/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jena.larq.examples;
import org.apache.jena.larq.IndexBuilderString;
import org.apache.jena.larq.IndexLARQ;
import org.apache.jena.larq.LARQ;
import org.apache.jena.atlas.lib.StrUtils;
import com.hp.hpl.jena.query.ARQ;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryExecution;
import com.hp.hpl.jena.query.QueryExecutionFactory;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.ResultSetFormatter;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.sparql.util.Utils;
import com.hp.hpl.jena.util.FileManager;
/** Example code to load a model from a file, index all string literals,
* then execute a SPARQL query with a Lucene search in it. */
public class ExLucene1
{
public static void main(String[] a) throws Exception
{
System.out.println("ARQ Example: "+Utils.classShortName(ExLucene1.class)) ;
System.out.println("ARQ: "+ARQ.VERSION) ;
System.out.println() ;
Model model = ModelFactory.createDefaultModel() ;
IndexLARQ index = buildIndex(model, "src/test/resources/LARQ/data-1.ttl") ;
// Search for
String searchString = "+document" ;
String queryString = StrUtils.strjoin("\n",
"PREFIX pf: <http://jena.hpl.hp.com/ARQ/property#>",
"PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>" ,
"PREFIX : <http://example/>" ,
"SELECT * {" ,
" ?lit pf:textMatch '"+searchString+"'.",
"}") ;
// Three documents should match.
performQuery(model, index, queryString) ;
index.close() ;
}
static IndexLARQ buildIndex(Model model, String datafile)
{
// ---- Read and index all literal strings.
IndexBuilderString larqBuilder = new IndexBuilderString() ;
// Index statements as they are added to the model.
model.register(larqBuilder) ;
// To just build the index, create a model that does not store statements
// Model model2 = ModelFactory.createModelForGraph(new GraphSink()) ;
FileManager.get().readModel(model, datafile) ;
// ---- Alternatively build the index after the model has been created.
// larqBuilder.indexStatements(model.listStatements()) ;
// ---- Finish indexing
larqBuilder.closeWriter() ;
model.unregister(larqBuilder) ;
// ---- Create the access index
IndexLARQ index = larqBuilder.getIndex() ;
return index ;
}
static void performQuery(Model model, IndexLARQ index, String queryString)
{
// Make globally available
LARQ.setDefaultIndex(index) ;
Query query = QueryFactory.create(queryString) ;
query.serialize(System.out) ;
System.out.println();
QueryExecution qExec = QueryExecutionFactory.create(query, model) ;
//LARQ.setDefaultIndex(qExec.getContext(), index) ;
ResultSetFormatter.out(System.out, qExec.execSelect(), query) ;
qExec.close() ;
}
}