org.geotools.data.shapefile.fid

Class IndexedFidReader

Object

IndexedFidReader

All Implemented Interfaces:

FIDReader, FileReader

public class IndexedFidReader
extends Object
implements FIDReader, FileReader

This object reads from a file the fid of a feature in a shapefile.

Author:

Jesse

Constructor Summary

Constructors

Constructor and Description
IndexedFidReader(ShpFiles shpFiles)
IndexedFidReader(ShpFiles shpFiles, ReadableByteChannel in)

Method Summary

Modifier and Type	Method and Description
void	close() Release any resources associated with this reader
int	currentSHXIndex() Returns the record number of the feature in the shx or shp that is identified by the the last fid returned by next().
long	findFid(String fid) Returns the offset to the location in the SHX file that the fid identifies.
long	getCount() Returns the number of Fid Entries in the file.
long	getCurrentFIDIndex() Returns the index that is appended to the typename to construct the fid.
int	getRemoves() Returns the number of features that have been removed since the fid index was regenerated.
void	goTo(long recno)
boolean	hasNext() Returns whether another fid exists for this reader.
String	id() An id for the reader.
String	next() Gets the next FID from the Reader.

Methods inherited from class Object

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

Constructor Detail

IndexedFidReader

public IndexedFidReader(ShpFiles shpFiles)
                 throws IOException

Throws:

IOException

IndexedFidReader

public IndexedFidReader(ShpFiles shpFiles,
                        ReadableByteChannel in)
                 throws IOException

Throws:

IOException

Method Detail

getCount

public long getCount()

Returns the number of Fid Entries in the file.

Returns:

Returns the number of Fid Entries in the file.

getRemoves

public int getRemoves()

Returns the number of features that have been removed since the fid index was regenerated.

Returns:

Returns the number of features that have been removed since the fid index was regenerated.

findFid

public long findFid(String fid)
             throws IOException

Returns the offset to the location in the SHX file that the fid identifies. This search take logN time.

Parameters:

fid - the fid to find.

Returns:

Returns the record number of the record in the SHX file that the fid identifies. Will return -1 if the fid was not found.

Throws:

IOException

goTo

public void goTo(long recno)
          throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Description copied from interface: FIDReader

Release any resources associated with this reader

Specified by:

close in interface FIDReader

Throws:

IOException

hasNext

public boolean hasNext()
                throws IOException

Description copied from interface: FIDReader

Returns whether another fid exists for this reader.

Specified by:

hasNext in interface FIDReader

Returns:

true if more content exists

Throws:

IOException

next

public String next()
            throws IOException

Description copied from interface: FIDReader

Gets the next FID from the Reader.

Specified by:

next in interface FIDReader

Returns:

Next featureID

Throws:

IOException

currentSHXIndex

public int currentSHXIndex()

Returns the record number of the feature in the shx or shp that is identified by the the last fid returned by next().

Returns:

Returns the record number of the feature in the shx or shp that is identified by the the last fid returned by next().

getCurrentFIDIndex

public long getCurrentFIDIndex()

Returns the index that is appended to the typename to construct the fid.

Returns:

the index that is appended to the typename to construct the fid.

id

public String id()

Description copied from interface: FileReader

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

Specified by:

id in interface FileReader

Returns:

id for the reader.