net.fortytwo.stream.sparql.etc

Class SolutionSequenceModifier

java.lang.Object

net.fortytwo.stream.sparql.etc.SolutionSequenceModifier

public class SolutionSequenceModifier
extends Object

Author:

Joshua Shinavier (http://fortytwo.net)

Constructor Summary

Constructors

Constructor and Description
SolutionSequenceModifier()

Method Summary

Modifier and Type	Method and Description
void	makeDistinct() Mark the associated query with a DISTINCT modifier
void	makeReduced() Mark the associated query with a REDUCE modifier
void	setLimit(long limit) Sets the LIMIT of the associated query, which puts an upper bound on the number of solutions returned
void	setOffset(long offset) Sets the OFFSET of the associated query.
boolean	trySolution(org.openrdf.query.BindingSet solution, Subscription subs) Pass a potential solution through this sequence modifier to determine whether it should be returned as an answer

Methods inherited from class java.lang.Object

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

Constructor Detail

SolutionSequenceModifier

public SolutionSequenceModifier()

Method Detail

makeDistinct

public void makeDistinct()

Mark the associated query with a DISTINCT modifier

makeReduced

public void makeReduced()

Mark the associated query with a REDUCE modifier

setLimit

public void setLimit(long limit)

Sets the LIMIT of the associated query, which puts an upper bound on the number of solutions returned

Parameters:

limit - the upper bound on the number of solutions returned

setOffset

public void setOffset(long offset)

Sets the OFFSET of the associated query. Do this only once, at query construction time.

Parameters:

offset - the number of solutions which will be generated before query answers are returned

trySolution

public boolean trySolution(org.openrdf.query.BindingSet solution,
                           Subscription subs)
                    throws IOException

Pass a potential solution through this sequence modifier to determine whether it should be returned as an answer

Parameters:

solution - the potential query answer

subs - the subscription to the query. If a LIMIT is exceeded,

Returns:

whether to produce the solution as an answer

Throws:

IOException - if there is a problem communicating with this query engine (for example, if there are network operations involved)