/**
* 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 java.io.StringReader;
import org.apache.jena.larq.IndexBuilderNode;
import org.apache.jena.larq.IndexLARQ;
import org.openjena.atlas.lib.StrUtils;
import com.hp.hpl.jena.query.ARQ;
import com.hp.hpl.jena.rdf.model.Literal;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.Resource;
import com.hp.hpl.jena.rdf.model.ResourceFactory;
import com.hp.hpl.jena.sparql.util.Utils;
/** Example code to index subjects by some external content.
* Pattern 3.
*/
public class ExLucene5
{
public static void main(String[] a) throws Exception
{
System.out.println("ARQ Example: "+Utils.classShortName(ExLucene5.class)) ;
System.out.println("ARQ: "+ARQ.VERSION) ;
System.out.println() ;
Model model = ModelFactory.createDefaultModel() ;
IndexLARQ index = buildIndexExternalContent(model) ;
// Search for string
String searchString = "+document" ;
// This time, find documents with a matching DC title.
String queryString = StrUtils.strjoin("\n",
"PREFIX pf: <http://jena.hpl.hp.com/ARQ/property#>",
"SELECT ?doc {" ,
" ?doc pf:textMatch '"+searchString+"'.",
"}") ;
// Two of three docuemnts should match.
ExLucene1.performQuery(model, index, queryString) ;
index.close() ;
}
static IndexLARQ buildIndexExternalContent(Model model)
{
// ---- Create index builder
IndexBuilderNode larqBuilder = new IndexBuilderNode() ;
Resource r1 = ResourceFactory.createResource("http://example/r1") ;
Resource r2 = ResourceFactory.createResource("http://example/r2") ;
Resource r3 = ResourceFactory.createResource("http://example/r3") ;
Resource r4 = ResourceFactory.createResource("http://example/r4") ;
Literal lit1 = ResourceFactory.createPlainLiteral("doc") ;
// ---- Index based on some external content. Teh content can be any string of words.
larqBuilder.index(r1, new StringReader("document")) ; // Just to show a Stringreader is possible
larqBuilder.index(r2, "document") ;
larqBuilder.index(r3, "slideshow") ;
larqBuilder.index(r4, "codebase") ;
larqBuilder.index(lit1, "document") ;
// Note that the model is untouched - the index exists outside of any model statements.
// The application is responsible for keeping
// ----
larqBuilder.closeWriter() ;
IndexLARQ index = larqBuilder.getIndex() ;
// NodeIterator iter = index.searchModelByIndex(model, "document") ;
// for ( ; iter.hasNext() ; )
// System.out.println("Found: "+FmtUtils.stringForRDFNode((RDFNode)iter.next())) ;
return index ;
}
}