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.dal.store.shp.utils;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileReader;

import java.io.IOException;

import java.nio.ByteOrder;

import java.nio.channels.FileChannel;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.gvsig.fmap.dal.exception.CloseException;

import org.gvsig.fmap.dal.exception.DataException;

import org.gvsig.fmap.dal.exception.FileNotFoundException;

import org.gvsig.fmap.dal.exception.ReadException;

import org.gvsig.fmap.dal.store.shp.SHPStoreParameters;

import org.gvsig.fmap.geom.Geometry;

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

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

import org.gvsig.fmap.geom.GeometryLocator;

import org.gvsig.fmap.geom.GeometryManager;

import org.gvsig.fmap.geom.aggregate.MultiPoint;

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

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

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

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

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

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

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

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

import org.gvsig.fmap.geom.type.GeometryType;

import org.gvsig.fmap.geom.type.GeometryTypeNotSupportedException;

import org.gvsig.fmap.geom.type.GeometryTypeNotValidException;

import org.gvsig.utils.bigfile.BigByteBuffer2;

/**

 * @author jmvivo

 * 

 */

public class SHPFile {

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

    private Envelope extent;

    private int type;

    private int subType;

    private String srsParameters;

    private FileInputStream fin;

    private FileChannel channel;

    private BigByteBuffer2 bb;

    private FileInputStream finShx;

    private FileChannel channelShx;

    private BigByteBuffer2 bbShx;

    private SHPStoreParameters params;

    private int[] supportedGeometryTypes;

    private final GeometryManager gManager = GeometryLocator

        .getGeometryManager();

    private GeometryType gtypeNull;

    private PointGeometryType gtypePoint2D;

    private GeometryType gtypeCurve2D;

    private GeometryType gtypeSurface2D;

    private GeometryType gtypeMultiPoint2D;

    public SHPFile(SHPStoreParameters params) {

        this.params = params;

        try {

            gtypeNull = gManager.getGeometryType(TYPES.NULL, SUBTYPES.GEOM2D);

            gtypePoint2D =

                (PointGeometryType) gManager.getGeometryType(TYPES.POINT,

                    SUBTYPES.GEOM2D);

            gtypeCurve2D =

                gManager.getGeometryType(TYPES.CURVE, SUBTYPES.GEOM2D);

            gtypeSurface2D =

                gManager.getGeometryType(TYPES.SURFACE, SUBTYPES.GEOM2D);

            gtypeMultiPoint2D =

                gManager.getGeometryType(TYPES.MULTIPOINT, SUBTYPES.GEOM2D);

        } catch (GeometryTypeNotSupportedException e) {

            throw new RuntimeException(

                "Unable to get the 2D geometry types to use", e);

        } catch (GeometryTypeNotValidException e) {

            throw new RuntimeException(

                "Unable to get the 2D geometry types to use", e);

        }

    }

    /*

     * (non-Javadoc)

     * 

     * @see org.gvsig.fmap.dal.Resource#doClose()

     */

    public void close() throws CloseException {

        CloseException ret = null;

        // FIXME: Arreglar esto para que se acumulen los errores

        try {

            channel.close();

            channelShx.close();

        } catch (IOException e) {

            ret = new CloseException("SHPFile.close", e);

        } finally {

            try {

                fin.close();

                finShx.close();

            } catch (IOException e1) {

                ret = new CloseException("SHPFile.close", e1);

            }

        }

        if (ret != null) {

            throw ret;

        }

        bb = null;

        bbShx = null;

        fin = null;

        finShx = null;

        channel = null;

        channelShx = null;

        srsParameters = null;

    }

    public boolean isOpen() {

        return this.fin != null;

    }

    public synchronized void open() throws DataException {

        try {

            fin = new FileInputStream(this.params.getSHPFile());

        } catch (java.io.FileNotFoundException e) {

            throw new FileNotFoundException(this.params.getSHPFileName());

        }

        // Open the file and then get a channel from the stream

        channel = fin.getChannel();

        // long size = channel.size();

        // Get the file's size and then map it into memory

        // bb = channel.map(FileChannel.MapMode.READ_ONLY, 0, size);

        try {

            bb = new BigByteBuffer2(channel, FileChannel.MapMode.READ_ONLY);

