/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb.plugins.cmp.jdbc;
import java.util.Map;
import java.util.HashMap;
/**
* This class manages aliases for generated queries.
*
* @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
* @version $Revision: 81030 $
*/
final class AliasManager
{
private static final String RELATION_TABLE_SUFFIX = "_RELATION_TABLE";
private final String prefix;
private final String suffix;
private final int maxLength;
private final Map aliases = new HashMap();
private final Map relationTableAliases = new HashMap();
private int count = 0;
public AliasManager(String prefix, String suffix, int maxLength)
{
this.prefix = prefix;
this.suffix = suffix;
this.maxLength = maxLength;
}
public String getAlias(String path)
{
String alias = (String)aliases.get(path);
if(alias == null)
{
alias = createAlias(path);
aliases.put(path, alias);
}
return alias;
}
private String createAlias(String path)
{
StringBuffer alias = new StringBuffer();
alias.append(prefix).append(count++).append(suffix);
alias.append(path.replace('.', '_'));
return alias.substring(0, Math.min(maxLength, alias.length()));
}
public void addAlias(String path, String alias)
{
aliases.put(path, alias);
}
public String getRelationTableAlias(String path)
{
String relationTableAlias = (String)relationTableAliases.get(path);
if(relationTableAlias == null)
{
relationTableAlias = createRelationTableAlias(path);
relationTableAliases.put(path, relationTableAlias);
}
return relationTableAlias;
}
private String createRelationTableAlias(String path)
{
StringBuffer relationTableAlias = new StringBuffer();
relationTableAlias.append(prefix).append(count++).append(suffix);
relationTableAlias.append(path.replace('.', '_'));
relationTableAlias.append(RELATION_TABLE_SUFFIX);
return relationTableAlias.substring(
0, Math.min(maxLength, relationTableAlias.length()));
}
}