org.h2gis.functions.io.shp.internal

Class ShapefileReader

java.lang.Object

org.h2gis.functions.io.shp.internal.ShapefileReader

public class ShapefileReader
extends Object

The general use of this class is:

 FileChannel in = new FileInputStream("thefile.dbf").getChannel();
 ShapefileReader r = new ShapefileReader( in ) while (r.hasNext()) { Geometry
 shape = (Geometry) r.nextRecord().shape() // do stuff } r.close();

 

You don't have to immediately ask for the shape from the record. The record will contain the bounds of the shape and will only read the shape when the shape() method is called. This ShapefileReader.Record is the same object every time, so if you need data from the Record, be sure to copy it.

Author:

jamesm, aaime, Ian Schneider

Constructor Summary

Constructors

Constructor and Description
ShapefileReader(FileChannel channel) Creates a new instance of ShapeFile.

Method Summary

Modifier and Type	Method and Description
void	close() Clean up any resources.
org.locationtech.jts.geom.Geometry	geomAt(int offset) Fetch the next record information.
ShapefileHeader	getHeader() Get the header.
static ShapefileHeader	readHeader(ReadableByteChannel channel) A short cut for reading the header from the given channel.
void	setHandler(ShapeHandler handler)

Methods inherited from class java.lang.Object

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

Constructor Detail

ShapefileReader

public ShapefileReader(FileChannel channel)
                throws IOException,
                       ShapefileException

Creates a new instance of ShapeFile.

Parameters:

channel - The ReadableByteChannel this reader will use.

Throws:

IOException - If problems arise.

ShapefileException - If for some reason the file contains invalid records.

Method Detail

readHeader

public static ShapefileHeader readHeader(ReadableByteChannel channel)
                                  throws IOException

A short cut for reading the header from the given channel.

Parameters:

channel - The channel to read from.

Returns:

A ShapefileHeader object.

Throws:

IOException - If problems arise.

getHeader

public ShapefileHeader getHeader()

Get the header. Its parsed in the constructor.

Returns:

The header that is associated with this file.

close

public void close()
           throws IOException

Clean up any resources. Closes the channel.

Throws:

IOException - If errors occur while closing the channel.

geomAt

public org.locationtech.jts.geom.Geometry geomAt(int offset)
                                          throws IOException

Fetch the next record information.

Parameters:

offset -

Returns:

The record instance associated with this reader.

Throws:

IOException

setHandler

public void setHandler(ShapeHandler handler)

Parameters:

handler - The handler to set.