        } catch (IOException e) {

            throw new ReadException(this.params.getSHPFileName(), e);

        }

        try {

            finShx = new FileInputStream(this.params.getSHXFile());

        } catch (java.io.FileNotFoundException e) {

            throw new FileNotFoundException(this.params.getSHXFileName());

        }

        // Open the file and then get a channel from the stream

        channelShx = finShx.getChannel();

        // long sizeShx = channelShx.size();

        // Get the file's size and then map it into memory

        // bb = channel.map(FileChannel.MapMode.READ_ONLY, 0, size);

        // bbShx = channelShx.map(FileChannel.MapMode.READ_ONLY, 0, sizeShx);

        try {

            bbShx =

                new BigByteBuffer2(channelShx, FileChannel.MapMode.READ_ONLY);

        } catch (IOException e) {

            throw new ReadException(this.params.getSHXFileName(), e);

        }

        bbShx.order(ByteOrder.BIG_ENDIAN);

        // create a new header.

        ShapeFileHeader2 myHeader = new ShapeFileHeader2();

        bb.position(0);

        // read the header

        myHeader.readHeader(bb);

        double[] min = new double[2];

        min[0] = myHeader.myXmin;

        min[1] = myHeader.myYmin;

        double[] max = new double[2];

        max[0] = myHeader.myXmax;

        max[1] = myHeader.myYmax;

        try {

            extent =

                gManager.createEnvelope(min[0], min[1], max[0], max[1],

                    SUBTYPES.GEOM2D);

        } catch (CreateEnvelopeException e1) {

            logger.error("Error creating the envelope", e1);

        }

        // extent = new Rectangle2D.Double(myHeader.myXmin, myHeader.myYmin,

        // myHeader.myXmax - myHeader.myXmin,

        // myHeader.myYmax - myHeader.myYmin);

        type = myHeader.myShapeType;

        subType = getGeometrySubType();

        this.initSupportedGeometryTypes();

        double x = myHeader.myXmin;

        double y = myHeader.myYmin;

        double w = myHeader.myXmax - myHeader.myXmin;

        double h = myHeader.myYmax - myHeader.myYmin;

        if (w == 0) {

            x -= 0.1;

            w = 0.2;

        }

        if (h == 0) {

            y -= 0.1;

            h = 0.2;

        }

        // TODO: SRS

        File prjFile = SHP.getPrjFile(this.params.getSHPFile());

        if (prjFile.exists()) {

            BufferedReader input = null;

            try {

                input = new BufferedReader(new FileReader(prjFile));

            } catch (java.io.FileNotFoundException e) {

                throw new FileNotFoundException(prjFile.getAbsolutePath());

            }

            try {

                this.srsParameters = input.readLine();

            } catch (IOException e) {

                throw new ReadException("SHPFile.open prj", e);

            } finally {

                try {

                    input.close();

                } catch (IOException e) {

                    // TODO ???

                }

            }

        } else {

            this.srsParameters = null;

        }

    }

    public Envelope getFullExtent() throws ReadException {

        return this.extent;

    }

    public boolean isEditable() {

        return this.params.getDBFFile().canWrite()

            && this.params.getSHPFile().canWrite()

            && this.params.getSHXFile().canWrite();

    }

    public int getGeometryType() throws ReadException {

        int auxType = 0;

        switch (type) {

        case (SHP.POINT2D):

        case (SHP.POINT3D):

            auxType = auxType | Geometry.TYPES.POINT;

            break;

        case (SHP.POLYLINE2D):

        case (SHP.POLYLINE3D):

            auxType = auxType | Geometry.TYPES.MULTICURVE;

            break;

        case (SHP.POLYGON2D):

        case (SHP.POLYGON3D):

            auxType = auxType | Geometry.TYPES.MULTISURFACE;

            break;

        case (SHP.MULTIPOINT2D):

        case (SHP.MULTIPOINT3D):

            auxType = auxType | Geometry.TYPES.MULTIPOINT;

            break;

        }

        return auxType;

