org.geotools.data.shapefile.fid

Class IndexedFidWriter

Object

IndexedFidWriter

All Implemented Interfaces:

FileReader, FileWriter

public class IndexedFidWriter
extends Object
implements FileWriter

The Writer writes out the fid and record number of features to the fid index file.

Author:

Jesse

Field Summary

Fields

Modifier and Type	Field and Description
static IndexedFidWriter	EMPTY_WRITER
static int	HEADER_SIZE
static int	RECORD_SIZE

Constructor Summary

Constructors

Constructor and Description
IndexedFidWriter(ShpFiles shpFiles) Creates a new instance and writes the fids to a storage file which is replaces the original on close().
IndexedFidWriter(ShpFiles shpFiles, StorageFile storageFile) Create a new instance Note: StorageFile.replaceOriginal() is NOT called.

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	hasNext()
String	id() An id for the writer.
boolean	isClosed()
long	next()
void	remove() Increments the fidIndex by 1.
void	write() Writes the current fidIndex.

Methods inherited from class Object

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

Field Detail

HEADER_SIZE

public static final int HEADER_SIZE

See Also:

Constant Field Values

RECORD_SIZE

public static final int RECORD_SIZE

See Also:

Constant Field Values

EMPTY_WRITER

public static final IndexedFidWriter EMPTY_WRITER

Constructor Detail

IndexedFidWriter

public IndexedFidWriter(ShpFiles shpFiles)
                 throws IOException

Creates a new instance and writes the fids to a storage file which is replaces the original on close().

Parameters:

shpFiles - The shapefiles to used

Throws:

IOException

IndexedFidWriter

public IndexedFidWriter(ShpFiles shpFiles,
                        StorageFile storageFile)
                 throws IOException

Create a new instance
Note: StorageFile.replaceOriginal() is NOT called. Call IndexedFidWriter(ShpFiles) for that behaviour.

Parameters:

shpFiles - The shapefiles to used

storageFile - the storage file that will be written to. It will NOT be closed.

Throws:

IOException

Method Detail

hasNext

public boolean hasNext()
                throws IOException

Throws:

IOException

next

public long next()
          throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Throws:

IOException

remove

public void remove()
            throws IOException

Increments the fidIndex by 1.

Indicates that a feature was removed from the location. This is intended to ensure that FIDs stay constant over time. Consider the following case of 5 features.

• feature 1 has fid typename.0
• feature 2 has fid typename.1
• feature 3 has fid typename.2
• feature 4 has fid typename.3
• feature 5 has fid typename.4

when feature 3 is removed/deleted the following usage of the write should take place:

• next(); (move to feature 1)
• next(); (move to feature 2)
• next(); (move to feature 3)
• remove();(delete feature 3)
• next(); (move to feature 4)
• // optional write(); (write feature 4)
• next(); (move to feature 5)
• write(); (write(feature 5)

Throws:

IOException - if current fid index is null

write

public void write()
           throws IOException

Writes the current fidIndex. Writes to the same place in the file each time. Only next() moves forward in the file.

Throws:

IOException

See Also:

next(), remove()

isClosed

public boolean isClosed()

id

public String id()

Description copied from interface: FileWriter

An id for the writer. This is only used for debugging.

Specified by:

id in interface FileReader

Specified by:

id in interface FileWriter

Returns:

id for the writer.