AGSparqlFreetextSearch.java
package com.franz.agbase.examples;
import com.franz.agbase.*;
public class AGSparqlFreetextSearch {
/**
* Demonstrates freetext search using the fti:match predicate in SPARQL.
*
* @param args unused
* @throws AllegroGraphException
*/
public static void main(String[] args) throws AllegroGraphException {
// Connect to server, which must already be running.
AllegroGraphConnection ags = new AllegroGraphConnection();
try {
ags.enable();
} catch (Exception e) {
throw new AllegroGraphException("Server connection problem", e);
}
// Create a fresh triple store
AllegroGraph ts = ags.renew("kennedy", AGPaths.TRIPLE_STORES);
// Register any predicates whose objects are to be searched
ts.registerFreetextPredicate("<http://example.org/kennedy/first-name>");
// Load the Kennedy data
AGLoadNtriples.loadNTriplesWithTiming(ts,AGPaths.dataSources("kennedy.ntriples"));
// Index the store for querying, wait until indexing is complete.
ts.indexAllTriples(true);
// This query looks at triples involving registered freetext
// predicates for ?persons whose objects contain Arnold
String query =
"PREFIX ex: <http://example.org/kennedy/> " +
"PREFIX fti: <http://franz.com/ns/allegrograph/2.2/textindex/>" +
"SELECT ?fname ?lname " +
"WHERE { ?person fti:match 'Arnold' . " +
"?person ex:first-name ?fname . " +
"?person ex:last-name ?lname " +
"}";
// Query the store and show the results
SPARQLQuery sq = new SPARQLQuery();
sq.setTripleStore(ts);
sq.setQuery(query);
AGSparqlSelect.doSparqlSelect(sq);
//
query =
"PREFIX ex: <http://example.org/kennedy/> " +
"PREFIX fti: <http://franz.com/ns/allegrograph/2.2/textindex/>" +
"SELECT ?person1 ?person2 " +
"WHERE { ?person1 fti:match 'John' . " +
"?person2 ex:has-parent ?person1 . " +
"}";
// Query the store and show the results
sq.setQuery(query);
AGSparqlSelect.doSparqlSelect(sq);
// Close the triple store and disconnect from the server
ts.closeTripleStore();
ags.disable();
}
}
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