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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 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.List; 58 59 /*** 60 * Information about unique columns of a table. This class assumes 61 * that in the underlying RDBMS, unique constraints and unique indices 62 * are roughly equivalent. For example, adding a unique constraint to 63 * a column also creates an index on that column (this is known to be 64 * true for MySQL and Oracle). 65 * 66 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a> 67 * @author <a href="mailto:dlr@collab.net">Daniel Rall</a> 68 * @version $Id: Unique.java,v 1.1 2003/02/10 13:20:58 mpoeschl Exp $ 69 */ 70 public class Unique extends Index 71 { 72 /*** 73 * Returns <code>true</code>. 74 * 75 * @return true 76 */ 77 public final boolean isUnique() 78 { 79 return true; 80 } 81 82 /*** 83 * String representation of the index. This is an xml representation. 84 * 85 * @return string representation in xml 86 */ 87 public String toString() 88 { 89 StringBuffer result = new StringBuffer(); 90 result.append(" <unique name=\"") 91 .append(getName()) 92 .append("\">\n"); 93 94 List columns = getColumns(); 95 for (int i = 0; i < columns.size(); i++) 96 { 97 result.append(" <unique-column name=\"") 98 .append(columns.get(i)) 99 .append("\"/>\n"); 100 } 101 result.append(" </unique>\n"); 102 return result.toString(); 103 } 104 }

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