    }

    public int getGeometrySubType() throws ReadException {

        switch (type) {

        case (SHP.POINT2D):

        case (SHP.POLYLINE2D):

        case (SHP.POLYGON2D):

        case (SHP.MULTIPOINT2D):

            return SUBTYPES.GEOM2D;

        case (SHP.POINT3D):

        case (SHP.POLYLINE3D):

        case (SHP.POLYGON3D):

        case (SHP.MULTIPOINT3D):

            return SUBTYPES.GEOM3D;

        case (SHP.POINTM):

        case (SHP.POLYLINEM):

        case (SHP.POLYGONM):

        case (SHP.MULTIPOINTM):

            return SUBTYPES.GEOM2DM;

        }

        return SUBTYPES.UNKNOWN;

    }

    /**

     * Gets the geometry with the index provided.

     * Set to synchronized to prevent concurrent threads issue (?)

     * 

     * @param position

     * @return

     * @throws ReadException

     * @throws CreateGeometryException

     */

    public synchronized Geometry getGeometry(long position)

        throws ReadException, CreateGeometryException {

        int shapeType;

        bb.position(getPositionForRecord(position));

        bb.order(ByteOrder.LITTLE_ENDIAN);

        shapeType = bb.getInt();

        // el shape tal con tema tal y n?mro tal es null

        if (shapeType == SHP.NULL) {

            return gtypeNull.create();

        }

        /*

         * Inconsistency: this particular shape is not

         * of the expected type. This can be because the SHP file

         * is corrupt and it can cause "out of memory error"

         * because the code will possibly try to instantiate a

         * huge (absurd) array, so it's safer to return a null geometry

         */

        if (shapeType != type) {

            return gtypeNull.create();

        }

        // retrieve that shape.

        // tempRecord.setShape(readShape(tempShapeType, tempContentLength, in));

        switch (type) {

        case (SHP.POINT2D):

        case (SHP.POINT3D):

        case (SHP.POINTM):

            Point point = readPoint(bb);

            fillPoint(point);

            return point;

        case (SHP.POLYLINE2D):

            Curve curve = (Curve) gtypeCurve2D.create();

            fillCurve(curve);

            return curve;

        case (SHP.POLYGON2D):

            Surface surface = (Surface) gtypeSurface2D.create();

            fillSurface(surface);

            return surface;

        case (SHP.POLYLINE3D):

            Curve curve3D =

                (Curve) gManager.create(TYPES.CURVE, SUBTYPES.GEOM3D);

            fillCurve(curve3D);

            fillZ(curve3D);

            return curve3D;

        case (SHP.POLYGON3D):

            Surface surface3D =

                (Surface) gManager.create(TYPES.SURFACE, SUBTYPES.GEOM3D);

            fillSurface(surface3D);

            fillZ(surface3D);

            return surface3D;

        case (SHP.MULTIPOINT2D):

            Point p = null;

            int numPoints;

            int i;

            int j;

            bb.position(bb.position() + 32);

            numPoints = bb.getInt();

            Point[] points = new Point[numPoints];

            for (i = 0; i < numPoints; i++) {

                points[i] =

                    (Point) gManager.create(TYPES.POINT, SUBTYPES.GEOM2D);

                points[i].setX(bb.getDouble());

                points[i].setY(bb.getDouble());

            }

            MultiPoint multipoint = (MultiPoint) gtypeMultiPoint2D.create();

            // MultiPoint multipoint =

            // (MultiPoint)GeometryLocator.getGeometryManager().create(TYPES.MULTIPOINT,

            // SUBTYPES.GEOM2D);

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

                multipoint.addPoint(points[k]);

            }

            return multipoint;

        case (SHP.MULTIPOINT3D):

            bb.position(bb.position() + 32);

            numPoints = bb.getInt();

            double[] temX = new double[numPoints];

            double[] temY = new double[numPoints];

            double[] temZ = new double[numPoints];

            for (i = 0; i < numPoints; i++) {

                temX[i] = bb.getDouble();

                temY[i] = bb.getDouble();

                // temZ[i] = bb.getDouble();

            }

            for (i = 0; i < numPoints; i++) {

                temZ[i] = bb.getDouble();

