/*
 * 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
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

package org.teiid.language;

import org.teiid.language.visitor.LanguageObjectVisitor;

/**
 * Represents an IS NULL predicate.
 */
public class IsNull extends Condition implements Predicate {
    
    private Expression expression;
    private boolean negated;
    
    public IsNull(Expression expr, boolean isNegated) {
        expression = expr;
        this.negated = isNegated;
    }

    public Expression getExpression() {
        return expression;
    }

    public boolean isNegated() {
        return this.negated;
    }

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

    public void setExpression(Expression expression) {
        this.expression = expression;
    }

    public void setNegated(boolean negated) {
        this.negated = negated;
    }

}
