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ARQ is a SPARQL 1.1 query engine for Apache Jena

There is a newer version: 5.1.0

/*
 * 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.sparql.algebra.op;

import org.apache.jena.sparql.algebra.Op ;
import org.apache.jena.sparql.algebra.OpVisitor ;
import org.apache.jena.sparql.algebra.Transform ;
import org.apache.jena.sparql.core.BasicPattern ;
import org.apache.jena.sparql.sse.Tags ;
import org.apache.jena.sparql.util.NodeIsomorphismMap ;

public class OpBGP extends Op0
{
    private BasicPattern pattern ;

    public static boolean isBGP(Op op)
    {
        return (op instanceof OpBGP ) ;
    }

    public OpBGP() { this(new BasicPattern()) ; }
    
    public OpBGP(BasicPattern pattern)
    { this.pattern = pattern ; }
    
    public BasicPattern getPattern()        { return pattern ; } 
    
    @Override
    public String getName()                 { return Tags.tagBGP /*.toUpperCase(Locale.ROOT)*/ ; }
    @Override
    public Op apply(Transform transform)    { return transform.transform(this) ; } 
    @Override
    public void visit(OpVisitor opVisitor)  { opVisitor.visit(this) ; }
    @Override
    public Op0 copy()                       { return new OpBGP(pattern) ; }
    
    @Override
    public int hashCode()
    { 
        int calcHashCode = OpBase.HashBasicGraphPattern ;
        calcHashCode ^=  pattern.hashCode() ; 
        return calcHashCode ;
    }

    @Override
    public boolean equalTo(Op op2, NodeIsomorphismMap labelMap)
    {
        if ( ! ( op2 instanceof OpBGP) )
            return false ;
        
        OpBGP bgp2 = (OpBGP)op2 ;
        return pattern.equiv(bgp2.pattern, labelMap) ;
    }
}