Package ch.so.agi.gretl.internal.shapefile.core

Class ShpWriter

java.lang.Object

ch.so.agi.gretl.internal.shapefile.core.ShpWriter

All Implemented Interfaces:

AutoCloseable

public final class ShpWriter
extends Object
implements AutoCloseable

Low-level writer for the .shp main file.

This writer is byte-level only: it writes the 100-byte header and individual record blocks (8-byte big-endian record header followed by the little-endian content of an EncodedShape). Geometry-to-bytes encoding lives in ShpGeometryEncoder so that the core package stays free of JTS encoding logic.

The FileChannel is owned by ShapefileDatasetWriter; close() therefore does not close the channel.

Constructor Summary

Constructors

Constructor	Description
ShpWriter(FileChannel channel, ShapeType shapeType)

Method Summary

Modifier and Type	Method	Description
void	close()
ShapeType	shapeType()
void	writeHeader(ShapefileHeader header)	Writes (or patches) the 100-byte file header at the start of the file.
void	writeRecord(int recordNumber, EncodedShape encoded)	Appends a single record at the current channel position.

Methods inherited from class java.lang.Object

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

Constructor Details

ShpWriter

public ShpWriter(FileChannel channel,
 ShapeType shapeType)

Method Details

shapeType

public ShapeType shapeType()

writeHeader

public void writeHeader(ShapefileHeader header)
                 throws IOException,
ShapefileMappingException

Writes (or patches) the 100-byte file header at the start of the file.

Throws:

IOException

ShapefileMappingException

writeRecord

public void writeRecord(int recordNumber,
 EncodedShape encoded)
                 throws IOException,
ShapefileMappingException

Appends a single record at the current channel position.

The record header (record number and content length in 16-bit words) is big-endian; the content is the little-endian EncodedShape.content() buffer produced by the encoder.

Throws:

IOException

ShapefileMappingException

close

public void close()

Specified by:

close in interface AutoCloseable