oracle.toplink.essentials.internal.helper

Class IdentityHashtable

java.lang.Object

java.util.Dictionary

oracle.toplink.essentials.internal.helper.IdentityHashtable

All Implemented Interfaces:

Serializable, Cloneable

public class IdentityHashtable
extends Dictionary
implements Cloneable, Serializable

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected int	count
protected oracle.toplink.essentials.internal.helper.IdentityHashtable.Entry[]	entries
protected float	loadFactor
protected int	threshold

Constructor Summary

Constructors

Constructor and Description
IdentityHashtable() Constructs a new IdentityHashtable with a default initial capacity of 32 and a loadfactor of 0.75.
IdentityHashtable(int initialCapacity) Constructs a new IdentityHashtable with the given initial capacity and a default loadFactor of 0.75.
IdentityHashtable(int initialCapacity, float loadFactor) Constructs a new IdentityHashtable with the given initial capacity and the given loadFactor.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the mappings from this IdentityHashtable.
Object	clone() Returns a shallow copy of this IdentityHashtable (the elements are not cloned).
boolean	contains(Object obj) Returns true if this IdentityHashtable contains the given object.
boolean	containsKey(Object key) Returns true if this IdentityHashtable contains a mapping for the given key.
Enumeration	elements()
Object	get(Object key) Returns the value to which the given key is mapped in this IdentityHashtable.
boolean	isEmpty()
Enumeration	keys()
Object	put(Object key, Object obj) Associate the given object with the given key in this IdentityHashtable, replacing any existing mapping.
Object	remove(Object key) Removes the mapping (key and its corresponding value) from this IdentityHashtable, if present.
int	size()
String	toString() Return the string representation of this IdentityHashtable.

Methods inherited from class java.lang.Object

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

Field Detail

entries

protected transient oracle.toplink.essentials.internal.helper.IdentityHashtable.Entry[] entries

count

protected transient int count

threshold

protected int threshold

loadFactor

protected float loadFactor

Constructor Detail

IdentityHashtable

public IdentityHashtable(int initialCapacity,
                         float loadFactor)

Constructs a new IdentityHashtable with the given initial capacity and the given loadFactor.

Parameters:

initialCapacity - the initial capacity of this IdentityHashtable.

loadFactor - the loadFactor of the IdentityHashtable.

Throws:

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

IdentityHashtable

public IdentityHashtable(int initialCapacity)

Constructs a new IdentityHashtable with the given initial capacity and a default loadFactor of 0.75.

Parameters:

initialCapacity - the initial capacity of the IdentityHashtable.

Throws:

IllegalArgumentException - if the initial capacity is less than zero.

IdentityHashtable

public IdentityHashtable()

Constructs a new IdentityHashtable with a default initial capacity of 32 and a loadfactor of 0.75.

Method Detail

clear

public void clear()

Removes all of the mappings from this IdentityHashtable.

clone

public Object clone()

Returns a shallow copy of this IdentityHashtable (the elements are not cloned).

Overrides:

clone in class Object

Returns:

a shallow copy of this IdentityHashtable.

contains

public boolean contains(Object obj)

Returns true if this IdentityHashtable contains the given object. Equality is tested by the equals() method.

Parameters:

obj - the object to find.

Returns:

true if this IdentityHashtable contains obj.

Throws:

NullPointerException - if obj is null.

containsKey

public boolean containsKey(Object key)

Returns true if this IdentityHashtable contains a mapping for the given key. Equality is tested by reference.

Parameters:

key - object to be used as a key into this IdentityHashtable.

Returns:

true if this IdentityHashtable contains a mapping for key.

elements

public Enumeration elements()

Specified by:

elements in class Dictionary

get

public Object get(Object key)

Returns the value to which the given key is mapped in this IdentityHashtable. Returns null if this IdentityHashtable contains no mapping for this key.

Specified by:

get in class Dictionary

Parameters:

key - key whose associated value is to be returned.

Returns:

the value to which this IdentityHashtable maps the given key.

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in class Dictionary

Returns:

true if this IdentityHashtable is empty.

keys

public Enumeration keys()

Specified by:

keys in class Dictionary

put

public Object put(Object key,
                  Object obj)

Associate the given object with the given key in this IdentityHashtable, replacing any existing mapping.

Specified by:

put in class Dictionary

Parameters:

key - key to map to given object.

obj - object to be associated with key.

Returns:

the previous object for key or null if this IdentityHashtable did not have one.

Throws:

NullPointerException - if obj is null.

remove

public Object remove(Object key)

Removes the mapping (key and its corresponding value) from this IdentityHashtable, if present.

Specified by:

remove in class Dictionary

Parameters:

key - key whose mapping is to be removed from the map.

Returns:

the previous object for key or null if this IdentityHashtable did not have one.

size

public int size()

Specified by:

size in class Dictionary

Returns:

the size of this IdentityHashtable.

toString

public String toString()

Return the string representation of this IdentityHashtable.

Overrides:

toString in class Object

Returns:

the string representation of this IdentityHashtable.