org.hibernate.internal.util.collections
Class IdentityMap<K,V>

java.lang.Object
  org.hibernate.internal.util.collections.IdentityMap<K,V>

All Implemented Interfaces:

Map<K,V>

public final class IdentityMap<K,V>
extends Object
implements Map<K,V>

A Map where keys are compared by object identity, rather than equals().

Nested Class Summary

static class	IdentityMap.IdentityKey<K> We need to base the identity on System.identityHashCode(Object) but attempt to lazily initialize and cache this value: being a native invocation it is an expensive value to retrieve.
static class	IdentityMap.IdentityMapEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Method Summary

void	clear()
static <K,V> Map.Entry<K,V>[]	concurrentEntries(Map<K,V> map) Return the map entries (as instances of Map.Entry in a collection that is safe from concurrent modification).
boolean	containsKey(Object key)
boolean	containsValue(Object val)
Map.Entry[]	entryArray()
Set<Map.Entry<K,V>>	entrySet()
V	get(Object key)
static <K,V> IdentityMap<K,V>	instantiateSequenced(int size) Return a new instance of this class, with iteration order defined as the order in which entries were added
boolean	isEmpty()
Iterator<K>	keyIterator()
Set<K>	keySet()
V	put(K key, V value)
void	putAll(Map<? extends K,? extends V> otherMap)
V	remove(Object key)
int	size()
String	toString()
Collection<V>	values()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Map

equals, hashCode

Method Detail

instantiateSequenced

public static <K,V> IdentityMap<K,V> instantiateSequenced(int size)

Return a new instance of this class, with iteration order defined as the order in which entries were added

Parameters:

size - The size of the map to create

Returns:

The map

concurrentEntries

public static <K,V> Map.Entry<K,V>[] concurrentEntries(Map<K,V> map)

Return the map entries (as instances of Map.Entry in a collection that is safe from concurrent modification). ie. we may safely add new instances to the underlying Map during iteration of the entries().

Parameters:

map - The map of entries

Returns:

Collection

keyIterator

public Iterator<K> keyIterator()

size

public int size()

Specified by:

size in interface Map<K,V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Map<K,V>

containsValue

public boolean containsValue(Object val)

Specified by:

containsValue in interface Map<K,V>

get

public V get(Object key)

Specified by:

get in interface Map<K,V>

put

public V put(K key,
             V value)

Specified by:

put in interface Map<K,V>

remove

public V remove(Object key)

Specified by:

remove in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> otherMap)

Specified by:

putAll in interface Map<K,V>

clear

public void clear()

Specified by:

clear in interface Map<K,V>

keySet

public Set<K> keySet()

Specified by:

keySet in interface Map<K,V>

values

public Collection<V> values()

Specified by:

values in interface Map<K,V>

entrySet

public Set<Map.Entry<K,V>> entrySet()

Specified by:

entrySet in interface Map<K,V>

entryArray

public Map.Entry[] entryArray()

toString

public String toString()

Overrides:

toString in class Object