            }

            MultiPoint multipoint3D =

                (MultiPoint) gManager.create(TYPES.MULTIPOINT, SUBTYPES.GEOM3D);

            for (int k = 0; k < temX.length; k++) {

                Point pointAux =

                    (Point) gManager.create(TYPES.POINT, SUBTYPES.GEOM3D);

                pointAux.setX(temX[k]);

                pointAux.setY(temY[k]);

                pointAux.setCoordinateAt(2, temZ[k]);

                multipoint3D.addPoint(pointAux);

            }

            return multipoint3D;

        }

        return null;

    }

    private void fillPoint(Point point) throws ReadException {

        if (subType == Geometry.SUBTYPES.GEOM3D) {

            point.setCoordinateAt(Geometry.DIMENSIONS.Z, bb.getDouble());

        } else

            if (subType == Geometry.SUBTYPES.GEOM2DM) {

                point.setCoordinateAt(2, bb.getDouble());

            }

    }

    private void fillCurve(Curve curve)

        throws CreateGeometryException, ReadException {

        Point p = null;

        int numParts;

        int numPoints;

        int i;

        int j;

        bb.position(bb.position() + 32);

        numParts = bb.getInt();

        numPoints = bb.getInt();

        int[] tempParts = new int[numParts];

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

            tempParts[i] = bb.getInt();

        }

        j = 0;

        for (i = 0; i < numPoints; i++) {

            p = readPoint(bb);

            if (i == tempParts[j]) {

                curve.addMoveToVertex(p);

                if (j < (numParts - 1)) {

                    j++;

                }

            } else {

                curve.addVertex(p);

            }

        }

    }

    private void fillSurface(Surface surface)

        throws CreateGeometryException, ReadException {

        Point p = null;

        int numParts;

        int numPoints;

        int i;

        int partIndex;

        bb.position(bb.position() + 32);

        numParts = bb.getInt();

        numPoints = bb.getInt();

        int[] tempParts = new int[numParts];

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

            tempParts[i] = bb.getInt();

        }

        partIndex = 0;

        for (i = 0; i < numPoints; i++) {

            p = readPoint(bb);

            if (i == tempParts[partIndex]) {

                surface.addMoveToVertex(p);

                if (partIndex < (numParts - 1)) {

                    partIndex++;

                }

            } else {

                if ((i == tempParts[partIndex] - 1) || (i == numPoints - 1)) {

                    surface.closePrimitive();

                } else {

                    surface.addVertex(p);

                }

            }

        }

    }

    private void fillZ(OrientablePrimitive orientablePrimitive)

        throws CreateGeometryException, ReadException {

        double[] boxZ = new double[2];

        boxZ[0] = bb.getDouble();

        boxZ[1] = bb.getDouble();

        for (int i = 0; i < orientablePrimitive.getNumVertices(); i++) {

            orientablePrimitive.setCoordinateAt(i, 2, bb.getDouble());

        }

    }

    private long getPositionForRecord(long numRec) {

        // shx file has a 100 bytes header, then, records

        // 8 bytes length, one for each entity.

        // first 4 bytes are the offset

        // next 4 bytes are length

        int posIndex = 100 + ((int) numRec * 8);

        // bbShx.position(posIndex);

        long pos = 8 + 2 * bbShx.getInt(posIndex);

        return pos;

    }

    /**

     * Reads the Point from the shape file.

     * 

     * @param in

     *            ByteBuffer.

     * 

     * @return Point2D.

     * @throws ReadException

     * @throws CreateGeometryException

     */

    private Point readPoint(BigByteBuffer2 in)

        throws CreateGeometryException, ReadException {

        // bytes 1 to 4 are the type and have already been read.

        // bytes 4 to 12 are the X coordinate

        in.order(ByteOrder.LITTLE_ENDIAN);

        return Geometry.SUBTYPES.GEOM2D == subType ? gtypePoint2D.createPoint(

            in.getDouble(), in.getDouble()) : gManager.createPoint(

            in.getDouble(),

            in.getDouble(), subType);

    }

    /**

     * Lee un rect?ngulo del fichero.

     * 

     * @param in

     *            ByteBuffer.

     * 

     * @return Rect?ngulo.

