/*
 * 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
 *
 *   https://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.
 *
 *   SPDX-License-Identifier: Apache-2.0
 */

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; }
    @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);
    }
}
