Package arq.examples.larq

Source Code of arq.examples.larq.ExLucene1

/*
* (c) Copyright 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
* All rights reserved.
* [See end of file]
*/

package arq.examples.larq;


import org.openjena.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.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.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,  "testing/LARQ/data-1.ttl") ;
       
        // Search for
        String searchString = "+document" ;
       
        String queryString = StrUtils.strjoin("\n",
            "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, 2009 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.
*/
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