| gvSIG desktop 1

/*

 *    GeoTools - OpenSource mapping toolkit

 *    http://geotools.org

 *    (C) 2006, GeoTools Project Managment Committee (PMC)

 *        

 *    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.gvsig.data.vectorial.filter;

import org.opengis.filter.FilterVisitor;

import org.opengis.filter.PropertyIsNull;

import org.opengis.filter.expression.Expression;

public class IsNullImpl implements PropertyIsNull{

        private Expression operand;

        public IsNullImpl(Expression expression) {

                operand = expression;

        }

        public boolean evaluate(Object feature) {

                return operand.evaluate(feature)== null;

        }

        public Object accept(FilterVisitor visitor, Object extraData) {

                return visitor.visit( this, extraData );

        }

        public Expression getExpression() {

                return operand;

        }

}