/*
* 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.graph;
import org.apache.jena.graph.impl.GraphBase ;
import org.apache.jena.mem.GraphMem ;
import org.apache.jena.util.iterator.ExtendedIterator ;
import org.apache.jena.util.iterator.NullIterator ;
/**
A factory class for creating Graphs.
*/
public class Factory
{
private Factory()
{ super(); }
/**
Answer a memory-based Graph.
*/
public static Graph createDefaultGraph()
{ return Factory.createGraphMem( ); }
public static Graph createGraphMem()
{ return new GraphMem(); }
public static Graph createGraphMemWithTransactionHandler( final TransactionHandler th )
{
Graph g = new GraphMem()
{
@Override
public TransactionHandler getTransactionHandler()
{ return th; }
};
return g;
}
private static Graph emptyGraph = new GraphBase() {
@Override
protected ExtendedIterator<Triple> graphBaseFind(Triple triplePattern) {
return NullIterator.instance() ;
}
} ;
/** Immutable graph with no triples */
public static Graph empty() { return emptyGraph ; }
}