Exists.java

/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library 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 library 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 library; if not, write to the Free Software
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 */

package org.teiid.language;

import org.teiid.language.visitor.LanguageObjectVisitor;

/**
 * Represents an EXISTS criteria that checks whether any results would be 
 * returned from a subquery.  
 */
public class Exists extends Condition implements Predicate, SubqueryContainer {

    private QueryExpression query;
    
    public Exists(QueryExpression query) {
        this.query = query;
    }

    public QueryExpression getSubquery() {
        return query;
    }

    public void acceptVisitor(LanguageObjectVisitor visitor) {
        visitor.visit(this);
    }

    public void setSubquery(QueryExpression query) {
        this.query = query;
    }

}