package org.apache.ojb.broker.query;
/* Copyright 2002-2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* SelectionCriteria for [not] exists(sub query)
*
* @author <a href="mailto:jbraeuchi@gmx.ch">Jakob Braeuchi</a>
* @version $Id: ExistsCriteria.java,v 1.7.2.1 2005/12/21 22:27:09 tomdz Exp $
*/
public class ExistsCriteria extends SelectionCriteria
{
private boolean m_negative = false;
/**
* Constructor for ExistsCriteria.
* @param subQuery
* @param negative use negative form
*/
ExistsCriteria(Query subQuery, boolean negative)
{
super("", subQuery, (String)null);
m_negative = negative;
}
/*
* @see SelectionCriteria#getClause()
*/
public String getClause()
{
if (m_negative)
{
return " NOT EXISTS";
}
else
{
return " EXISTS";
}
}
}
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