`/*
* (c) Copyright 2006, 2007, 2008 Hewlett-Packard Development Company, LP
* All rights reserved.
* [See end of file]
*/
package arq.examples.larq;
import com.hp.hpl.jena.query.*;
import com.hp.hpl.jena.query.larq.IndexBuilderString;
import com.hp.hpl.jena.query.larq.IndexLARQ;
import com.hp.hpl.jena.query.larq.LARQ;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.sparql.util.StringUtils;
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.
*
* @author Andy Seaborne
*/
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, "testing/LARQ/data-1.ttl") ;
// Search for
String searchString = "+document" ;
String queryString = StringUtils.join("\n", new String[]{
"PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>" ,
"PREFIX : <http://example/>" ,
"PREFIX pf: <http://jena.hpl.hp.com/ARQ/property#>",
"SELECT * {" ,
" ?lit pf:textMatch '"+searchString+"'.",
"}"
}) ;
// Two of three docuemnts 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() ;
}
}
/*
* (c) Copyright 2006, 2007, 2008 Hewlett-Packard Development Company, LP
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/`