/*
* 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.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.sse.Tags ;
import com.hp.hpl.jena.sparql.util.NodeIsomorphismMap ;
import com.hp.hpl.jena.sparql.util.Utils ;
/** Algebra operation for a single triple. Not normally used - triples are
* contained in basic graph patterns (which is the unit of extension in SPARQL,
* and also the unit for adapting to other data store in ARQ). But for
* experimentation, it can be useful to have a convenience direct triple access.
* @see OpBGP
*/
public class OpTriple extends Op0
{
private final Triple triple ;
private OpBGP opBGP = null ;
public OpTriple(Triple triple)
{
this.triple = triple ;
}
public final Triple getTriple() { return triple ; }
public final OpBGP asBGP()
{
if ( opBGP == null )
{
BasicPattern bp = new BasicPattern() ;
bp.add(getTriple()) ;
opBGP = new OpBGP(bp) ;
}
return opBGP ;
}
@Override
public Op apply(Transform transform)
{ return transform.transform(this) ; }
@Override
public Op copy()
{
return new OpTriple(triple) ;
}
@Override
public boolean equalTo(Op other, NodeIsomorphismMap labelMap)
{
if ( ! (other instanceof OpTriple) )
return false ;
OpTriple opTriple = (OpTriple)other ;
return Utils.tripleIso(getTriple(), opTriple.getTriple(), labelMap) ;
}
@Override
public int hashCode()
{
return OpBase.HashTriple ^ triple.hashCode() ;
}
@Override
public void visit(OpVisitor opVisitor)
{ opVisitor.visit(this) ; }
@Override
public String getName()
{
return Tags.tagTriple ;
}
public boolean equivalent(OpBGP opBGP)
{
BasicPattern bgp = opBGP.getPattern() ;
if ( bgp.size() != 1 ) return false ;
Triple t = bgp.get(0) ;
return triple.equals(t) ;
}
}