ExistsCriteria.java :  » Database-ORM » db-ojb » org » apache » ojb » broker » query » Java Open Source

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db ojb » org » apache » ojb » broker » query » ExistsCriteria.java
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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