edu.emory.mathcs.backport.java.util
Class TreeMap

java.lang.Object
  java.util.AbstractMap
      edu.emory.mathcs.backport.java.util.AbstractMap
          edu.emory.mathcs.backport.java.util.TreeMap

All Implemented Interfaces:

java.util.Map, NavigableMap, java.io.Serializable, java.util.SortedMap

public class TreeMap

extends AbstractMap

implements NavigableMap, java.io.Serializable

Sorted map implementation based on a red-black tree and implementing all the methods from the NavigableMap interface.

Author:

Dawid Kurzyniec

See Also:

Serialized Form

Nested Class Summary

static class

TreeMap.Entry

Nested classes inherited from class edu.emory.mathcs.backport.java.util.AbstractMap

AbstractMap.SimpleEntry, AbstractMap.SimpleImmutableEntry

Constructor Summary

TreeMap()

TreeMap(java.util.Comparator comparator)

TreeMap(java.util.Map map)

TreeMap(java.util.SortedMap map)

Method Summary

java.util.Map.Entry	ceilingEntry(java.lang.Object key) Returns a key-value mapping associated with the least key greater than or equal to the given key, or if there is no such key.
java.lang.Object	ceilingKey(java.lang.Object key) Returns the least key greater than or equal to the given key, or if there is no such key.
void	clear()
java.lang.Object	clone()
java.util.Comparator	comparator()
boolean	containsKey(java.lang.Object key)
boolean	containsValue(java.lang.Object value)
NavigableSet	descendingKeySet() Returns a reverse order NavigableSet view of the keys contained in this map.
NavigableMap	descendingMap() Returns a reverse order view of the mappings contained in this map.
java.util.Set	entrySet()
java.util.Map.Entry	firstEntry() Returns a key-value mapping associated with the least key in this map, or if the map is empty.
java.lang.Object	firstKey()
java.util.Map.Entry	floorEntry(java.lang.Object key) Returns a key-value mapping associated with the greatest key less than or equal to the given key, or if there is no such key.
java.lang.Object	floorKey(java.lang.Object key) Returns the greatest key less than or equal to the given key, or if there is no such key.
java.lang.Object	get(java.lang.Object key)
java.util.SortedMap	headMap(java.lang.Object toKey) Equivalent to .
NavigableMap	headMap(java.lang.Object toKey, boolean toInclusive) Returns a view of the portion of this map whose keys are less than (or equal to, if is true) .
java.util.Map.Entry	higherEntry(java.lang.Object key) Returns a key-value mapping associated with the least key strictly greater than the given key, or if there is no such key.
java.lang.Object	higherKey(java.lang.Object key) Returns the least key strictly greater than the given key, or if there is no such key.
boolean	isEmpty()
java.util.Set	keySet()
java.util.Map.Entry	lastEntry() Returns a key-value mapping associated with the greatest key in this map, or if the map is empty.
java.lang.Object	lastKey()
java.util.Map.Entry	lowerEntry(java.lang.Object key) Returns a key-value mapping associated with the greatest key strictly less than the given key, or if there is no such key.
java.lang.Object	lowerKey(java.lang.Object key) Returns the greatest key strictly less than the given key, or if there is no such key.
NavigableSet	navigableKeySet() Returns a NavigableSet view of the keys contained in this map.
java.util.Map.Entry	pollFirstEntry() Removes and returns a key-value mapping associated with the least key in this map, or if the map is empty.
java.util.Map.Entry	pollLastEntry() Removes and returns a key-value mapping associated with the greatest key in this map, or if the map is empty.
java.lang.Object	put(java.lang.Object key, java.lang.Object value)
void	putAll(java.util.Map map)
java.lang.Object	remove(java.lang.Object key)
int	size()
NavigableMap	subMap(java.lang.Object fromKey, boolean fromInclusive, java.lang.Object toKey, boolean toInclusive) Returns a view of the portion of this map whose keys range from to .
java.util.SortedMap	subMap(java.lang.Object fromKey, java.lang.Object toKey) Equivalent to .
java.util.SortedMap	tailMap(java.lang.Object fromKey) Equivalent to .
NavigableMap	tailMap(java.lang.Object fromKey, boolean fromInclusive) Returns a view of the portion of this map whose keys are greater than (or equal to, if is true) .

