Log mypersonalizerLog = LogManager
119: .getLog(LogNamingConventions.MYPERSONALIZER);
120: mypersonalizerLog.write(
121: "Could not initialize configuration for "
122: + "PropertyUpdaterRegistrySingleton", e,
123: PropertyUpdaterRegistrySingleton.class);
124:
125: }
126:
127: }
128:
129: /**
130: * Returns the singleton instance.
131: *
132: * @return the singleton instance.
133: */
134: public static PropertyUpdaterRegistrySingleton getInstance() {
135: if (instance == null) {
136: instance = new PropertyUpdaterRegistrySingleton();
137: }
138: return instance;
139: }
140:
141: /**
142: * This method returns the adequate property updater, taking it from
143: * the registry by its name.
144: *
145: * @param name the name of the wanted property updater.
146: * @return the needed property updater, null if it is not found.
147: */
148: public PropertyUpdater getPropertyUpdater(String name) {
149: return ((PropertyUpdater) propertyUpdaters.get(name));
150: }
151:
152: }
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