Application: gvSIG desktop

/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana

 *

 * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.

 *

 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,USA.

 *

 * For more information, contact:

 *

 *  Generalitat Valenciana

 *   Conselleria d'Infraestructures i Transport

 *   Av. Blasco Ib??ez, 50

 *   46010 VALENCIA

 *   SPAIN

 *

 *      +34 963862235

 *   gvsig@gva.es

 *      www.gvsig.gva.es

 *

 *    or

 *

 *   IVER T.I. S.A

 *   Salamanca 50

 *   46005 Valencia

 *   Spain

 *

 *   +34 963163400

 *   dac@iver.es

 */

package org.gvsig.fmap.dal.store.shp.utils;

import java.awt.geom.Rectangle2D;

import java.nio.ByteBuffer;

import java.nio.MappedByteBuffer;

import org.gvsig.fmap.geom.Geometry;

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.Geometry.SUBTYPES;

import org.gvsig.fmap.geom.exception.CreateGeometryException;

import org.gvsig.fmap.geom.primitive.Envelope;

import org.gvsig.fmap.geom.primitive.Point;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

/**

 * Elemento shape de tipo Pol?gono.

 *

 * @author Vicente Caballero Navarro

 */

public class SHPPolygon extends SHPMultiLine {

        private static final GeometryManager geomManager = GeometryLocator.getGeometryManager();

        private static final Logger logger = LoggerFactory.getLogger(SHPPolygon.class);

        /**

         * Crea un nuevo SHPPolygon.

         */

        public SHPPolygon() {

                m_type = SHP.POLYGON2D;

        }

        /**

         * Crea un nuevo SHPPolygon.

         *

         * @param type Tipo de shape.

         *

         * @throws ShapefileException

         */

        public SHPPolygon(int type) {

                if ((type != SHP.POLYGON2D) &&

                                (type != SHP.POLYGONM) &&

                                (type != SHP.POLYGON3D)) {

//                        throw new ShapefileException("No es de tipo 5, 15, o 25");

                }

                m_type = type;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.shp.SHPShape#getShapeType()

         */

        public int getShapeType() {

                return m_type;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.shp.SHPShape#read(MappedByteBuffer, int)

         */

        public synchronized Geometry read(MappedByteBuffer buffer, int type) {

                double minX = buffer.getDouble();

                double minY = buffer.getDouble();

                double maxX = buffer.getDouble();

                double maxY = buffer.getDouble();

                Rectangle2D rec = new Rectangle2D.Double(minX, minY, maxX - minX,

                                maxY - maxY);

                int numParts = buffer.getInt();

                int numPoints = buffer.getInt();

                int[] partOffsets = new int[numParts];

                for (int i = 0; i < numParts; i++) {

                        partOffsets[i] = buffer.getInt();

                }

                Point[] points = readPoints(buffer, numPoints);

                /* if (m_type == FConstant.SHAPE_TYPE_POLYGONZ) {

                   //z

                   buffer.position(buffer.position() + (2 * 8));

                   for (int t = 0; t < numPoints; t++) {

                       points[t].z = buffer.getDouble();

                   }

                   }

                 */

                int offset = 0;

                int start;

                int finish;

                int length;

                for (int part = 0; part < numParts; part++) {

                        start = partOffsets[part];

                        if (part == (numParts - 1)) {

                                finish = numPoints;

                        } else {

                                finish = partOffsets[part + 1];

                        }

                        length = finish - start;

                        Point[] pointsPart = new Point[length];

                        for (int i = 0; i < length; i++) {

                                pointsPart[i] = points[offset++];

                        }

                }

                try {

                        return geomManager.createSurface(getGeneralPathX(points, partOffsets), SUBTYPES.GEOM2D);

                } catch (CreateGeometryException e) {

                        logger.error("Error creating a surface", e);

                        return null;

                }

        }

        /**

         * Lee los puntos del buffer.

         *

         * @param buffer

         * @param numPoints N?mero de puntos.

         *

         * @return Vector de Puntos.

         */

        private synchronized Point[] readPoints(final MappedByteBuffer buffer,

                final int numPoints) {

                Point[] points = new Point[numPoints];

                for (int t = 0; t < numPoints; t++) {

                        try {

                                points[t] = geomManager.createPoint(buffer.getDouble(), buffer.getDouble(), SUBTYPES.GEOM2D);

                        } catch (CreateGeometryException e) {

                                logger.error("Error creating a point", e);

                        }

                }

                return points;

        }

        /**

         * @see com.iver.cit.gvsig.fmap.shp.SHPShape#write(ByteBuffer, IGeometry)

         */

        public synchronized void write(ByteBuffer buffer, Geometry geometry) {

                Envelope env = geometry.getEnvelope();

                buffer.putDouble(env.getMinimum(0));

                buffer.putDouble(env.getMinimum(1));

                buffer.putDouble(env.getMaximum(0));

                buffer.putDouble(env.getMaximum(1));

                int nparts = parts.length;

                int npoints = points.length;

                buffer.putInt(nparts);

                buffer.putInt(npoints);

                for (int t = 0; t < nparts; t++) {

                        buffer.putInt(parts[t]);

                }

                for (int t = 0; t < points.length; t++) {

                        buffer.putDouble(points[t].getX());

                        buffer.putDouble(points[t].getY());

                }

                if (m_type == SHP.POLYGON3D) {

                        double[] zExtreame = SHP.getZMinMax(zs);

                        if (Double.isNaN(zExtreame[0])) {

                                buffer.putDouble(0.0);

                                buffer.putDouble(0.0);

                        } else {

                                buffer.putDouble(zExtreame[0]);

                                buffer.putDouble(zExtreame[1]);

                        }

                        for (int t = 0; t < npoints; t++) {

                                double z = zs[t];

                                if (Double.isNaN(z)) {

                                        buffer.putDouble(0.0);

                                } else {

                                        buffer.putDouble(z);

                                }

                        }

                }

                if ((m_type == SHP.POLYGONM)) {

                        buffer.putDouble(-10E40);

                        buffer.putDouble(-10E40);

                        for (int t = 0; t < npoints; t++) {

                                buffer.putDouble(-10E40);

                        }

                }

        }

        /**

         * @see com.iver.cit.gvsig.fmap.shp.SHPShape#getLength(com.iver.cit.gvsig.core.BasicShape.FGeometry)

         */

        public synchronized int getLength(Geometry fgeometry) {

                int npoints = points.length;

                int length;

                if (m_type == SHP.POLYGON3D || m_type == SHP.POLYGONM) {

                        length = 44 + (4 * parts.length) + (16 * npoints) + (8 * npoints) + 16;

                } else if (m_type == SHP.POLYGON2D) {

                        length = 44 + (4 * parts.length) + (16 * npoints);

                } else {

                        throw new IllegalStateException("Expected ShapeType of Polygon, got " + m_type);

                }

                return length;

        }

}