/*
* 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 com.hp.hpl.jena.sparql.algebra.op;
import com.hp.hpl.jena.graph.Node ;
import com.hp.hpl.jena.graph.Triple ;
import com.hp.hpl.jena.sparql.algebra.Op ;
import com.hp.hpl.jena.sparql.algebra.OpVisitor ;
import com.hp.hpl.jena.sparql.algebra.Transform ;
import com.hp.hpl.jena.sparql.core.BasicPattern ;
import com.hp.hpl.jena.sparql.core.Quad ;
import com.hp.hpl.jena.sparql.core.QuadPattern ;
import com.hp.hpl.jena.sparql.sse.Tags ;
import com.hp.hpl.jena.sparql.util.NodeIsomorphismMap ;
public class OpQuadPattern extends Op0
{
public static boolean isQuadPattern(Op op)
{
return (op instanceof OpQuadPattern ) ;
}
private Node graphNode ;
private BasicPattern triples ;
private QuadPattern quads = null ;
// A QuadPattern is a block of quads with the same graph arg.
// i.e. a BasicGraphPattern. This gets the blank node scoping right.
// Quads are for a specific quad store.
// Later, we may introduce OpQuadBlock for this and OpQuadPattern becomes
// a sequence of such blocks.
public OpQuadPattern(Node quadNode, BasicPattern triples)
{
this.graphNode = quadNode ;
this.triples = triples ;
}
private void initQuads()
{
if ( quads == null )
{
quads = new QuadPattern() ;
for (Triple t : triples )
quads.add(new Quad(graphNode, t)) ;
}
}
public QuadPattern getPattern()
{
initQuads() ;
return quads ;
}
public Node getGraphNode() { return graphNode ; }
public BasicPattern getBasicPattern() { return triples ; }
public boolean isEmpty() { return triples.size() == 0 ; }
/** Is this quad pattern referring to the default graph by quad transformation or explict naming? */
public boolean isDefaultGraph() { return Quad.isDefaultGraph(graphNode) ; }
/** Is this quad pattern explicitly naming the default graph? */
public boolean isExplicitDefaultGraph() { return Quad.isDefaultGraphExplicit(graphNode) ; }
/** Is this quad pattern explicitly naming the union graph? */
public boolean isUnionGraph() { return Quad.isUnionGraph(graphNode) ; }
@Override
public String getName() { return Tags.tagQuadPattern ; }
@Override
public Op apply(Transform transform) { return transform.transform(this) ; }
@Override
public void visit(OpVisitor opVisitor) { opVisitor.visit(this) ; }
@Override
public Op copy() { return new OpQuadPattern(graphNode, triples) ; }
@Override
public int hashCode()
{ return graphNode.hashCode() ^ triples.hashCode() ; }
@Override
public boolean equalTo(Op other, NodeIsomorphismMap labelMap)
{
if ( ! ( other instanceof OpQuadPattern ) ) return false ;
OpQuadPattern opQuad = (OpQuadPattern)other ;
if ( ! graphNode.equals(opQuad.graphNode) )
return false ;
return triples.equiv(opQuad.triples, labelMap) ;
}
}