Class HDTTriplesSectionBitmap

java.lang.Object

org.eclipse.rdf4j.rio.hdt.HDTPart

org.eclipse.rdf4j.rio.hdt.HDTTriplesSection

org.eclipse.rdf4j.rio.hdt.HDTTriplesSectionBitmap

All Implemented Interfaces:

Iterator<int[]>

class HDTTriplesSectionBitmap
extends HDTTriplesSection

HDT Triples section.

This part contains two levels of bitmaps and arrays.

Typically (in SPO order), the Y-level corresponds to the predicates and the Z-level to the objects.

The X (subjects) is implicit since triples are already ordered by X, and bitmap Y is used to notify when there is a new X: X will be used until a 1 is found in bitmap Y, which indicates that the next triple uses X+1.

The array contains numeric references to the predicates and objects in the HDT dictionaries, starting with the entries in the "shared" Dictionary These positions are counted starting with 1, not 0.

E.g. Y-bitmap 0 1 1 and Y-array 1 2 3 results in S1-P1 S1-P2 S2-P3

Structure:

+----------+----------+---------+---------+
| Bitmap Y | Bitmap Z | Array Y | Array Z |
+----------+----------+---------+---------+

Nested Class Summary

Nested classes/interfaces inherited from class HDTPart

HDTPart.Type

Field Summary

Fields

Modifier and Type	Field	Description
private HDTArray	arrY
private HDTArray	arrZ
private HDTBitmap	bitmapY
private HDTBitmap	bitmapZ
private int	posX
private int	posY
private int	posZ
private int	sizeY
private int	sizeZ

Fields inherited from class HDTPart

COOKIE, name, pos, properties

Constructor Summary

Constructors

Constructor	Description
HDTTriplesSectionBitmap()

Method Summary

Modifier and Type	Method	Description
boolean	hasNext()
int[]	next()
protected void	parse(InputStream is)	Parse from input stream
protected void	parse(InputStream is, HDTTriples.Order order)	Parse triples section and return the triple parts in the correct S,P,O order.

Methods inherited from class HDTPart

checkControl, checkCRC, checkFormat, countToNull, getDebugPartStr, getIntegerProperty, getProperties, getProperties, mapProperties, readToNull

Methods inherited from class Object

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

Methods inherited from interface Iterator

forEachRemaining, remove

Field Details

bitmapY

private HDTBitmap bitmapY

bitmapZ

private HDTBitmap bitmapZ

arrY

private HDTArray arrY

arrZ

private HDTArray arrZ

sizeY

private int sizeY

sizeZ

private int sizeZ

posX

private int posX

posY

private int posY

posZ

private int posZ

Constructor Details

HDTTriplesSectionBitmap

HDTTriplesSectionBitmap()

Method Details

hasNext

public boolean hasNext()

next

public int[] next()

parse

protected void parse(InputStream is)
              throws IOException

Description copied from class: HDTPart

Parse from input stream

Specified by:

parse in class HDTPart

Parameters:

is -

Throws:

IOException

parse

protected void parse(InputStream is,
 HDTTriples.Order order)
              throws IOException

Description copied from class: HDTTriplesSection

Parse triples section and return the triple parts in the correct S,P,O order.

Specified by:

parse in class HDTTriplesSection

Parameters:

is -

order -

Throws:

IOException