org.wikidata.query.rdf.tool.rdf.client

Class RdfClient

java.lang.Object

org.wikidata.query.rdf.tool.rdf.client.RdfClient

public class RdfClient
extends Object

Low level API to Blazegraph. This provides transport and the ability to execute different kind of queries.

Field Summary

Fields

Modifier and Type	Field and Description
org.eclipse.jetty.client.HttpClient	httpClient Http connection pool for the rdf repository.

Constructor Summary

Constructors

Constructor and Description
RdfClient(org.eclipse.jetty.client.HttpClient httpClient, URI uri, com.github.rholder.retry.Retryer<org.eclipse.jetty.client.api.ContentResponse> retryer, Duration timeout)

Method Summary

Modifier and Type	Method and Description
boolean	ask(String sparql) Execute a SPARQL ask and parse the boolean result.
Integer	loadUrl(String sparql) Loads a uri into this rdf repository.
org.openrdf.query.TupleQueryResult	query(String sparql) Execute some SPARQL which returns a results table.
List<String>	selectToList(String query, String valueBinding, String prefix) Perform a SPARQL query and return the result as list from one column.
com.google.common.collect.ImmutableSetMultimap<String,String>	selectToMap(String query, String keyBinding, String valueBinding) Perform a SPARQL query and return the result as a map.
Integer	update(String sparql) Executes an update and returns the number of changes.

Methods inherited from class java.lang.Object

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

Field Detail

httpClient

public final org.eclipse.jetty.client.HttpClient httpClient

Http connection pool for the rdf repository.

Constructor Detail

RdfClient

public RdfClient(org.eclipse.jetty.client.HttpClient httpClient,
                 URI uri,
                 com.github.rholder.retry.Retryer<org.eclipse.jetty.client.api.ContentResponse> retryer,
                 Duration timeout)

Method Detail

query

public org.openrdf.query.TupleQueryResult query(String sparql)

Execute some SPARQL which returns a results table.

update

public Integer update(String sparql)

Executes an update and returns the number of changes.

ask

public boolean ask(String sparql)

Execute a SPARQL ask and parse the boolean result.

loadUrl

public Integer loadUrl(String sparql)

Loads a uri into this rdf repository. Uses Blazegraph's update with uri's feature.

selectToMap

public com.google.common.collect.ImmutableSetMultimap<String,String> selectToMap(String query,
                                                                                 String keyBinding,
                                                                                 String valueBinding)

Perform a SPARQL query and return the result as a map.

Parameters:

query - SPARQL query, should be SELECT

keyBinding - Binding name to serve as key

valueBinding - Binding name to serve as values

Returns:

Collection of strings resulting from the query.

selectToList

public List<String> selectToList(String query,
                                 String valueBinding,
                                 String prefix)

Perform a SPARQL query and return the result as list from one column.

Parameters:

query - SPARQL query, should be SELECT

valueBinding - Binding name to serve as values

prefix - If specified, remove this prefix from the result

Returns:

Collection of strings resulting from the query.