/*
 * 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.memvalue;

import java.util.Iterator;

import org.apache.jena.graph.*;

/**
 * An iterator wrapper for NodeToTriplesMap iterators which ensures that a .remove on
 * the base iterator is copied to the other two maps of this GraphMem. The current
 * triple (the most recent result of .next) is tracked by the parent
 * <code>TrackingTripleIterator</code> so that it can be removed from the other two
 * maps, which are passed in when this StoreTripleIterator is created.
 */
class StoreTripleIterator extends TrackingTripleIterator {
    protected NodeToTriplesMapBase X;
    protected NodeToTriplesMapBase A;
    protected NodeToTriplesMapBase B;
    protected Graph toNotify;

    StoreTripleIterator(Graph toNotify, Iterator<Triple> it,
                               NodeToTriplesMapBase X,
                               NodeToTriplesMapBase A,
                               NodeToTriplesMapBase B) {
        super(it);
        this.X = X;
        this.A = A;
        this.B = B;
        this.toNotify = toNotify;
    }

    @Override
    public void remove() {
        super.remove();
        X.removedOneViaIterator();
        A.remove(current);
        B.remove(current);
        toNotify.getEventManager().notifyDeleteTriple(toNotify, current);
    }
}
