/*
 *    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.spatial;

import org.opengis.filter.FilterVisitor;
import org.opengis.filter.expression.Expression;
import org.opengis.filter.spatial.Within;

import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;

public class WithinImpl extends AbstractPreparedGeometryFilter implements Within {

	public WithinImpl(org.opengis.filter.FilterFactory factory,Expression e1,Expression e2) {
		super(factory,e1,e2);
		
		//backwards compat with old type system
		this.filterType = GEOMETRY_WITHIN;
	}
	
	public WithinImpl(org.opengis.filter.FilterFactory factory,Expression e1,Expression e2, MatchAction matchAction) {
            super(factory,e1,e2,matchAction);
            
            //backwards compat with old type system
            this.filterType = GEOMETRY_WITHIN;
        }
	
	@Override
        public boolean evaluateInternal(Geometry left, Geometry right) {
		
        switch (literals) {
        case BOTH:
            return cacheValue;
        case RIGHT: {
        	// if the right contains left then left is within right
            return rightPreppedGeom.contains(left);
        }
        case LEFT: {
        	// since within does not have an optimization with prepared geometries
        	// there is nothing to be gained in this case so use the normal check
            return basicEvaluate(leftPreppedGeom.getGeometry(), right);
        }
        default: {
            return basicEvaluate(left, right);
        }
        }
	}
	
	public Object accept(FilterVisitor visitor, Object extraData) {
		return visitor.visit(this,extraData);
	}

	@Override
	protected boolean basicEvaluate(Geometry left, Geometry right) {

		Envelope envLeft = left.getEnvelopeInternal();
		Envelope envRight = right.getEnvelopeInternal();
		
		 if(envRight.contains(envLeft))
             return left.within(right);
         else
             return false;
	 }

}