Application: gvSIG desktop

/**

 * gvSIG. Desktop Geographic Information System.

 *

 * Copyright (C) 2007-2013 gvSIG Association.

 *

 * 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 3 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.

 *

 * For any additional information, do not hesitate to contact us at info AT

 * gvsig.com, or visit our website www.gvsig.com.

 */

package org.gvsig.fmap.mapcontext.layers.vectorial;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import org.gvsig.expressionevaluator.ExpressionBuilder;

import org.gvsig.expressionevaluator.GeometryExpressionBuilder;

import org.gvsig.fmap.dal.feature.Feature;

import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor;

import org.gvsig.fmap.dal.feature.FeatureType;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.tools.evaluator.AbstractEvaluator;

import org.gvsig.tools.evaluator.EvaluatorData;

import org.gvsig.tools.evaluator.EvaluatorException;

public class IntersectsGeometryEvaluator extends AbstractEvaluator {

    private final String geomName;

    private final Geometry geometry;

    private final Geometry geometryTrans;

    private final boolean isDefault;

    private final GeometryExpressionBuilder builder;

    private final IProjection projection;

    private final FeatureAttributeDescriptor fad;

    IntersectsGeometryEvaluator(

            Geometry geometry,

            IProjection projection,

            FeatureType featureType,

            String geomName,

            GeometryExpressionBuilder builder

        ) {

        fad = (FeatureAttributeDescriptor) featureType

                .get(geomName);

        this.isDefault = featureType.getDefaultGeometryAttributeName().equals(geomName);

        this.geometry = geometry;

        this.projection = projection;

        this.builder = builder;

        this.geometryTrans = geometry.cloneGeometry();

        ICoordTrans ct = null;

        IProjection ipro = fad.getSRS();

        if (ipro != null && !ipro.equals(projection)) {

            ct = projection.getCT(ipro);

        }

        if (ct != null) {

            geometryTrans.reProject(ct);

        }

        this.geomName = geomName;

        this.getFieldsInfo().addMatchFieldValue(geomName, geometryTrans);

    }

    @Override

    public Object evaluate(EvaluatorData data) throws EvaluatorException {

        try {

            Geometry geom;

            if (isDefault) {

                Feature feature = (Feature) data.getContextValue("feature");

                geom = feature.getDefaultGeometry();

            } else {

                geom = (Geometry) data.getDataValue(geomName);

            }

            if (geom == null) {

                return Boolean.FALSE;

            }

            return geometryTrans.intersects(geom);

        } catch (Exception e) {

            return Boolean.FALSE;

        }

    }

    @Override

    public String getName() {

        return "intersects with geometry";

    }

    @Override

    public String getSQL() {

        ExpressionBuilder.Variable column = builder.column(fad.getName());

        return builder.set(

                builder.and(

                    builder.not_is_null(column),

                    builder.ST_Intersects(

                            column,

                            builder.geometry(geometry, this.projection)

                    )

                )

        ).toString();

    }

}