001: /*
002: * $Header: /export/home/cvsroot/MyPersonalizerRepository/MyPersonalizer/Subsystems/Kernel/Sources/es/udc/mypersonalizer/kernel/model/repository/sql/storers/PropertyStorageStrategyRegistrySingleton.java,v 1.1.1.1 2004/03/25 12:08:36 fbellas Exp $
003: * $Revision: 1.1.1.1 $
004: * $Date: 2004/03/25 12:08:36 $
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.kernel.model.repository.sql.storers;
042:
043: import es.udc.mypersonalizer.kernel.config.PropertyStorageStrategyRegistrySingletonConfig;
044: import es.udc.mypersonalizer.kernel.config.KernelConfig;
045: import es.udc.mypersonalizer.kernel.config.KernelConfigManager;
046: import es.udc.mypersonalizer.kernel.log.Log;
047: import es.udc.mypersonalizer.kernel.log.LogManager;
048: import es.udc.mypersonalizer.kernel.log.LogNamingConventions;
049:
050: /**
051: * This singleton abstract class provides a way to get the storage
052: * strategy for a service specifiying its identifier.
053: * <p>
054: * This singleton class creates the concrete singleton on run-time the first
055: * time is needed. The name of such a concrete class is obtained by using the
056: * standard "MyPersonalizer" configuration mechanism
057: * {@link es.udc.mypersonalizer.kernel.config.PropertyStorageStrategyRegistrySingletonConfig}).
058: * There is a configuration parameter that specifies the name of the concrete
059: * singleton class.
060: *
061: * @author Fernando Bellas
062: * @author Daniel Fernandez
063: * @author Abel Muinho
064: * @since 1.0
065: */
066: public abstract class PropertyStorageStrategyRegistrySingleton {
067:
068: /** The singleton instance. */
069: private static PropertyStorageStrategyRegistrySingleton singleton = null;
070:
071: /*
072: * It uses the standard "MyPersonalizer" configuration mechanism for
073: * getting the name of the concrete singleton class, and creates the
074: * instance.
075: */
076: static {
077:
078: try {
079: KernelConfig kernelConfig = KernelConfigManager.getConfig();
080:
081: PropertyStorageStrategyRegistrySingletonConfig propertyStorageStrategyRegistrySingletonConfig = kernelConfig
082: .getKernelModelConfig()
083: .getPropertyStorageStrategyRegistrySingletonConfig();
084:
085: String className = propertyStorageStrategyRegistrySingletonConfig
086: .getClassName();
087:
088: Class singletonClass = Class.forName(className);
089: singleton = (PropertyStorageStrategyRegistrySingleton) singletonClass
090: .newInstance();
091:
092: } catch (Exception e) {
093:
094: Log mypersonalizerLog = LogManager
095: .getLog(LogNamingConventions.MYPERSONALIZER);
096: mypersonalizerLog
097: .write(
098: "Could not initialize configuration for "
099: + "PropertyStorageStrategyRegistrySingleton",
100: e,
101: PropertyStorageStrategyRegistrySingleton.class);
102:
103: }
104:
105: }
106:
107: /**
108: * Creates an instance of this class
109: */
110: protected PropertyStorageStrategyRegistrySingleton() {
111: }
112:
113: /**
114: * Gets the singleton.
115: *
116: * @return the singleton
117: */
118: public static PropertyStorageStrategyRegistrySingleton getInstance() {
119: return singleton;
120: }
121:
122: /**
123: * Returns a storage strategy for the specified service identifier.
124: *
125: * @param serviceIdentifier the identifier of the service which
126: * storage strategy is to be retrieved.
127: * @return a storage strategy for the specified service identifier
128: */
129: public abstract PropertyStorageStrategy getPropertyStorageStrategy(
130: String serviceIdentifier);
131:
132: }
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