com.bbn.openmap.dataAccess.shape.output
Class ShpOutputStream

java.lang.Object
  com.bbn.openmap.dataAccess.shape.output.ShpOutputStream

public class ShpOutputStream
extends java.lang.Object

Writes data to a .shp file

Author:

Doug Van Auken

Field Summary

static int	ESRI_RECORD_HEADER_LENGTH
static java.util.logging.Logger	logger
protected GeoCoordTransformation	transform A GeoCoordTransform to use to convert Lat/Lon values in EsriGraphics to projected coordinates.

Constructor Summary

ShpOutputStream(java.io.OutputStream os)
Creates an outputstream to write to

Method Summary

protected int[][]	createPointIndex(OMGraphicList list) Calculates the content length for each record, in terms of words as defined by ESRI documentation.
protected int[][]	createPolyIndex(EsriGraphicList list) Creates a two dimensional array holding a list of shape content lengths and shape content length offsets, as defined in Esri shape file documentation.
protected int[]	getPartOffsets(OMGraphicList sublist) Creates an array whose elements specifies at what index a parts geometry begins
protected int	getPointsPerShape(OMGraphicList sublist) Iterates through a list of shapes, summing the points per part to determine the number of points per shape
protected int[]	getRecordOffsets(int[] contentLengths) Creates an array whose elements specify at what index a shapes geometry begins
GeoCoordTransformation	getTransform() Get the transform being used on the coordinates of the EsriGraphics as they are written to the stream.
void	setTransform(GeoCoordTransformation transform) Set the GeoCoordTransform for the stream, so that the EsriGraphics will have their coordinates transformed as they are written to the stream.
protected void	writeExtents(double[] extents)
int[][]	writeGeometry(EsriGraphicList list) Determine what type of list is given and write it out.
int[][]	writePointGeometry(EsriGraphicList list) Writes point geometry to the class scope LittleEndianOutputStream.
int[][]	writePolyGeometry(EsriGraphicList list) Writes polygon geometry to the class scope LittleEndianInputStream.

Methods inherited from class java.lang.Object

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

Field Detail

logger

public static java.util.logging.Logger logger

ESRI_RECORD_HEADER_LENGTH

public static final int ESRI_RECORD_HEADER_LENGTH

See Also:

Constant Field Values

transform

protected GeoCoordTransformation transform

A GeoCoordTransform to use to convert Lat/Lon values in EsriGraphics to projected coordinates.

Constructor Detail

ShpOutputStream

public ShpOutputStream(java.io.OutputStream os)

Creates an outputstream to write to

Parameters:

os - The output stream to write to

Method Detail

getTransform

public GeoCoordTransformation getTransform()

Get the transform being used on the coordinates of the EsriGraphics as they are written to the stream.

Returns:

GeoCoordTransform if used, may be null for no transformation.

setTransform

public void setTransform(GeoCoordTransformation transform)

Set the GeoCoordTransform for the stream, so that the EsriGraphics will have their coordinates transformed as they are written to the stream. If null, the coordinates will be unchanged.

Parameters:

transform -

writeGeometry

public int[][] writeGeometry(EsriGraphicList list)
                      throws java.io.IOException

Determine what type of list is given and write it out.

Parameters:

list - The EsriGraphicList to write

Returns:

The index data that is used to create the .shx file

Throws:

java.io.IOException

createPointIndex

protected int[][] createPointIndex(OMGraphicList list)

Calculates the content length for each record, in terms of words as defined by ESRI documentation. A word is 16 bits, so a double is 4 words and an int is 2 words.

Parameters:

list - The EsriGraphicList to write

Returns:

The index data that is used to create the .shx file

createPolyIndex

protected int[][] createPolyIndex(EsriGraphicList list)

Creates a two dimensional array holding a list of shape content lengths and shape content length offsets, as defined in Esri shape file documentation. This array is used to create the .shx file

Parameters:

list - The list from which to create the respective array

Returns:

The index data that is used to create the .shx file

getRecordOffsets

protected int[] getRecordOffsets(int[] contentLengths)

Creates an array whose elements specify at what index a shapes geometry begins

Parameters:

contentLengths - The array for which to get offsets from

Returns:

An array of record offsets

getPartOffsets

protected int[] getPartOffsets(OMGraphicList sublist)

Creates an array whose elements specifies at what index a parts geometry begins

Parameters:

sublist - A list of shapes

Returns:

An array of part offsets

getPointsPerShape

protected int getPointsPerShape(OMGraphicList sublist)

Iterates through a list of shapes, summing the points per part to determine the number of points per shape

Parameters:

sublist - A list of shapes

Returns:

The number of points for a given shape

writeExtents

protected void writeExtents(double[] extents)
                     throws java.io.IOException

Throws:

java.io.IOException

writePolyGeometry

public int[][] writePolyGeometry(EsriGraphicList list)
                          throws java.io.IOException

Writes polygon geometry to the class scope LittleEndianInputStream.

Parameters:

list - The list of geometry objects to save

Returns:

A two dimensional array containing shape offsets and content lengths

Throws:

java.io.IOException

writePointGeometry

public int[][] writePointGeometry(EsriGraphicList list)
                           throws java.io.IOException

Writes point geometry to the class scope LittleEndianOutputStream.

Parameters:

list - An EsriGraphicList of points

Returns:

A two dimensional array containing shape offsets and content lengths

Throws:

java.io.IOException