/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Written by Doug Lea with assistance from members of JCP JSR-166

 * Expert Group and released to the public domain, as explained at

 */

package java.util.concurrent;

import java.util.*;

/**

 * A {@link ConcurrentMap} supporting {@link NavigableMap} operations,

 * and recursively so for its navigable sub-maps.

 *

 * <p>This interface is a member of the

 * <a href="{@docRoot}/../technotes/guides/collections/index.html">

 * Java Collections Framework</a>.

 *

 * @author Doug Lea

 * @param <K> the type of keys maintained by this map

 * @param <V> the type of mapped values

 * @since 1.6

 */

public interface ConcurrentNavigableMap<K,V>

    extends ConcurrentMap<K,V>, NavigableMap<K,V>

{

    /**

     * @throws ClassCastException       {@inheritDoc}

     * @throws NullPointerException     {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     */

    ConcurrentNavigableMap<K,V> subMap(K fromKey, boolean fromInclusive,

                                       K toKey,   boolean toInclusive);

    /**

     * @throws ClassCastException       {@inheritDoc}

     * @throws NullPointerException     {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     */

    ConcurrentNavigableMap<K,V> headMap(K toKey, boolean inclusive);

    /**

     * @throws ClassCastException       {@inheritDoc}

     * @throws NullPointerException     {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     */

    ConcurrentNavigableMap<K,V> tailMap(K fromKey, boolean inclusive);

    /**

     * @throws ClassCastException       {@inheritDoc}

     * @throws NullPointerException     {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     */

    ConcurrentNavigableMap<K,V> subMap(K fromKey, K toKey);

    /**

     * @throws ClassCastException       {@inheritDoc}

     * @throws NullPointerException     {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     */

    ConcurrentNavigableMap<K,V> headMap(K toKey);

    /**

     * @throws ClassCastException       {@inheritDoc}

     * @throws NullPointerException     {@inheritDoc}

     * @throws IllegalArgumentException {@inheritDoc}

     */

    ConcurrentNavigableMap<K,V> tailMap(K fromKey);

    /**

     * Returns a reverse order view of the mappings contained in this map.

     * The descending map is backed by this map, so changes to the map are

     * reflected in the descending map, and vice-versa.

     *

     * <p>The returned map has an ordering equivalent to

     * <tt>{@link Collections#reverseOrder(Comparator) Collections.reverseOrder}(comparator())</tt>.

     * The expression {@code m.descendingMap().descendingMap()} returns a

     * view of {@code m} essentially equivalent to {@code m}.

     *

     * @return a reverse order view of this map

     */

    ConcurrentNavigableMap<K,V> descendingMap();

    /**

     * Returns a {@link NavigableSet} view of the keys contained in this map.

     * The set's iterator returns the keys in ascending order.

     * The set is backed by the map, so changes to the map are

     * reflected in the set, and vice-versa.  The set supports element

     * removal, which removes the corresponding mapping from the map,

     * via the {@code Iterator.remove}, {@code Set.remove},

     * {@code removeAll}, {@code retainAll}, and {@code clear}

     * operations.  It does not support the {@code add} or {@code addAll}

     * operations.

     *

     * <p>The view's {@code iterator} is a "weakly consistent" iterator

     * that will never throw {@link ConcurrentModificationException},

     * and guarantees to traverse elements as they existed upon

     * construction of the iterator, and may (but is not guaranteed to)

     * reflect any modifications subsequent to construction.

     *

     * @return a navigable set view of the keys in this map

     */

    public NavigableSet<K> navigableKeySet();

    /**

     * Returns a {@link NavigableSet} view of the keys contained in this map.

     * The set's iterator returns the keys in ascending order.

     * The set is backed by the map, so changes to the map are

     * reflected in the set, and vice-versa.  The set supports element

     * removal, which removes the corresponding mapping from the map,

     * via the {@code Iterator.remove}, {@code Set.remove},

     * {@code removeAll}, {@code retainAll}, and {@code clear}

     * operations.  It does not support the {@code add} or {@code addAll}

     * operations.

     *

     * <p>The view's {@code iterator} is a "weakly consistent" iterator

     * that will never throw {@link ConcurrentModificationException},

     * and guarantees to traverse elements as they existed upon

     * construction of the iterator, and may (but is not guaranteed to)

     * reflect any modifications subsequent to construction.

     *

     * <p>This method is equivalent to method {@code navigableKeySet}.

     *

     * @return a navigable set view of the keys in this map

     */

    NavigableSet<K> keySet();

    /**

     * Returns a reverse order {@link NavigableSet} view of the keys contained in this map.

     * The set's iterator returns the keys in descending order.

     * The set is backed by the map, so changes to the map are

     * reflected in the set, and vice-versa.  The set supports element

     * removal, which removes the corresponding mapping from the map,

     * via the {@code Iterator.remove}, {@code Set.remove},

     * {@code removeAll}, {@code retainAll}, and {@code clear}

     * operations.  It does not support the {@code add} or {@code addAll}

     * operations.

     *

     * <p>The view's {@code iterator} is a "weakly consistent" iterator

     * that will never throw {@link ConcurrentModificationException},

     * and guarantees to traverse elements as they existed upon

     * construction of the iterator, and may (but is not guaranteed to)

     * reflect any modifications subsequent to construction.

     *

     * @return a reverse order navigable set view of the keys in this map

     */

    public NavigableSet<K> descendingKeySet();

}