Application: gvSIG desktop

package org.cresques.io;

/*

 *    GISToolkit - Geographical Information System Toolkit

 *    (C) 2002, Ithaqua Enterprises Inc.

 *

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

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

 *    License as published by the Free Software Foundation;

 *    version 2.1 of the License.

 *

 *    This library 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

 *    Lesser General Public License for more details.

 *

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

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

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

 *

 */

import java.nio.*;

/**

 * Procesa la cabecera de un .shp

 * @author "Luis W. Sevilla" <sevilla_lui@gva.es>* @author administrador

 */

public class ShpFileHeader {

    //}

    /**

     * Class to represent the header in the shape file.

     */

    //public class ShapeFileHeader {

    /**

     * Shape Type

     * Value Shape Type

     * 0 Null Shape

     * 1 Point

     * 3 PolyLine

     * 5 Polygon

     * 8 MultiPoint

     * 11 PointZ

     * 13 PolyLineZ

     * 15 PolygonZ

     * 18 MultiPointZ

     * 21 PointM

     * 23 PolyLineM

     * 25 PolygonM

     * 28 MultiPointM

     * 31 MultiPatch

     */

    /* The null shape type, there is no shape for this record. */

    public static final int SHAPE_NULL = 0;

    public static final int SHAPE_POINT = 1;

    public static final int SHAPE_POLYLINE = 3;

    public static final int SHAPE_POLYGON = 5;

    public static final int SHAPE_MULTIPOINT = 8;

    public static final int SHAPE_POINTZ = 11;

    public static final int SHAPE_POLYLINEZ = 13;

    public static final int SHAPE_POLYGONZ = 15;

    public static final int SHAPE_MULTIPOINTZ = 18;

    public static final int SHAPE_POINTM = 21;

    public static final int SHAPE_POLYLINEM = 23;

    public static final int SHAPE_POLYGONM = 25;

    public static final int SHAPE_MULTIPOINTM = 28;

    public static final int SHAPE_MULTIPATCH = 31;

    /**File Code, must be the value 9994*/

    int myFileCode = 9994;

    /**

     * Unused 1;

     */

    int myUnused1 = 0;

    /**

     * Unused 2;

     */

    int myUnused2 = 0;

    /**

     * Unused 3;

     */

    int myUnused3 = 0;

    /**

     * Unused 4;

     */

    int myUnused4 = 0;

    /**

     * Unused 5;

     */

    int myUnused5 = 0;

    /**File Length;*/

    int myFileLength = 0;

    /**Version of the file.*/

    int myVersion = 1000;

    int myShapeType = 0;

    /**

     * BoundingBox Xmin

     */

    double myXmin = 0;

    /**

     * BoundingBox Ymin

     */

    double myYmin = 0;

    /**

     * BoundingBox Xmax

     */

    double myXmax = 0;

    /**

     * BoundingBox Ymax

     */

    double myYmax = 0;

    /**

     * BoundingBox Zmin

     */

    double myZmin = 0;

    /**

     * BoundingBox Zmax

     */

    double myZmax = 0;

    /**

     * BoundingBox Zmin

     */

    double myMmin = 0;

    /**

     * BoundingBox Zmax

     */

    double myMmax = 0;

    // notify about warnings.

    private boolean myWarning = true;

    /**

     * ShapeFileHeader constructor comment.

     */

    public ShpFileHeader() {

        super();

    }

    /** Return the file code. */

    public int getFileCode() {

        return myFileCode;

    }

    /** Return the version of the file. */

    public int getVersion() {

        return myVersion;

    }

    /** Get the extents of the shape file. */

    public java.awt.geom.Rectangle2D.Double getFileExtents() {

        return new java.awt.geom.Rectangle2D.Double(myXmin, myYmin,

                                                    myXmax - myXmin,

                                                    myYmax - myYmin);

    }

    /** Print warnings to system.out. */

    public void setWarnings(boolean inWarning) {

        myWarning = inWarning;

    }

    /**

     * Return the length of the header in 16 bit words..

     */

    public int getHeaderLength() {

        return 50;

    }

    /**

     * Return the number of 16 bit words in the shape file as recorded in the header

     */

    public int getFileLength() {

        return myFileLength;

    }

    /**

     * Read the header from the shape file.

     */

    public void readHeader(ByteBuffer in) {

        // the first four bytes are integers

        // in.setLittleEndianMode(false);

        in.order(ByteOrder.BIG_ENDIAN);

        myFileCode = in.getInt();

        if (myFileCode != 9994) {

            warn("File Code = " + myFileCode + " Not equal to 9994");

        }

        // From 4 to 8 are unused.

        myUnused1 = in.getInt();

        // From 8 to 12 are unused.

        myUnused2 = in.getInt();

        // From 12 to 16 are unused.

        myUnused3 = in.getInt();

        // From 16 to 20 are unused.

        myUnused4 = in.getInt();

        // From 20 to 24 are unused.

        myUnused5 = in.getInt();

        // From 24 to 28 are the file length.

        myFileLength = in.getInt();

        // From 28 to 32 are the File Version.

        in.order(ByteOrder.LITTLE_ENDIAN);

        myVersion = in.getInt();

        // From 32 to 36 are the Shape Type.

        myShapeType = in.getInt();

        // From 36 to 44 are Xmin.

        myXmin = in.getDouble(); // Double.longBitsToDouble(in.getLong());

        // From 44 to 52 are Ymin.

        myYmin = in.getDouble();

        // From 52 to 60 are Xmax.

        myXmax = in.getDouble();

        // From 60 to 68 are Ymax.

        myYmax = in.getDouble();

        // From 68 to 76 are Zmin.

        myZmin = in.getDouble();

        // From 76 to 84 are Zmax.

        myZmax = in.getDouble();

        // From 84 to 92 are Mmin.

        myMmin = in.getDouble();

        // From 92 to 100 are Mmax.

        myMmax = in.getDouble();

        // that is all 100 bytes of the header.

    }

    private void warn(String inWarn) {

        if (myWarning) {

            System.out.print("WARNING: ");

            System.out.println(inWarn);

        }

    }

}