/*
 * SQLElements object-oriented SQL parsing and generation library
 * 
 * Copyright (c) 2003, 2004, 2005 Israfil Consulting Services Corporation
 * Copyright (c) 2003, 2004, 2005 Christian Edward Gruber
 * All Rights Reserved
 * 
 *  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 SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 *
 *  You should have received a copy of the GNU Lesser General Public License 
 *  along with this library; if not, please visit http://www.gnu.org/licenses/lgpl.html
 *
 * $Id: BinaryConstraint.java 16 2005-12-09 04:03:58Z cgruber $
 */
package org.israfil.sqlelements.constraints;

import org.israfil.sqlelements.render.SQLRenderContext;

/**
 * A friendly parent for binary column constraints.
 * 
 * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
 * @author Latest: $Author: cgruber $
 * @version $Revision: 16 $
 */
public abstract class BinaryConstraint implements ComplexConstraint
{
    protected Constraint leftOperand;
    protected Constraint rightOperand;
    protected String operatorText;
    
    protected BinaryConstraint(Constraint leftOperand,Constraint rightOperand, String operatorText) 
    {
        this.leftOperand = leftOperand;
        this.rightOperand = rightOperand;
        this.operatorText = operatorText;
    }
    public String render(SQLRenderContext context) 
    {
        String sql = ConstraintUtils.renderInParentheses(leftOperand,context);
        sql += " ";
        sql += operatorText;
        sql += " ";
        sql += ConstraintUtils.renderInParentheses(rightOperand,context);
        return sql;
    }    
}