org.apache.jena.sparql.algebra.op.OpDistinct Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jena-arq Show documentation

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

public class OpDistinct extends OpDistinctReduced
{
    public static Op create(Op op) {
        if ( op instanceof OpDistinct )
            return op;
        return new OpDistinct(op);
    }

    public OpDistinct(Op subOp)
    { super(subOp); }

    @Override
    public Op apply(Transform transform, Op subOp)
    { return transform.transform(this, subOp); }

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

    @Override
    public void visit(OpVisitor opVisitor)  { opVisitor.visit(this); }
    @Override
    public Op1 copy(Op subOp)                { return new OpDistinct(subOp); }

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

    @Override
    public boolean equalTo(Op other, NodeIsomorphismMap labelMap) {
        if ( !(other instanceof OpDistinct) )
            return false;
        return getSubOp().equalTo(((OpDistinct)other).getSubOp(), labelMap);
    }
}