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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.graph.Node;
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.sse.Tags;
import org.apache.jena.sparql.util.NodeIsomorphismMap;

public class OpGraph extends Op1
{
    private final Node node;

    public OpGraph(Node node, Op pattern) {
        super(pattern);
        this.node = node;
    }

    public Node getNode() { return node; }

    @Override
    public String getName()                         { return Tags.tagGraph; }

    @Override
    public Op apply(Transform transform, Op op)     { return transform.transform(this, op); }
    @Override
    public void visit(OpVisitor opVisitor)          { opVisitor.visit(this); }
    @Override
    public Op1 copy(Op newOp)                        { return new OpGraph(node, newOp); }

    @Override
    public int hashCode()
    { return node.hashCode() ^ getSubOp().hashCode(); }

    @Override
    public boolean equalTo(Op other, NodeIsomorphismMap labelMap) {
        if ( !(other instanceof OpGraph) )
            return false;
        OpGraph opGraph = (OpGraph)other;
        if ( !(node.equals(opGraph.node)) )
            return false;
        return getSubOp().equalTo(opGraph.getSubOp(), labelMap);
    }
}