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/*
 * Copyright (c) 2015-2020, Oracle and/or its affiliates. All rights reserved.
 *
 * Licensed 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 implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.tribuo.math.la;

import java.util.Iterator;

/**
 * A {@link Comparable} {@link Iterator} over {@link VectorTuple}s.
 * 
 * The comparison is based on the indices, not on the values.
 * To use the comparator .next must have been called once.
 */
public interface VectorIterator extends Iterator, Comparable {

    /**
     * Gets the reference to the VectorTuple this iterator updates.
     * @return The VectorTuple reference.
     */
    public VectorTuple getReference();

    @Override
    public default int compareTo(VectorIterator o) {
        VectorTuple ours = getReference();
        VectorTuple other = o.getReference();
        return Integer.compare(ours.index, other.index);
    }

}