/*
 * 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: ColumnConstraint.java 21 2005-12-10 21:40:45Z cgruber $
 */
package org.israfil.sqlelements.constraints;

import org.israfil.sqlelements.Column;
import org.israfil.sqlelements.render.SQLRenderContext;


/**
 * A constraint wrapper for a column.  It's used internally by 
 * the library to ease implementation of column-oriented
 * constraints such as "Equals", etc.
 * 
 * @see BinaryConstraint
 * @see Equals
 * 
 * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
 * @author Latest: $Author: cgruber $
 * @version $Revision: 21 $
 */
class ColumnConstraint implements SimpleConstraint
{
    Column column;
    public Column getColumn() { return column; } 

    public ColumnConstraint(Column column) 
    {
        this.column = column;
    }
    
    public String render(SQLRenderContext context)
    {
        if (column.getTable() != null) 
        {
            return context.getAlias(column.getTable()) + "." + column.render(context);
        }
        else return column.render(context);
    }
}