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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.List; 58 59 import org.apache.commons.logging.Log; 60 import org.apache.commons.logging.LogFactory; 61 62 import org.apache.torque.engine.EngineException; 63 64 /*** 65 * A <code>NameGenerator</code> implementation for table-specific 66 * constraints. Conforms to the maximum column name length for the 67 * type of database in use. 68 * 69 * @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a> 70 * @version $Id: ConstraintNameGenerator.java,v 1.2 2003/06/26 06:59:56 mpoeschl Exp $ 71 */ 72 public class ConstraintNameGenerator implements NameGenerator 73 { 74 /*** Logging class from commons.logging */ 75 private static Log log = LogFactory.getLog(ConstraintNameGenerator.class); 76 77 /*** 78 * First element of <code>inputs</code> should be of type {@link 79 * org.apache.torque.engine.database.model.Database}, second 80 * should be a table name, third is the type identifier (spared if 81 * trimming is necessary due to database type length constraints), 82 * and the fourth is a <code>Integer</code> indicating the number 83 * of this contraint. 84 * 85 * @see org.apache.torque.engine.database.model.NameGenerator 86 */ 87 public String generateName(List inputs) 88 throws EngineException 89 { 90 StringBuffer name = new StringBuffer(); 91 Database db = (Database) inputs.get(0); 92 name.append((String) inputs.get(1)); 93 String namePostfix = (String) inputs.get(2); 94 String constraintNbr = inputs.get(3).toString(); 95 96 // Calculate maximum RDBMS-specific column character limit. 97 int maxBodyLength = -1; 98 try 99 { 100 int maxColumnNameLength = 101 Integer.parseInt(db.getProperty("maxColumnNameLength")); 102 maxBodyLength = (maxColumnNameLength - namePostfix.length() 103 - constraintNbr.length() - 2); 104 105 if (log.isDebugEnabled()) 106 { 107 log.debug("maxColumnNameLength=" + maxColumnNameLength 108 + " maxBodyLength=" + maxBodyLength); 109 } 110 } 111 catch (EngineException e) 112 { 113 log.error(e.getMessage(), e); 114 } 115 catch (NumberFormatException maxLengthUnknown) 116 { 117 } 118 119 // Do any necessary trimming. 120 if (maxBodyLength != -1 && name.length() > maxBodyLength) 121 { 122 name.setLength(maxBodyLength); 123 } 124 125 name.append(STD_SEPARATOR_CHAR).append(namePostfix) 126 .append(STD_SEPARATOR_CHAR).append(constraintNbr); 127 128 return name.toString(); 129 } 130 }

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