to.etc.util

Class IntHashMap<T>

java.lang.Object

to.etc.util.IntHashMap<T>

public final class IntHashMap<T>
extends Object

A hash map that uses primitive ints for the key rather than objects.

Note that this class is for internal optimization purposes only, and may not be supported in future releases of Apache Commons Lang. Utilities of this sort may be included in future releases of Apache Commons Collections.

Since:

2.0

Version:

$Revision: 905857 $

Author:

Apache Software Foundation, Justin Couch, Alex Chaffee (alex@apache.org)

See Also:

HashMap

Constructor Summary

Constructors

Constructor and Description
IntHashMap() Constructs a new, empty hashtable with a default capacity and load factor, which is 20 and 0.75 respectively.
IntHashMap(int initialCapacity) Constructs a new, empty hashtable with the specified initial capacity and default load factor, which is 0.75.
IntHashMap(int initialCapacity, float loadFactor) Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.

Method Summary

Modifier and Type	Method and Description
void	clear() Clears this Map so that it contains no keys.
boolean	containsKey(int key) Tests if the specified object is a key in this hashtable.
boolean	containsValue(T value) Tests if some key maps into the specified value in this hashtable.
T	get(int key) Returns the value to which the specified key is mapped in this map.
boolean	isEmpty() Tests if this hashtable maps no keys to values.
T	put(int key, T value) Maps the specified key to the specified value in this hashtable.
protected void	rehash() Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently.
T	remove(int key) Removes the key (and its corresponding value) from this map.
int	size() Returns the number of keys in this hashtable.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

IntHashMap

public IntHashMap()

Constructs a new, empty hashtable with a default capacity and load factor, which is 20 and 0.75 respectively.

IntHashMap

public IntHashMap(int initialCapacity)

Constructs a new, empty hashtable with the specified initial capacity and default load factor, which is 0.75.

Parameters:

initialCapacity - the initial capacity of the hashtable.

Throws:

IllegalArgumentException - if the initial capacity is less than zero.

IntHashMap

public IntHashMap(int initialCapacity,
                  float loadFactor)

Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.

Parameters:

initialCapacity - the initial capacity of the hashtable.

loadFactor - the load factor of the hashtable.

Throws:

IllegalArgumentException - if the initial capacity is less than zero, or if the load factor is nonpositive.

Method Detail

size

public int size()

Returns the number of keys in this hashtable.

isEmpty

public boolean isEmpty()

Tests if this hashtable maps no keys to values.

containsValue

public boolean containsValue(T value)

Tests if some key maps into the specified value in this hashtable. This operation is more expensive than the containsKey method.

containsKey

public boolean containsKey(int key)

Tests if the specified object is a key in this hashtable.

get

@Nullable
public T get(int key)

Returns the value to which the specified key is mapped in this map.

rehash

protected void rehash()

Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently.

put

@Nullable
public T put(int key,
                       T value)

Maps the specified key to the specified value in this hashtable. The key cannot be null

remove

@Nullable
public T remove(int key)

Removes the key (and its corresponding value) from this map.

clear

public void clear()

Clears this Map so that it contains no keys.