/*
 * 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.syntax;

import org.apache.jena.sparql.core.DatasetGraph;
import org.apache.jena.sparql.util.NodeIsomorphismMap;

/**
 * ElementDataset - an association of an RDF Dataset (graph level version) with a
 * query pattern. Unused in parser.
 */

public class ElementDataset extends Element1 {
    // Can keep either form - but not both.
    // Helps because models have prefixes.
    private DatasetGraph dataset = null;

    public ElementDataset(DatasetGraph data, Element patternElement) {
        super(patternElement);
        this.dataset = data;
    }

    public DatasetGraph getDataset() {
        return dataset;
    }

    @Override
    public int hashCode() {
        int x = getElement().hashCode();
        if ( getDataset() != null )
            x ^= getDataset().hashCode();
        return x;
    }

    @Override
    public boolean equalTo(Element el2, NodeIsomorphismMap isoMap) {
        if ( el2 == null )
            return false;
        if ( !(el2 instanceof ElementDataset) )
            return false;
        ElementDataset blk = (ElementDataset)el2;

        if ( !getElement().equalTo(blk.getElement(), isoMap) )
            return false;

        // Dataset both null
        if ( getDataset() == null && blk.getDataset() == null )
            return true;

        if ( getDataset() != blk.getDataset() )
            return false;

        return true;
    }

    @Override
    public void visit(ElementVisitor v) { v.visit(this); }
}
