oracle.toplink.essentials.internal.helper

Class TopLinkIdentityHashMap

java.lang.Object

java.util.AbstractMap

oracle.toplink.essentials.internal.helper.TopLinkIdentityHashMap

All Implemented Interfaces:

Serializable, Cloneable, Map

public class TopLinkIdentityHashMap
extends AbstractMap
implements Map, Cloneable, Serializable

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
TopLinkIdentityHashMap() Constructs a new TopLinkIdentityHashMap with a default initial capacity of 32 and a loadfactor of 0.75.
TopLinkIdentityHashMap(int initialCapacity) Constructs a new TopLinkIdentityHashMap with the given initial capacity and a default loadFactor of 0.75.
TopLinkIdentityHashMap(int initialCapacity, float loadFactor) Constructs a new TopLinkIdentityHashMap with the given initial capacity and the given loadFactor.
TopLinkIdentityHashMap(Map m) Constructs a new TopLinkIdentityHashMap with the same mappings as the given map.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the mappings from this TopLinkIdentityHashMap.
Object	clone() Returns a shallow copy of this TopLinkIdentityHashMap (the elements are not cloned).
boolean	containsKey(Object key) Returns true if this TopLinkIdentityHashMap contains a mapping for the given key.
boolean	containsValue(Object obj) Returns true if this TopLinkIdentityHashMap contains the given object.
Set	entrySet() Returns a collection view of the mappings contained in this TopLinkIdentityHashMap.
Object	get(Object key) Returns the value to which the given key is mapped in this TopLinkIdentityHashMap.
boolean	isEmpty()
Set	keySet() Returns a set view of the keys contained in this TopLinkIdentityHashMap.
Object	put(Object key, Object obj) Associate the given object with the given key in this TopLinkIdentityHashMap, replacing any existing mapping.
void	putAll(Map m) Copies all of the mappings from the given map to this TopLinkIdentityHashMap, replacing any existing mappings.
Object	remove(Object key) Removes the mapping (key and its corresponding value) from this TopLinkIdentityHashMap, if present.
int	size()
Collection	values() Returns a collection view of the values contained in this TopLinkIdentityHashMap.

Methods inherited from class java.util.AbstractMap

equals, hashCode, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, equals, forEach, getOrDefault, hashCode, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

entries

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

count

protected transient int count

threshold

protected int threshold

loadFactor

protected float loadFactor

Constructor Detail

TopLinkIdentityHashMap

public TopLinkIdentityHashMap(int initialCapacity,
                              float loadFactor)

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

Parameters:

initialCapacity - the initial capacity of this TopLinkIdentityHashMap.

loadFactor - the loadFactor of the TopLinkIdentityHashMap.

Throws:

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

TopLinkIdentityHashMap

public TopLinkIdentityHashMap(int initialCapacity)

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

Parameters:

initialCapacity - the initial capacity of the TopLinkIdentityHashMap.

Throws:

IllegalArgumentException - if the initial capacity is less than zero.

TopLinkIdentityHashMap

public TopLinkIdentityHashMap()

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

TopLinkIdentityHashMap

public TopLinkIdentityHashMap(Map m)

Constructs a new TopLinkIdentityHashMap with the same mappings as the given map. The TopLinkIdentityHashMap is created with a capacity sufficient to hold the elements of the given map.

Parameters:

m - the map whose mappings are to be placed in the TopLinkIdentityHashMap.

Method Detail

size

public int size()

Specified by:

size in interface Map

Overrides:

size in class AbstractMap

Returns:

the size of this TopLinkIdentityHashMap.

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map

Overrides:

isEmpty in class AbstractMap

Returns:

true if this TopLinkIdentityHashMap is empty.

containsValue

public boolean containsValue(Object obj)

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

Specified by:

containsValue in interface Map

Overrides:

containsValue in class AbstractMap

Parameters:

obj - the object to find.

Returns:

true if this TopLinkIdentityHashMap contains obj.

Throws:

NullPointerException - if obj is null.

containsKey

public boolean containsKey(Object key)

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

Specified by:

containsKey in interface Map

Overrides:

containsKey in class AbstractMap

Parameters:

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

Returns:

true if this TopLinkIdentityHashMap contains a mapping for key.

get

public Object get(Object key)

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

Specified by:

get in interface Map

Overrides:

get in class AbstractMap

Parameters:

key - key whose associated value is to be returned.

Returns:

the value to which this TopLinkIdentityHashMap maps the given key.

put

public Object put(Object key,
                  Object obj)

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

Specified by:

put in interface Map

Overrides:

put in class AbstractMap

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 TopLinkIdentityHashMap 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 TopLinkIdentityHashMap, if present.

Specified by:

remove in interface Map

Overrides:

remove in class AbstractMap

Parameters:

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

Returns:

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

putAll

public void putAll(Map m)

Copies all of the mappings from the given map to this TopLinkIdentityHashMap, replacing any existing mappings.

Specified by:

putAll in interface Map

Overrides:

putAll in class AbstractMap

Parameters:

m - mappings to be stored in this TopLinkIdentityHashMap.

Throws:

NullPointerException - if m is null.

clear

public void clear()

Removes all of the mappings from this TopLinkIdentityHashMap.

Specified by:

clear in interface Map

Overrides:

clear in class AbstractMap

clone

public Object clone()

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

Overrides:

clone in class AbstractMap

Returns:

a shallow copy of this TopLinkIdentityHashMap.

keySet

public Set keySet()

Returns a set view of the keys contained in this TopLinkIdentityHashMap. The set is backed by the map, so changes to the map are reflected in the set, and vice versa. The set supports element removal, which removes the corresponding mapping from this map, via the Iterator.remove, Set.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.

Specified by:

keySet in interface Map

Overrides:

keySet in class AbstractMap

Returns:

a set view of the keys contained in this TopLinkIdentityHashMap.

values

public Collection values()

Returns a collection view of the values contained in this TopLinkIdentityHashMap. The collection is backed by the map, so changes to the map are reflected in the collection, and vice versa. The collection supports element removal, which removes the corresponding mapping from this map, via the Iterator.remove, Collection.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.

Specified by:

values in interface Map

Overrides:

values in class AbstractMap

Returns:

a collection view of the values contained in this TopLinkIdentityHashMap.

entrySet

public Set entrySet()

Returns a collection view of the mappings contained in this TopLinkIdentityHashMap. Each element in the returned collection is a Map.Entry. The collection is backed by the map, so changes to the map are reflected in the collection, and vice versa. The collection supports element removal, which removes the corresponding mapping from the map, via the Iterator.remove, Collection.remove, removeAll, retainAll, and clear operations. It does not support the add or addAll operations.

Specified by:

entrySet in interface Map

Specified by:

entrySet in class AbstractMap

Returns:

a collection view of the mappings contained in this TopLinkIdentityHashMap.