org.apache.commons.collections
クラス FastTreeMap

java.lang.Object
  |
  +--java.util.AbstractMap
        |
        +--java.util.TreeMap
              |
              +--org.apache.commons.collections.FastTreeMap

すべての実装インタフェース:

java.lang.Cloneable, java.util.Map, java.io.Serializable, java.util.SortedMap

public class FastTreeMap

extends java.util.TreeMap

A customized implementation of java.util.TreeMap designed to operate in a multithreaded environment where the large majority of method calls are read-only, instead of structural changes. When operating in "fast" mode, read calls are non-synchronized and write calls perform the following steps:

• Clone the existing collection
• Perform the modification on the clone
• Replace the existing collection with the (modified) clone

When first created, objects of this class default to "slow" mode, where all accesses of any type are synchronized but no cloning takes place. This is appropriate for initially populating the collection, followed by a switch to "fast" mode (by calling setFast(true)) after initialization is complete.

NOTE: If you are creating and accessing a TreeMap only within a single thread, you should use java.util.TreeMap directly (with no synchronization), for maximum performance.

バージョン:

$Revision: 1.4 $ $Date: 2001/05/20 21:03:30 $

作成者:

Craig R. McClanahan

関連項目:

直列化された形式

クラス java.util.Map から継承した内部クラス

java.util.Map.Entry

コンストラクタの概要

FastTreeMap()
Construct a an empty map.

FastTreeMap(java.util.Comparator comparator)
Construct an empty map with the specified comparator.

FastTreeMap(java.util.Map map)
Construct a new map with the same mappings as the specified map, sorted according to the keys's natural order

FastTreeMap(java.util.SortedMap map)
Construct a new map with the same mappings as the specified map, sorted according to the same ordering

メソッドの概要

void	clear() Remove all mappings from this map.
java.lang.Object	clone() Return a shallow copy of this FastTreeMap instance.
java.util.Comparator	comparator() Return the comparator used to order this map, or null if this map uses its keys' natural order.
boolean	containsKey(java.lang.Object key) Return true if this map contains a mapping for the specified key.
boolean	containsValue(java.lang.Object value) Return true if this map contains one or more keys mapping to the specified value.
java.util.Set	entrySet() Return a collection view of the mappings contained in this map.
boolean	equals(java.lang.Object o) Compare the specified object with this list for equality.
java.lang.Object	firstKey() Return the first (lowest) key currently in this sorted map.
java.lang.Object	get(java.lang.Object key) Return the value to which this map maps the specified key.
boolean	getFast()
int	hashCode() Return the hash code value for this map.
java.util.SortedMap	headMap(java.lang.Object key) Return a view of the portion of this map whose keys are strictly less than the specified key.
boolean	isEmpty() Test if this list has no elements.
java.util.Set	keySet() Return a set view of the keys contained in this map.
java.lang.Object	lastKey() Return the last (highest) key currently in this sorted map.
java.lang.Object	put(java.lang.Object key, java.lang.Object value) Associate the specified value with the specified key in this map.
void	putAll(java.util.Map in) Copy all of the mappings from the specified map to this one, replacing any mappings with the same keys.
java.lang.Object	remove(java.lang.Object key) Remove any mapping for this key, and return any previously mapped value.
void	setFast(boolean fast)
int	size() Return the number of key-value mappings in this map.
java.util.SortedMap	subMap(java.lang.Object fromKey, java.lang.Object toKey) Return a view of the portion of this map whose keys are in the range fromKey (inclusive) to toKey (exclusive).
java.util.SortedMap	tailMap(java.lang.Object key) Return a view of the portion of this map whose keys are greater than or equal to the specified key.
java.util.Collection	values() Return a collection view of the values contained in this map.

クラス java.util.AbstractMap から継承したメソッド

toString

クラス java.lang.Object から継承したメソッド

getClass, notify, notifyAll, wait, wait, wait

コンストラクタの詳細

FastTreeMap

public FastTreeMap()

Construct a an empty map.

FastTreeMap

public FastTreeMap(java.util.Comparator comparator)

Construct an empty map with the specified comparator.

パラメータ:

comparator - The comparator to use for ordering tree elements

FastTreeMap

public FastTreeMap(java.util.Map map)

Construct a new map with the same mappings as the specified map, sorted according to the keys's natural order

パラメータ:

map - The map whose mappings are to be copied

FastTreeMap

public FastTreeMap(java.util.SortedMap map)

Construct a new map with the same mappings as the specified map, sorted according to the same ordering

パラメータ:

map - The map whose mappings are to be copied

メソッドの詳細

clear

public void clear()

Remove all mappings from this map.

