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1 package org.apache.torque.engine.database.model; 2 3 /* ==================================================================== 4 * The Apache Software License, Version 1.1 5 * 6 * Copyright (c) 2001-2003 The Apache Software Foundation. All rights 7 * reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The end-user documentation included with the redistribution, 22 * if any, must include the following acknowledgment: 23 * "This product includes software developed by the 24 * Apache Software Foundation (http://www.apache.org/)." 25 * Alternately, this acknowledgment may appear in the software itself, 26 * if and wherever such third-party acknowledgments normally appear. 27 * 28 * 4. The names "Apache" and "Apache Software Foundation" and 29 * "Apache Turbine" must not be used to endorse or promote products 30 * derived from this software without prior written permission. For 31 * written permission, please contact apache@apache.org. 32 * 33 * 5. Products derived from this software may not be called "Apache", 34 * "Apache Turbine", nor may "Apache" appear in their name, without 35 * prior written permission of the Apache Software Foundation. 36 * 37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * ==================================================================== 50 * 51 * This software consists of voluntary contributions made by many 52 * individuals on behalf of the Apache Software Foundation. For more 53 * information on the Apache Software Foundation, please see 54 * <http://www.apache.org/>. 55 */ 56 57 import java.util.Hashtable; 58 import java.util.List; 59 60 import org.apache.torque.engine.EngineException; 61 62 /*** 63 * A name generation factory. 64 * 65 * @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a> 66 * @version $Id: NameFactory.java,v 1.5 2003/08/04 05:30:29 mpoeschl Exp $ 67 */ 68 public class NameFactory 69 { 70 /*** 71 * The fully qualified class name of the Java name generator. 72 */ 73 public static final String JAVA_GENERATOR = 74 JavaNameGenerator.class.getName(); 75 76 /*** 77 * The fully qualified class name of the constraint name generator. 78 */ 79 public static final String CONSTRAINT_GENERATOR = 80 ConstraintNameGenerator.class.getName(); 81 82 /*** 83 * The single instance of this class. 84 */ 85 private static NameFactory instance = new NameFactory(); 86 87 /*** 88 * The cache of <code>NameGenerator</code> algorithms in use for 89 * name generation, keyed by fully qualified class name. 90 */ 91 private Hashtable algorithms; 92 93 /*** 94 * Creates a new instance with storage for algorithm implementations. 95 */ 96 protected NameFactory() 97 { 98 algorithms = new Hashtable(5); 99 } 100 101 /*** 102 * Factory method which retrieves an instance of the named generator. 103 * 104 * @param name The fully qualified class name of the name 105 * generation algorithm to retrieve. 106 * @return A name generator 107 */ 108 protected NameGenerator getAlgorithm(String name) 109 throws EngineException 110 { 111 synchronized (algorithms) 112 { 113 NameGenerator algorithm = (NameGenerator) algorithms.get(name); 114 if (algorithm == null) 115 { 116 try 117 { 118 algorithm = 119 (NameGenerator) Class.forName(name).newInstance(); 120 } 121 catch (InstantiationException e) 122 { 123 throw new EngineException("Unable to instantiate class " 124 + name + ": Make sure it's in your run-time classpath", e); 125 } 126 catch (Exception e) 127 { 128 throw new EngineException(e); 129 } 130 algorithms.put(name, algorithm); 131 } 132 return algorithm; 133 } 134 } 135 136 /*** 137 * Given a list of <code>String</code> objects, implements an 138 * algorithm which produces a name. 139 * 140 * @param algorithmName The fully qualified class name of the 141 * {@link org.apache.torque.engine.database.model.NameGenerator} 142 * implementation to use to generate names. 143 * @param inputs Inputs used to generate a name. 144 * @return The generated name. 145 * @throws EngineException an exception 146 */ 147 public static String generateName(String algorithmName, List inputs) 148 throws EngineException 149 { 150 NameGenerator algorithm = instance.getAlgorithm(algorithmName); 151 return algorithm.generateName(inputs); 152 } 153 }

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