Package org.h2gis.functions.io.fgb.fileTable

Class FGBDriver

java.lang.Object

org.h2gis.functions.io.fgb.fileTable.FGBDriver

All Implemented Interfaces:

org.h2gis.api.FileDriver

public class FGBDriver
extends Object
implements org.h2gis.api.FileDriver

FlatGeobuffer reader driver

Author:

Erwan Bocher, Nicolas Fortin

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FGBDriver.FGBDriverCursor

Constructor Summary

Constructors

Constructor	Description
FGBDriver()

Method Summary

Modifier and Type	Method	Description
void	cacheFeatureAddressFromIndex()	Using the Spatial index it is possible to quickly cache the file address of all features.
void	close()
int	getEstimatedRowSize(long rowId)
long	getFeaturesOffset()
org.h2.value.Value	getField(long rowId, int columnId)
int	getFieldCount()
static org.h2.value.Value[]	getFieldsFromFileLocation(FileChannel fileChannel, long featureAddress, long featuresOffset, org.wololo.flatgeobuf.HeaderMeta headerMeta, int geometryFieldIndex)
int	getGeometryFieldIndex()
org.wololo.flatgeobuf.HeaderMeta	getHeader()
long	getRowCount()
void	initDriverFromFile(File fgbFile)	Init file header for DBF File
void	insertRow(Object[] values)
boolean	isCacheRowAddress()
org.h2.index.Cursor	queryIndex(org.locationtech.jts.geom.Envelope queryEnvelope)
void	setCacheRowAddress(boolean cacheRowAddress)

Methods inherited from class java.lang.Object

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

Constructor Detail

FGBDriver

public FGBDriver()

Method Detail

initDriverFromFile

public void initDriverFromFile(File fgbFile)
                        throws IOException

Init file header for DBF File

Parameters:

fgbFile - DBF File path

Throws:

IOException

isCacheRowAddress

public boolean isCacheRowAddress()

setCacheRowAddress

public void setCacheRowAddress(boolean cacheRowAddress)

Parameters:

cacheRowAddress - If true the feature file address will be cached in order to reduce random access time. If the file will be read sequentially only you can disable the cache in order to reduce the memory footprint

getHeader

public org.wololo.flatgeobuf.HeaderMeta getHeader()

getRowCount

public long getRowCount()

Specified by:

getRowCount in interface org.h2gis.api.FileDriver

getEstimatedRowSize

public int getEstimatedRowSize(long rowId)

Specified by:

getEstimatedRowSize in interface org.h2gis.api.FileDriver

getFieldCount

public int getFieldCount()

Specified by:

getFieldCount in interface org.h2gis.api.FileDriver

close

public void close()
           throws IOException

Specified by:

close in interface org.h2gis.api.FileDriver

Throws:

IOException

queryIndex

public org.h2.index.Cursor queryIndex(org.locationtech.jts.geom.Envelope queryEnvelope)
                               throws IOException

Throws:

IOException

cacheFeatureAddressFromIndex

public void cacheFeatureAddressFromIndex()
                                  throws IOException

Using the Spatial index it is possible to quickly cache the file address of all features. Using this function before doing a random access should reduce the access time.

Throws:

IOException

getFieldsFromFileLocation

public static org.h2.value.Value[] getFieldsFromFileLocation(FileChannel fileChannel,
                                                             long featureAddress,
                                                             long featuresOffset,
                                                             org.wololo.flatgeobuf.HeaderMeta headerMeta,
                                                             int geometryFieldIndex)
                                                      throws IOException

Parameters:

featureAddress - Feature address in the file relative to the first feature

Returns:

Throws:

IOException

getField

public org.h2.value.Value getField(long rowId,
                                   int columnId)
                            throws IOException

Specified by:

getField in interface org.h2gis.api.FileDriver

Throws:

IOException

getFeaturesOffset

public long getFeaturesOffset()

insertRow

public void insertRow(Object[] values)
               throws IOException

Specified by:

insertRow in interface org.h2gis.api.FileDriver

Throws:

IOException

getGeometryFieldIndex

public int getGeometryFieldIndex()

Returns:

Field index of the geometry when using the method getField