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/*

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

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

 * http://creativecommons.org/licenses/publicdomain

 */

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();

}