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Posted to dev@turbine.apache.org by dl...@apache.org on 2001/08/22 22:07:34 UTC
cvs commit: jakarta-turbine-torque/src/java/org/apache/torque/engine/database/model ConstraintNameGenerator.java
dlr 01/08/22 13:07:34
Added: src/java/org/apache/torque/engine/database/model
ConstraintNameGenerator.java
Log:
A NameGenerator implementation for table-specific constraints.
Conforms to the maximum column name length for the type of database in
use.
Revision Changes Path
1.1 jakarta-turbine-torque/src/java/org/apache/torque/engine/database/model/ConstraintNameGenerator.java
Index: ConstraintNameGenerator.java
===================================================================
package org.apache.torque.engine.database.model;
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" and
* "Apache Turbine" must not be used to endorse or promote products
* derived from this software without prior written permission. For
* written permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* "Apache Turbine", nor may "Apache" appear in their name, without
* prior written permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
import java.util.List;
import org.apache.torque.Torque;
import org.apache.torque.TorqueException;
/**
* A <code>NameGenerator</code> implementation for table-specific
* constraints. Conforms to the maximum column name length for the
* type of database in use.
*
* @author <a href="mailto:dlr@finemaltcoding.com>Daniel Rall</a>
* @version $Id: ConstraintNameGenerator.java,v 1.1 2001/08/22 20:07:34 dlr Exp $
*/
public class ConstraintNameGenerator implements NameGenerator
{
/**
* Conditional compilation flag.
*/
private static final boolean DEBUG = false;
/**
* First element of <code>inputs</code> should be of type {@link
* org.apache.torque.engine.database.model.Database}, second
* should be a table name, third is the type identifier (spared if
* trimming is necessary due to database type length constraints),
* and the fourth is a <code>Integer</code> indicating the number
* of this contraint.
*
* @see org.apache.torque.engine.database.model.NameGenerator
*/
public String generateName(List inputs)
throws TorqueException
{
StringBuffer name = new StringBuffer();
Database db = (Database) inputs.get(0);
name.append((String) inputs.get(1));
String namePostfix = (String) inputs.get(2);
String constraintNbr = inputs.get(3).toString();
// Calculate maximum RDBMS-specific column character limit.
int maxBodyLength = -1;
try
{
int maxColumnNameLength =
Integer.parseInt(db.getProperty("maxColumnNameLength"));
maxBodyLength = (maxColumnNameLength - namePostfix.length() -
constraintNbr.length() - 2);
if (DEBUG)
{
System.out.println("maxColumnNameLength=" +
maxColumnNameLength + " maxBodyLength=" +
maxBodyLength);
}
}
catch (TorqueException e)
{
System.err.println(e.getMessage());
}
catch (NumberFormatException maxLengthUnknown)
{
}
// Do any necessary trimming.
if (maxBodyLength != -1 && name.length() > maxBodyLength)
{
name.setLength(maxBodyLength);
}
name.append(STD_SEPARATOR_CHAR).append(namePostfix)
.append(STD_SEPARATOR_CHAR).append(constraintNbr);
return name.toString();
}
}
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