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/* 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 java.util;
/**
* NavigableMap is a SortedMap with navigation methods answering the closest
* matches for specified item.
*
* @param
* the type of key
* @param
* the type of value
* @since 1.6
*/
public interface NavigableMap extends SortedMap {
/**
* Answers the entry with the smallest key, or null if the map is empty.
*
* @return the entry with the smallest key, or null if the map is empty
*/
Map.Entry firstEntry();
/**
* Answers the entry with the biggest key, or null if the map is empty.
*
* @return the entry with the biggest key, or null if the map is empty
*/
Map.Entry lastEntry();
/**
* Deletes and answers the entry with the smallest key, or null if the map
* is empty.
*
* @return the entry with the smallest key, or null if the map is empty
*/
Map.Entry pollFirstEntry();
/**
* Deletes and answers the entry with the biggest key, or null if the map is
* empty.
*
* @return the entry with the biggest key, or null if the map is empty
*/
Map.Entry pollLastEntry();
/**
* Answers an entry related with the smallest key greater than or equal to
* the specified key, or null if no such key.
*
* @param key
* the key
* @return the entry, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
Map.Entry ceilingEntry(K key);
/**
* Answers the smallest key greater than or equal to the specified key, or
* null if no such key.
*
* @param key
* the key
* @return the smallest key greater than or equal to key, or null if no such
* key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
K ceilingKey(K key);
/**
* Answers an entry related with the smallest key greater than the specified
* key, or null if no such key.
*
* @param key
* the key
* @return the entry, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
Map.Entry higherEntry(K key);
/**
* Answers the smallest key greater than the specified key, or null if no
* such key.
*
* @param key
* the key
* @return the smallest key greater than key, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
K higherKey(K key);
/**
* Answers an entry related with the biggest key less than or equal to the
* specified key, or null if no such key.
*
* @param key
* the key
* @return the entry, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
Map.Entry floorEntry(K key);
/**
* Answers the biggest key less than or equal to the specified key, or null
* if no such key.
*
* @param key
* the key
* @return the biggest key less than or equal to key, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
K floorKey(K key);
/**
* Answers an entry related with the biggest key less than the specified
* key, or null if no such key.
*
* @param key
* the key
* @return the entry, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
Map.Entry lowerEntry(K key);
/**
* Answers the biggest key less than the specified key, or null if no such
* key.
*
* @param key
* the key
* @return the biggest key less than key, or null if no such key
* @throws ClassCastException
* if the key cannot be compared with the keys in the map
* @throws NullPointerException
* if the key is null and the map can not contain null key
*/
K lowerKey(K key);
/**
* Answers a NavigableSet view of the keys in ascending order.
*
* @return the navigable set view
*/
NavigableSet navigableKeySet();
/**
* Answers a reverse order view of the map.
*
* @return the reverse order view of the map
*/
NavigableMap descendingMap();
/**
* Answers a NavigableSet view of the keys in descending order.
*
* @return the navigable set view
*/
NavigableSet descendingKeySet();
/**
* Answers a view of part of the map whose keys is from startKey to endKey.
*
* @param startKey
* the start key
* @param startInclusive
* true if the start key is in the returned map
* @param endKey
* the end key
* @param endInclusive
* true if the end key is in the returned map
* @return the sub-map view
*
* @exception ClassCastException
* when the class of the start or end key is inappropriate
* for this SubMap
* @exception NullPointerException
* when the start or end key is null and this SortedMap does
* not support null keys
* @exception IllegalArgumentException
* when the start key is greater than the end key
*/
NavigableMap subMap(K startKey, boolean startInclusive, K endKey,
boolean endInclusive);
/**
* Answers a view of the head of the map whose keys are smaller than (or
* equal to, depends on inclusive argument) endKey.
*
* @param endKey
* the end key
* @param inclusive
* true if the end key is in the returned map
* @return the head-map view
*
* @exception ClassCastException
* when the class of the end key is inappropriate for this
* SubMap
* @exception NullPointerException
* when the end key is null and this SortedMap does not
* support null keys
* @exception IllegalArgumentException
* when the map is range-limited and end key is out of the
* range of the map
*/
NavigableMap headMap(K endKey, boolean inclusive);
/**
* Answers a view of the tail of the map whose keys are bigger than (or
* equal to, depends on inclusive argument) startKey.
*
* @param startKey
* the start key
* @param inclusive
* true if the start key is in the returned map
* @return the tail-map view
*
* @exception ClassCastException
* when the class of the start key is inappropriate for this
* SubMap
* @exception NullPointerException
* when the start key is null and this SortedMap does not
* support null keys
* @exception IllegalArgumentException
* when the map is range-limited and start key is out of the
* range of the map
*/
NavigableMap tailMap(K startKey, boolean inclusive);
}