Package org.aksw.jenax.io.json.accumulator

Class AccJsonDriver

java.lang.Object

org.aksw.jenax.io.json.accumulator.AccJsonDriver

public class AccJsonDriver
extends Object

This class implements the driver for accumulating (json) objects from a sequence of edges (triples/quads). The AccJson objects can be seen as states in a state automaton, and this class drives the transition between the states based on the input.

Field Summary

Fields

Modifier and Type	Field	Description
protected org.apache.jena.graph.Node	currentSource
protected AccJson	currentState
protected boolean	isSingle
protected long	sourcesSeen

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AccJsonDriver(AccJson rootAcc, boolean isSingle)

Method Summary

Modifier and Type	Method	Description
void	accumulate(org.apache.jena.sparql.core.Quad input, AccContextRdf cxt)	We expect each root node to be announced with a dummy quad that does not carry any edge information (s, s, ANY, ANY)
Stream<Map.Entry<org.apache.jena.graph.Node,RdfElement>>	asStream(AccContextRdf cxt, Stream<org.apache.jena.sparql.core.Quad> quadStream)
void	begin(AccContextRdf cxt)
void	end(AccContextRdf cxt)
protected void	endCurrentItem(AccContextRdf cxt)	Recursively calls end() on the current accumulator and all its ancestors
long	getSourcesSeen()
RdfElement	getValue()
static AccJsonDriver	of(AccJson rootAcc, boolean isSingle)

Methods inherited from class java.lang.Object

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

Field Details

currentState

protected AccJson currentState

currentSource

protected org.apache.jena.graph.Node currentSource

sourcesSeen

protected long sourcesSeen

isSingle

protected boolean isSingle

Constructor Details

AccJsonDriver

protected AccJsonDriver(AccJson rootAcc,
 boolean isSingle)

Method Details

of

public static AccJsonDriver of(AccJson rootAcc,
 boolean isSingle)

getSourcesSeen

public long getSourcesSeen()

accumulate

public void accumulate(org.apache.jena.sparql.core.Quad input,
 AccContextRdf cxt)
                throws IOException

We expect each root node to be announced with a dummy quad that does not carry any edge information (s, s, ANY, ANY)

Parameters:

input -

cxt -

Throws:

IOException

begin

public void begin(AccContextRdf cxt)
           throws IOException

Throws:

IOException

end

public void end(AccContextRdf cxt)
         throws IOException

Throws:

IOException

getValue

public RdfElement getValue()

endCurrentItem

protected void endCurrentItem(AccContextRdf cxt)
                       throws IOException

Recursively calls end() on the current accumulator and all its ancestors

Throws:

IOException

asStream

public Stream<Map.Entry<org.apache.jena.graph.Node,RdfElement>> asStream(AccContextRdf cxt,
 Stream<org.apache.jena.sparql.core.Quad> quadStream)