/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 * 
 *    (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)
 *        
 *    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;
 *    version 2.1 of the License.
 *
 *    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.
 */
package org.geotools.filter;

import org.opengis.filter.FilterVisitor;
import org.opengis.filter.PropertyIsLessThan;
import org.opengis.filter.expression.Expression;
/**
 * @author jdeolive
 *
 *
 * @source $URL$
 */
public class IsLessThenImpl extends MultiCompareFilterImpl implements
		PropertyIsLessThan {

	protected IsLessThenImpl(org.opengis.filter.FilterFactory factory) {
		this(factory, null,null);
	}
	
        protected IsLessThenImpl(org.opengis.filter.FilterFactory factory, Expression expression1, Expression expression2) {
            this(factory, expression1, expression2,false);
    }
     
    protected IsLessThenImpl(org.opengis.filter.FilterFactory factory, Expression expression1, Expression expression2,boolean matchCase) {
            super(factory, expression1, expression2,matchCase);
            
            //backwards compat with old type system
            this.filterType = COMPARE_LESS_THAN;
    }
    
    protected IsLessThenImpl(org.opengis.filter.FilterFactory factory, Expression expression1, Expression expression2, MatchAction matchAction) {
        this(factory, expression1, expression2,false, matchAction);
    }
     
    protected IsLessThenImpl(org.opengis.filter.FilterFactory factory, Expression expression1, Expression expression2,boolean matchCase, MatchAction matchAction) {
            super(factory, expression1, expression2,matchCase, matchAction);
            
            //backwards compat with old type system
            this.filterType = COMPARE_LESS_THAN;
    }
	
	@Override
	public boolean evaluateInternal(Object v1, Object v2) {
		Object[] values = eval( v1, v2 );
		Comparable value1 = comparable( values[ 0 ] );
		Comparable value2 = comparable( values[ 1 ] );
		
		return value1 != null && value2 != null && compare(value1,value2) < 0;
	}

	public Object accept(FilterVisitor visitor, Object extraData) {
		return visitor.visit(this,extraData);
	}
}