Package org.h2gis.functions.io.shp.internal

Class PolygonHandler

java.lang.Object
org.h2gis.functions.io.shp.internal.PolygonHandler
All Implemented Interfaces:
ShapeHandler
public class PolygonHandler extends Object implements ShapeHandler
Wrapper for a Shapefile polygon.
Version:
$Id: PolygonHandler.java 22264 2006-10-19 10:10:35Z acuster $
Author:
aaime, Ian Schneider
See Also:
  • "http://svn.geotools.org/geotools/tags/2.3.1/plugin/shapefile/src/org/geotools/data/shapefile/shp/PolygonHandler.java"

  • Constructor Summary

    Constructors
    Constructor
    Description
    PolygonHandler()
     
    PolygonHandler(ShapeType type)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static int
    computeOrientation(org.locationtech.jts.geom.CoordinateSequence cs, int p1, int p2, int q)
     
    int
    getLength(org.locationtech.jts.geom.Geometry geometry)
    Get the length of the given geometry Object in bytes not 16-bit words.
    ShapeType
    getShapeType()
    Get the ShapeType of this handler.
    static boolean
    isCCW(org.locationtech.jts.geom.CoordinateSequence ring)
    Computes whether a ring defined by an array of Coordinates is oriented counter-clockwise.
    org.locationtech.jts.geom.Geometry
    read(ReadBufferManager buffer, ShapeType type)
    Read a geometry from the ByteBuffer.The buffer's position, byteOrder, and limit are set to that which is needed.
    void
    write(WriteBufferManager buffer, org.locationtech.jts.geom.Geometry geometry)
    Write the geometry into the ByteBuffer.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

  • Method Details

    • getShapeType

      public ShapeType getShapeType()
      Description copied from interface: ShapeHandler
      Get the ShapeType of this handler.
      Specified by:
      getShapeType in interface ShapeHandler
      Returns:
      The ShapeType.

    • getLength

      public int getLength(org.locationtech.jts.geom.Geometry geometry)
      Description copied from interface: ShapeHandler
      Get the length of the given geometry Object in bytes not 16-bit words. This is easier to keep track of, since the ByteBuffer deals with bytes. Do not include the 8 bytes of record.
      Specified by:
      getLength in interface ShapeHandler
      Parameters:
      geometry - The geometry to analyze.
      Returns:
      The number of bytes the shape will take up.

    • read

      public org.locationtech.jts.geom.Geometry read(ReadBufferManager buffer, ShapeType type) throws IOException
      Description copied from interface: ShapeHandler
      Read a geometry from the ByteBuffer.The buffer's position, byteOrder, and limit are set to that which is needed. The record has been read as well as the shape type integer. The handler need not worry about reading unused information as the ShapefileReader will correctly adjust the buffer position after this call.
      Specified by:
      read in interface ShapeHandler
      Parameters:
      buffer - The ByteBuffer to read from.
      type - The shape type
      Returns:
      A geometry object.
      Throws:
      IOException

    • isCCW

      public static boolean isCCW(org.locationtech.jts.geom.CoordinateSequence ring)
      Computes whether a ring defined by an array of Coordinates is oriented counter-clockwise.
      • The list of points is assumed to have the first and last points equal.
      • This will handle coordinate lists which contain repeated points.
      This algorithm is only guaranteed to work with valid rings. If the ring is invalid (e.g. self-crosses or touches), the computed result may not be correct.
      Parameters:
      ring - an array of Coordinates forming a ring
      Returns:
      true if the ring is oriented counter-clockwise.

    • computeOrientation

      public static int computeOrientation(org.locationtech.jts.geom.CoordinateSequence cs, int p1, int p2, int q)

    • write

      public void write(WriteBufferManager buffer, org.locationtech.jts.geom.Geometry geometry) throws IOException
      Description copied from interface: ShapeHandler
      Write the geometry into the ByteBuffer. The position, byteOrder, and limit are all set. The handler is not responsible for writing the record or shape type integer.
      Specified by:
      write in interface ShapeHandler
      Parameters:
      buffer - The ByteBuffer to write to.
      geometry - The geometry to write.
      Throws:
      IOException