/*

 * 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.commons.collections4;

/**

 * Defines an iterator that operates over an ordered <code>Map</code>.

 * <p>

 * This iterator allows both forward and reverse iteration through the map.

 * </p>

 *

 * @param <K> the type of the keys in the map

 * @param <V> the type of the values in the map

 * @since 3.0

 */

public interface OrderedMapIterator<K, V> extends MapIterator<K, V>, OrderedIterator<K> {

    /**

     * Checks to see if there is a previous entry that can be iterated to.

     *

     * @return <code>true</code> if the iterator has a previous element

     */

    @Override

    boolean hasPrevious();

    /**

     * Gets the previous <em>key</em> from the <code>Map</code>.

     *

     * @return the previous key in the iteration

     * @throws java.util.NoSuchElementException if the iteration is finished

     */

    @Override

    K previous();

}