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode, values

Constructor Detail

TreeMap

public TreeMap()

TreeMap

public TreeMap(java.util.Comparator comparator)

TreeMap

public TreeMap(java.util.SortedMap map)

TreeMap

public TreeMap(java.util.Map map)

Method Detail

size

public int size()

Specified by:

size in interface java.util.Map

clear

public void clear()

Specified by:

clear in interface java.util.Map

clone

public java.lang.Object clone()

put

public java.lang.Object put(java.lang.Object key,
                            java.lang.Object value)

Specified by:

put in interface java.util.Map

get

public java.lang.Object get(java.lang.Object key)

Specified by:

get in interface java.util.Map

containsKey

public boolean containsKey(java.lang.Object key)

Specified by:

containsKey in interface java.util.Map

entrySet

public java.util.Set entrySet()

Specified by:

entrySet in interface java.util.Map

lowerEntry

public java.util.Map.Entry lowerEntry(java.lang.Object key)

Description copied from interface: NavigableMap

Returns a key-value mapping associated with the greatest key strictly less than the given key, or if there is no such key.

Specified by:

lowerEntry in interface NavigableMap

Parameters:

key - the key

Returns:

an entry with the greatest key less than , or if there is no such key

Since:

1.6

lowerKey

public java.lang.Object lowerKey(java.lang.Object key)

Description copied from interface: NavigableMap

Returns the greatest key strictly less than the given key, or if there is no such key.

Specified by:

lowerKey in interface NavigableMap

Parameters:

key - the key

Returns:

the greatest key less than , or if there is no such key

Since:

1.6

floorEntry

public java.util.Map.Entry floorEntry(java.lang.Object key)

Description copied from interface: NavigableMap

Returns a key-value mapping associated with the greatest key less than or equal to the given key, or if there is no such key.

Specified by:

floorEntry in interface NavigableMap

Parameters:

key - the key

Returns:

an entry with the greatest key less than or equal to , or if there is no such key

Since:

1.6

floorKey

public java.lang.Object floorKey(java.lang.Object key)

Description copied from interface: NavigableMap

Returns the greatest key less than or equal to the given key, or if there is no such key.

Specified by:

floorKey in interface NavigableMap

Parameters:

key - the key

Returns:

the greatest key less than or equal to , or if there is no such key

Since:

1.6

ceilingEntry

public java.util.Map.Entry ceilingEntry(java.lang.Object key)

Description copied from interface: NavigableMap

Returns a key-value mapping associated with the least key greater than or equal to the given key, or if there is no such key.

Specified by:

ceilingEntry in interface NavigableMap

Parameters:

key - the key

Returns:

an entry with the least key greater than or equal to , or if there is no such key

Since:

1.6

ceilingKey

public java.lang.Object ceilingKey(java.lang.Object key)

Description copied from interface: NavigableMap

Returns the least key greater than or equal to the given key, or if there is no such key.

Specified by:

ceilingKey in interface NavigableMap

Parameters:

key - the key

Returns:

the least key greater than or equal to , or if there is no such key

Since:

1.6

higherEntry

public java.util.Map.Entry higherEntry(java.lang.Object key)

Description copied from interface: NavigableMap

Returns a key-value mapping associated with the least key strictly greater than the given key, or if there is no such key.

Specified by:

higherEntry in interface NavigableMap

Parameters:

key - the key

Returns:

an entry with the least key greater than , or if there is no such key

Since:

1.6

higherKey

public java.lang.Object higherKey(java.lang.Object key)

Description copied from interface: NavigableMap

Returns the least key strictly greater than the given key, or if there is no such key.

Specified by:

higherKey in interface NavigableMap

Parameters:

key - the key

Returns:

the least key greater than , or if there is no such key

Since:

1.6

firstEntry

public java.util.Map.Entry firstEntry()

Description copied from interface: NavigableMap

Returns a key-value mapping associated with the least key in this map, or if the map is empty.

Specified by:

firstEntry in interface NavigableMap

Returns:

an entry with the least key, or if this map is empty

Since:

1.6

lastEntry

public java.util.Map.Entry lastEntry()

Description copied from interface: NavigableMap

Returns a key-value mapping associated with the greatest key in this map, or if the map is empty.

Specified by:

lastEntry in interface NavigableMap

Returns:

an entry with the greatest key, or if this map is empty

Since:

1.6

pollFirstEntry

public java.util.Map.Entry pollFirstEntry()

Description copied from interface: NavigableMap

Removes and returns a key-value mapping associated with the least key in this map, or if the map is empty.

Specified by:

pollFirstEntry in interface NavigableMap

Returns:

the removed first entry of this map, or if this map is empty

Since:

1.6

pollLastEntry

public java.util.Map.Entry pollLastEntry()

Description copied from interface: NavigableMap

Removes and returns a key-value mapping associated with the greatest key in this map, or if the map is empty.

