/*
 * 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.graph.Node;
import org.apache.jena.sparql.util.NodeIsomorphismMap;

/** Evaluate a query element based on source information in a named collection. */

public class ElementNamedGraph extends Element {
    private Node sourceNode;
    private Element element;

    // GRAPH * (not in SPARQL)
    public ElementNamedGraph(Element el) {
        this(null, el);
    }

    // GRAPH <uri> or GRAPH ?var
    public ElementNamedGraph(Node n, Element el) {
        sourceNode = n;
        element = el;
    }

    public Node getGraphNameNode() {
        return sourceNode;
    }

    /** @return Returns the element. */
    public Element getElement() {
        return element;
    }

    @Override
    public int hashCode() {
        return element.hashCode() ^ sourceNode.hashCode();
    }

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

        if ( !(el2 instanceof ElementNamedGraph) )
            return false;
        ElementNamedGraph g2 = (ElementNamedGraph)el2;
        if ( !this.getGraphNameNode().equals(g2.getGraphNameNode()) )
            return false;
        if ( !this.getElement().equalTo(g2.getElement(), isoMap) )
            return false;
        return true;
    }

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