Application: gvSIG desktop

/* gvSIG. Geographic Information System of the Valencian Government

*

* Copyright (C) 2007-2008 Infrastructures and Transports Department

* of the Valencian Government (CIT)

* 

* This program is free software; you can redistribute it and/or

* modify it under the terms of the GNU General Public License

* as published by the Free Software Foundation; either version 2

* of the License, or (at your option) any later version.

* 

* This program 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 General Public License for more details.

* 

* You should have received a copy of the GNU General Public License

* along with this program; if not, write to the Free Software

* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 

* MA  02110-1301, USA.

* 

*/

/*

* AUTHORS (In addition to CIT):

* 2008 IVER T.I. S.A.   {{Task}}

*/

package org.gvsig.data.vectorial.expressionevaluator.functions;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.operation.GeometryOperationException;

import org.gvsig.fmap.geom.operation.GeometryOperationNotSupportedException;

import org.gvsig.fmap.geom.operation.relationship.DefaultRelationshipGeometryOperationContext;

import org.medfoster.sqljep.ASTFunNode;

import org.medfoster.sqljep.JepRuntime;

import org.medfoster.sqljep.ParseException;

import org.medfoster.sqljep.function.PostfixCommand;

public class Intersects extends PostfixCommand {

        public static final String NAME = "intersects";

        final public int getNumberOfParameters() {

                return 2;

        }

        /* (non-Javadoc)

         * @see org.medfoster.sqljep.function.PostfixCommand#evaluate(org.medfoster.sqljep.ASTFunNode, org.medfoster.sqljep.JepRuntime)

         */

        public void evaluate(ASTFunNode node, JepRuntime runtime)

                        throws ParseException {

                node.childrenAccept(runtime.ev, null);

                Geometry geom1 = (Geometry)runtime.stack.pop();

                Geometry geom2 = (Geometry)runtime.stack.pop();

                runtime.stack.push(overlaps(geom1, geom2));

        }

        private static Boolean overlaps(Geometry geom1, Geometry geom2) throws ParseException {

                try {

                        return (Boolean) geom1.invokeOperation(

                                        org.gvsig.fmap.geom.operation.relationship.Intersects.CODE,

                                        new DefaultRelationshipGeometryOperationContext(geom2));

                } catch (GeometryOperationNotSupportedException e) {

                        throw new ParseException(NAME, e);

                } catch (GeometryOperationException e) {

                        throw new ParseException(NAME, e);

                }

        }

}