Specified by:

pollLastEntry in interface NavigableMap

Returns:

the removed last entry of this map, or if this map is empty

Since:

1.6

descendingMap

public NavigableMap descendingMap()

Description copied from interface: NavigableMap

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. If either map is modified while an iteration over a collection view of either map is in progress (except through the iterator's own operation), the results of the iteration are undefined.

The returned map has an ordering equivalent to Collections.reverseOrder(comparator()). The expression returns a view of essentially equivalent to .

Specified by:

descendingMap in interface NavigableMap

Returns:

a reverse order view of this map

Since:

1.6

descendingKeySet

public NavigableSet descendingKeySet()

Description copied from interface: NavigableMap

Returns a reverse order 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. If the map is modified while an iteration over the set is in progress (except through the iterator's own operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the , , , , and operations. It does not support the or operations.

Specified by:

descendingKeySet in interface NavigableMap

Returns:

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

subMap

public java.util.SortedMap subMap(java.lang.Object fromKey,
                                  java.lang.Object toKey)

Description copied from interface: NavigableMap

Equivalent to .

Specified by:

subMap in interface NavigableMap

headMap

public java.util.SortedMap headMap(java.lang.Object toKey)

Description copied from interface: NavigableMap

Equivalent to .

Specified by:

headMap in interface NavigableMap

tailMap

public java.util.SortedMap tailMap(java.lang.Object fromKey)

Description copied from interface: NavigableMap

Equivalent to .

Specified by:

tailMap in interface NavigableMap

subMap

public NavigableMap subMap(java.lang.Object fromKey,
                           boolean fromInclusive,
                           java.lang.Object toKey,
                           boolean toInclusive)

Description copied from interface: NavigableMap

Returns a view of the portion of this map whose keys range from to . If and are equal, the returned map is empty unless and are both true. The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.

The returned map will throw an on an attempt to insert a key outside of its range, or to construct a submap either of whose endpoints lie outside its range.

Specified by:

subMap in interface NavigableMap

Parameters:

fromKey - low endpoint of the keys in the returned map

fromInclusive - if the low endpoint is to be included in the returned view

toKey - high endpoint of the keys in the returned map

toInclusive - if the high endpoint is to be included in the returned view

Returns:

a view of the portion of this map whose keys range from to

headMap

public NavigableMap headMap(java.lang.Object toKey,
                            boolean toInclusive)

Description copied from interface: NavigableMap

Returns a view of the portion of this map whose keys are less than (or equal to, if is true) . The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.

The returned map will throw an on an attempt to insert a key outside its range.

Specified by:

headMap in interface NavigableMap

Parameters:

toKey - high endpoint of the keys in the returned map

toInclusive - if the high endpoint is to be included in the returned view

Returns:

a view of the portion of this map whose keys are less than (or equal to, if is true)

tailMap

public NavigableMap tailMap(java.lang.Object fromKey,
                            boolean fromInclusive)

Description copied from interface: NavigableMap

Returns a view of the portion of this map whose keys are greater than (or equal to, if is true) . The returned map is backed by this map, so changes in the returned map are reflected in this map, and vice-versa. The returned map supports all optional map operations that this map supports.

The returned map will throw an on an attempt to insert a key outside its range.

Specified by:

tailMap in interface NavigableMap

Parameters:

fromKey - low endpoint of the keys in the returned map

fromInclusive - if the low endpoint is to be included in the returned view

Returns:

a view of the portion of this map whose keys are greater than (or equal to, if is true)

comparator

public java.util.Comparator comparator()

Specified by:

comparator in interface java.util.SortedMap

firstKey

public java.lang.Object firstKey()

Specified by:

firstKey in interface java.util.SortedMap

lastKey

public java.lang.Object lastKey()

Specified by:

lastKey in interface java.util.SortedMap

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map

containsValue

public boolean containsValue(java.lang.Object value)

Specified by:

containsValue in interface java.util.Map

remove

public java.lang.Object remove(java.lang.Object key)

Specified by:

remove in interface java.util.Map

putAll

public void putAll(java.util.Map map)

Specified by:

putAll in interface java.util.Map

keySet

public java.util.Set keySet()

Description copied from class: AbstractMap

Specified by:

keySet in interface java.util.Map

Overrides:

keySet in class AbstractMap

navigableKeySet

public NavigableSet navigableKeySet()

Description copied from interface: NavigableMap

Returns a 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. If the map is modified while an iteration over the set is in progress (except through the iterator's own operation), the results of the iteration are undefined. The set supports element removal, which removes the corresponding mapping from the map, via the , , , , and operations. It does not support the or operations.

Specified by:

navigableKeySet in interface NavigableMap

Returns:

a navigable set view of the keys in this map