     * @throws CreateEnvelopeException

     * 

     * @throws IOException

     */

    private Envelope readRectangle(BigByteBuffer2 in)

        throws CreateEnvelopeException {

        in.order(ByteOrder.LITTLE_ENDIAN);

        double x = in.getDouble();

        double y = in.getDouble();

        double x2 = in.getDouble();

        if (x2 - x == 0) {

            x2 += 0.2;

            x -= 0.1;

        }

        double y2 = in.getDouble();

        if (y2 - y == 0) {

            y2 += 0.2;

            y -= 0.1;

        }

        Envelope tempEnvelope =

            gManager.createEnvelope(x, y, x2, y2, SUBTYPES.GEOM2D);

        return tempEnvelope;

    }

    /**

     * Gets the geometry bbox with the index provided.

     * Set to synchronized to prevent concurrent threads issue (?)

     * 

     * @param featureIndex

     * @return

     * @throws ReadException

     * @throws CreateEnvelopeException

     * @throws CreateGeometryException

     */

    public synchronized Envelope getBoundingBox(long featureIndex)

        throws ReadException, CreateEnvelopeException, CreateGeometryException {

        Point p = null;

        Envelope BoundingBox = null;

        try {

            bb.position(getPositionForRecord(featureIndex));

        } catch (Exception e) {

            throw new ReadException("getBondingBox (" + featureIndex + ")", e);

            // logger.error(" Shapefile is corrupted. Drawing aborted. ="+e+

            // "  "+"index = "+index);

        }

        bb.order(ByteOrder.LITTLE_ENDIAN);

        int tipoShape = bb.getInt();

        // AZABALA: si tipoShape viene con valores erroneos deja de funcionar

        // el metodo getShape(i)

        // if (tipoShape != SHP.NULL) {

        // type = tipoShape;

        // }

        // retrieve that shape.

        // tempRecord.setShape(readShape(tempShapeType, tempContentLength, in));

        switch (tipoShape) {

        case (SHP.POINT2D):

        case (SHP.POINT3D):

            p = readPoint(bb);

            BoundingBox =

                gManager.createEnvelope(p.getX() - 0.1, p.getY() - 0.1,

                    p.getX() + 0.2, p.getY() + 0.2, SUBTYPES.GEOM2D);

            // new Rectangle2D.Double(p.getX() - 0.1,

            // p.getY() - 0.1, 0.2, 0.2);

            break;

        case (SHP.POLYLINE2D):

        case (SHP.POLYGON2D):

        case (SHP.MULTIPOINT2D):

        case (SHP.POLYLINE3D):

        case (SHP.POLYGON3D):

        case (SHP.MULTIPOINT3D):

            // BoundingBox

            BoundingBox = readRectangle(bb);

            break;

        }

        return BoundingBox;

    }

    /**

     * @return

     */

    public String getSRSParameters() {

        return this.srsParameters;

    }

    private void initSupportedGeometryTypes() throws ReadException {

        switch (this.getGeometryType()) {

        case Geometry.TYPES.POINT:

            supportedGeometryTypes =

                new int[] { Geometry.TYPES.POINT, Geometry.TYPES.NULL };

            break;

        case Geometry.TYPES.MULTIPOINT:

            supportedGeometryTypes =

                new int[] { Geometry.TYPES.MULTIPOINT, Geometry.TYPES.NULL };

            break;

        case Geometry.TYPES.MULTICURVE:

            supportedGeometryTypes =

                new int[] { Geometry.TYPES.CURVE, Geometry.TYPES.ELLIPSE,

                    Geometry.TYPES.ARC, Geometry.TYPES.CIRCLE,

                    Geometry.TYPES.SURFACE, Geometry.TYPES.NULL,

                    Geometry.TYPES.MULTICURVE };

            break;

        case Geometry.TYPES.MULTISURFACE:

            supportedGeometryTypes =

                new int[] { Geometry.TYPES.ELLIPSE, Geometry.TYPES.CIRCLE,

                    Geometry.TYPES.SURFACE, Geometry.TYPES.NULL,

                    Geometry.TYPES.MULTISURFACE };

            break;

        default:

            supportedGeometryTypes = new int[] {};

        }

    }

    public boolean canWriteGeometry(int gvSIGgeometryType) {

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

            if (gvSIGgeometryType == supportedGeometryTypes[i]) {

                return true;

            }

        }

        return false;

    }

}