オーバーライド:

クラス java.util.TreeMap 内の clear

clone

public java.lang.Object clone()

Return a shallow copy of this FastTreeMap instance. The keys and values themselves are not copied.

オーバーライド:

クラス java.util.TreeMap 内の clone

comparator

public java.util.Comparator comparator()

Return the comparator used to order this map, or null if this map uses its keys' natural order.

オーバーライド:

クラス java.util.TreeMap 内の comparator

containsKey

public boolean containsKey(java.lang.Object key)

Return true if this map contains a mapping for the specified key.

オーバーライド:

クラス java.util.TreeMap 内の containsKey

パラメータ:

key - Key to be searched for

containsValue

public boolean containsValue(java.lang.Object value)

Return true if this map contains one or more keys mapping to the specified value.

オーバーライド:

クラス java.util.TreeMap 内の containsValue

パラメータ:

value - Value to be searched for

entrySet

public java.util.Set entrySet()

Return a collection view of the mappings contained in this map. Each element in the returned collection is a Map.Entry.

オーバーライド:

クラス java.util.TreeMap 内の entrySet

equals

public boolean equals(java.lang.Object o)

Compare the specified object with this list for equality. This implementation uses exactly the code that is used to define the list equals function in the documentation for the Map.equals method.

オーバーライド:

クラス java.util.AbstractMap 内の equals

パラメータ:

o - Object to be compared to this list

firstKey

public java.lang.Object firstKey()

Return the first (lowest) key currently in this sorted map.

オーバーライド:

クラス java.util.TreeMap 内の firstKey

get

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

Return the value to which this map maps the specified key. Returns null if the map contains no mapping for this key, or if there is a mapping with a value of null. Use the containsKey() method to disambiguate these cases.

オーバーライド:

クラス java.util.TreeMap 内の get

パラメータ:

key - Key whose value is to be returned

getFast

public boolean getFast()

hashCode

public int hashCode()

Return the hash code value for this map. This implementation uses exactly the code that is used to define the list hash function in the documentation for the Map.hashCode method.

オーバーライド:

クラス java.util.AbstractMap 内の hashCode

headMap

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

Return a view of the portion of this map whose keys are strictly less than the specified key.

オーバーライド:

クラス java.util.TreeMap 内の headMap

パラメータ:

key - Key higher than any in the returned map

isEmpty

public boolean isEmpty()

Test if this list has no elements.

オーバーライド:

クラス java.util.AbstractMap 内の isEmpty

keySet

public java.util.Set keySet()

Return a set view of the keys contained in this map.

オーバーライド:

クラス java.util.TreeMap 内の keySet

lastKey

public java.lang.Object lastKey()

Return the last (highest) key currently in this sorted map.

オーバーライド:

クラス java.util.TreeMap 内の lastKey

put

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

Associate the specified value with the specified key in this map. If the map previously contained a mapping for this key, the old value is replaced and returned.

オーバーライド:

クラス java.util.TreeMap 内の put

パラメータ:

key - The key with which the value is to be associated

value - The value to be associated with this key

putAll

public void putAll(java.util.Map in)

Copy all of the mappings from the specified map to this one, replacing any mappings with the same keys.

オーバーライド:

クラス java.util.TreeMap 内の putAll

パラメータ:

in - Map whose mappings are to be copied

remove

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

Remove any mapping for this key, and return any previously mapped value.

オーバーライド:

クラス java.util.TreeMap 内の remove

パラメータ:

key - Key whose mapping is to be removed

setFast

public void setFast(boolean fast)

size

public int size()

Return the number of key-value mappings in this map.

オーバーライド:

クラス java.util.TreeMap 内の size

subMap

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

Return a view of the portion of this map whose keys are in the range fromKey (inclusive) to toKey (exclusive).

オーバーライド:

クラス java.util.TreeMap 内の subMap

パラメータ:

fromKey - Lower limit of keys for the returned map

toKey - Upper limit of keys for the returned map

tailMap

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

Return a view of the portion of this map whose keys are greater than or equal to the specified key.

オーバーライド:

クラス java.util.TreeMap 内の tailMap

パラメータ:

key - Key less than or equal to any in the returned map

values

public java.util.Collection values()

Return a collection view of the values contained in this map.

オーバーライド:

クラス java.util.TreeMap 内の values