/*		 
 * Copyright (C) 2002-2014 Sebastiano Vigna 
 *
 * 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 or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. 
 */


package PACKAGE;

import VALUE_PACKAGE.VALUE_COLLECTION;

import it.unimi.dsi.fastutil.objects.ObjectSortedSet;
import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;

import java.util.Map;
import java.util.SortedMap;

#if #keys(reference)
import java.util.Comparator;
#endif

/** A type-specific {@link SortedMap}; provides some additional methods that use polymorphism to avoid (un)boxing.
 *
 * <P>Additionally, this interface strengthens {@link #entrySet()},
 * {@link #keySet()}, {@link #values()},
 * {@link #comparator()}, {@link SortedMap#subMap(Object,Object)}, {@link SortedMap#headMap(Object)} and {@link SortedMap#tailMap(Object)}.
 *
 * @see SortedMap
 */

public interface SORTED_MAP KEY_VALUE_GENERIC extends MAP KEY_VALUE_GENERIC, SortedMap<KEY_GENERIC_CLASS, VALUE_GENERIC_CLASS> {

	/** A sorted entry set providing fast iteration.
	 *
	 * <p>In some cases (e.g., hash-based classes) iteration over an entry set requires the creation
	 * of a large number of entry objects. Some <code>fastutil</code>
	 * maps might return {@linkplain #entrySet() entry set} objects of type <code>FastSortedEntrySet</code>: in this case, {@link #fastIterator() fastIterator()}
	 * will return an iterator that is guaranteed not to create a large number of objects, <em>possibly
	 * by returning always the same entry</em> (of course, mutated).
	 */
	public interface FastSortedEntrySet KEY_VALUE_GENERIC extends ObjectSortedSet<MAP.Entry KEY_VALUE_GENERIC>, FastEntrySet KEY_VALUE_GENERIC {
		/** Returns a fast iterator over this sorted entry set; the iterator might return always the same entry object, suitably mutated.
		 *
		 * @return a fast iterator over this sorted entry set; the iterator might return always the same entry object, suitably mutated.
		 */
		public ObjectBidirectionalIterator<MAP.Entry KEY_VALUE_GENERIC> fastIterator( MAP.Entry KEY_VALUE_GENERIC from );
	}

	/** Returns a sorted-set view of the mappings contained in this map.
	 *  Note that this specification strengthens the one given in the
	 *  corresponding type-specific unsorted map.
	 *
	 * @return a sorted-set view of the mappings contained in this map.
	 * @see Map#entrySet()
	 */

	ObjectSortedSet<Map.Entry<KEY_GENERIC_CLASS, VALUE_GENERIC_CLASS>> entrySet();

	/** Returns a type-specific sorted-set view of the mappings contained in this map.
	 * Note that this specification strengthens the one given in the
	 * corresponding type-specific unsorted map.
	 *
	 * @return a type-specific sorted-set view of the mappings contained in this map.
	 * @see #entrySet()
	 */

	ObjectSortedSet<MAP.Entry KEY_VALUE_GENERIC> ENTRYSET();

	/** Returns a sorted-set view of the keys contained in this map.
	 *  Note that this specification strengthens the one given in the
	 *  corresponding type-specific unsorted map.
	 *
	 * @return a sorted-set view of the keys contained in this map.
	 * @see Map#keySet()
	 */

	SORTED_SET KEY_GENERIC keySet();

	/** Returns a set view of the values contained in this map.
	 * <P>Note that this specification strengthens the one given in {@link Map#values()},
	 * which was already strengthened in the corresponding type-specific class,
	 * but was weakened by the fact that this interface extends {@link SortedMap}.
	 *
	 * @return a set view of the values contained in this map.
	 * @see Map#values()
	 */

	VALUE_COLLECTION VALUE_GENERIC values();
	/** Returns the comparator associated with this sorted set, or null if it uses its keys' natural ordering.
	 *
	 *  <P>Note that this specification strengthens the one given in {@link SortedMap#comparator()}.
	 *
	 * @see SortedMap#comparator()
	 */
	KEY_COMPARATOR KEY_SUPER_GENERIC comparator();

	/** Returns a view of the portion of this sorted map whose keys range from <code>fromKey</code>, inclusive, to <code>toKey</code>, exclusive.
	 *
	 *  <P>Note that this specification strengthens the one given in {@link SortedMap#subMap(Object,Object)}.
	 *
	 * @see SortedMap#subMap(Object,Object)
	 */
	SORTED_MAP KEY_VALUE_GENERIC subMap(KEY_GENERIC_CLASS fromKey, KEY_GENERIC_CLASS toKey);

	/** Returns a view of the portion of this sorted map whose keys are strictly less than <code>toKey</code>.
	 *
	 *  <P>Note that this specification strengthens the one given in {@link SortedMap#headMap(Object)}.
	 *
	 * @see SortedMap#headMap(Object)
	 */
	SORTED_MAP KEY_VALUE_GENERIC headMap(KEY_GENERIC_CLASS toKey);

	/** Returns a view of the portion of this sorted map whose keys are greater than or equal to <code>fromKey</code>.
	 *
	 *  <P>Note that this specification strengthens the one given in {@link SortedMap#tailMap(Object)}.
	 *
	 * @see SortedMap#tailMap(Object)
	 */
	SORTED_MAP KEY_VALUE_GENERIC tailMap(KEY_GENERIC_CLASS fromKey);

#if #keys(primitive)
	/**  Returns a view of the portion of this sorted map whose keys range from <code>fromKey</code>, inclusive, to <code>toKey</code>, exclusive.
	 * @see SortedMap#subMap(Object,Object)
	 */
	SORTED_MAP KEY_VALUE_GENERIC subMap(KEY_TYPE fromKey, KEY_TYPE toKey);

	/** Returns a view of the portion of this sorted map whose keys are strictly less than <code>toKey</code>.
	 * @see SortedMap#headMap(Object)
	 */
	SORTED_MAP KEY_VALUE_GENERIC headMap(KEY_TYPE toKey);

	/** Returns a view of the portion of this sorted map whose keys are greater than or equal to <code>fromKey</code>.
	 * @see SortedMap#tailMap(Object)
	 */
	SORTED_MAP KEY_VALUE_GENERIC tailMap(KEY_TYPE fromKey);

	/**
	 * @see SortedMap#firstKey()
	 */
	KEY_TYPE FIRST_KEY();

	/**
	 * @see SortedMap#lastKey()
	 */
	KEY_TYPE LAST_KEY();
#endif
}
