Package org.aksw.iguana.cc.query.impl

Class PatternQueryHandler

java.lang.Object

org.aksw.iguana.cc.query.AbstractWorkerQueryHandler

org.aksw.iguana.cc.query.impl.InstancesQueryHandler

org.aksw.iguana.cc.query.impl.PatternQueryHandler

All Implemented Interfaces:

QueryHandler

@Shorthand("PatternQueryHandler")
public class PatternQueryHandler
extends InstancesQueryHandler

This QueryHandler uses query patterns and converts them into query instances.
A query pattern is a SPARQL 1.1 Query which can have additional variables %%var[0/9]+%% in the Basic Graph Pattern.

For example: SELECT * {?s %%var1%% ?o . ?o <http://exa.com> %%var100%%}
This QueryHandler will then convert this query to:
SELECT ?var1 ?var100 {?s ?var1 ?o . ?o <http://exa.com> ?var100}
and will request query solutions from a user given sparql endpoint (e.g DBpedia)
The solution will then be instantiated into the query pattern. The result can look like follows:

SELECT * {?s <http://prop/1> ?o . ?o <http://exa.com> "123"}
SELECT * {?s <http://prop/1> ?o . ?o <http://exa.com> "12"}
SELECT * {?s <http://prop/2> ?o . ?o <http://exa.com> "1234"}

Author:

f.conrads

Constructor Summary

Constructors

Constructor	Description
PatternQueryHandler(java.util.LinkedList<Worker> workers, java.lang.String service, java.lang.Long limit)	The constructor for the pattern based QueryHandler.
PatternQueryHandler(java.util.LinkedList<Worker> workers, java.lang.String service, java.lang.String limit)	The constructor for the pattern based QueryHandler.
PatternQueryHandler(java.util.List<Worker> workers, java.lang.String endpoint)	The constructor for the pattern based QueryHandler.

Method Summary

Methods inherited from class org.aksw.iguana.cc.query.impl.InstancesQueryHandler

generateTripleStats, setOutputFolder

Methods inherited from class org.aksw.iguana.cc.query.AbstractWorkerQueryHandler

generate

Methods inherited from class java.lang.Object

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

Constructor Detail

PatternQueryHandler

public PatternQueryHandler(java.util.List<Worker> workers,
                           java.lang.String endpoint)

The constructor for the pattern based QueryHandler.
Query Instances will be restricted to 2000 per QueryPattern

This will check all Workers if they are of type SPARQL or UPDATEWorker and gets their querysFile/updatePath to generate queries out of it.

Parameters:

workers -

endpoint - the sparql endpoint to derive the variable instances

PatternQueryHandler

public PatternQueryHandler(java.util.LinkedList<Worker> workers,
                           java.lang.String service,
                           java.lang.String limit)

The constructor for the pattern based QueryHandler.

This will check all Workers if they are of type SPARQL or UPDATEWorker and gets their querysFile/updatePath to generate queries out of it.

Parameters:

workers -

service - the sparql endpoint to derive the variable instances

limit - the resitriction of query instances per query pattern as String

PatternQueryHandler

public PatternQueryHandler(java.util.LinkedList<Worker> workers,
                           java.lang.String service,
                           java.lang.Long limit)

The constructor for the pattern based QueryHandler.

This will check all Workers if they are of type SPARQL or UPDATEWorker and gets their querysFile/updatePath to generate queries out of it.

Parameters:

workers -

service - the sparql endpoint to derive the variable instances

limit - the resitriction of query instances per query pattern