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.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.fmap.geom.primitive.Envelope;

import org.gvsig.tools.evaluator.AbstractEvaluator;

import org.gvsig.tools.evaluator.EvaluatorData;

import org.gvsig.tools.evaluator.EvaluatorException;

public class IntersectsEnvelopeEvaluator extends AbstractEvaluator {

    private final Envelope envelope;

    private final String geomName;

    private final boolean isDefault;

    private final String defaultGeometryAttributeName;

    private final IProjection projection;

    private final GeometryExpressionBuilder builder;

    FeatureAttributeDescriptor fad;

    IntersectsEnvelopeEvaluator(

            Envelope envelope,

            IProjection envelopeProjection, 

            FeatureType featureType,

            String geomName,

            GeometryExpressionBuilder builder

        ) {

        fad = (FeatureAttributeDescriptor) featureType.get(geomName);

        defaultGeometryAttributeName = featureType.getDefaultGeometryAttributeName();

        this.isDefault = defaultGeometryAttributeName.equals(geomName);

        this.envelope = envelope;

        this.projection = envelopeProjection;

        this.builder = builder;

        this.geomName = geomName;

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

    }

    @Override

    public Object evaluate(EvaluatorData data) throws EvaluatorException {

        Envelope featureEnvelope;

        Geometry geom ;

        if (isDefault) {

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

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

        } else {

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

            if (geom == null) {

                return false;

            }

            featureEnvelope = geom.getEnvelope();

        }

        if (envelope.intersects(featureEnvelope)) {

            return envelope.intersects(geom);

        }

        return false;

    }

    @Override

    public String getName() {

        return "intersects envelope";

    }

    @Override

    public String getSQL() {

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

        IProjection theProjection = this.projection;

        if( this.fad.getSRS()==null ) {

            theProjection = null;

        }

        return builder.set(

                builder.and(

                    builder.not_is_null(column)    ,

                    builder.ST_Intersects(

                            column,

                            builder.geometry(envelope.getGeometry(), theProjection)

                    )

                )

        ).toString();

    }

}