org.h2gis.drivers.shp.internal
Interface ShapeHandler

All Known Implementing Classes:

MultiLineHandler, MultiPointHandler, PointHandler, PolygonHandler

public interface ShapeHandler

A ShapeHandler defines what is needed to construct and persist geometries based upon the shapefile specification.

Author:

aaime, Ian Schneider

Method Summary

int	getLength(Object geometry) Get the length of the given geometry Object in bytes not 16-bit words.
ShapeType	getShapeType() Get the ShapeType of this handler.
com.vividsolutions.jts.geom.Geometry	read(ReadBufferManager buffer, ShapeType type) Read a geometry from the ByteBuffer.
void	write(WriteBufferManager shapeBuffer, Object geometry) Write the geometry into the ByteBuffer.

Method Detail

getShapeType

ShapeType getShapeType()

Get the ShapeType of this handler.

Returns:

The ShapeType.

read

com.vividsolutions.jts.geom.Geometry read(ReadBufferManager buffer,
                                          ShapeType type)
                                          throws IOException

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.

Parameters:

buffer - The ByteBuffer to read from.

Returns:

A geometry object.

Throws:

IOException

write

void write(WriteBufferManager shapeBuffer,
           Object geometry)
           throws IOException

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.

Parameters:

shapeBuffer - The ByteBuffer to write to.

geometry - The geometry to write.

Throws:

IOException

getLength

int getLength(Object geometry)

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.

Parameters:

geometry - The geometry to analyze.

Returns:

The number of bytes the shape will take up.