Module com.aoapps.collections

Package com.aoapps.collections

Class IdentityKey<T>

java.lang.Object

com.aoapps.collections.IdentityKey<T>

public class IdentityKey<T>
extends Object

Allows any object to be used as a hash key, with identity used for hashCode() and equals(java.lang.Object). They may be used, for example, to have IdentityHashMap semantics with WeakHashMap references.

Supports null value, which may allow null keys in maps that otherwise do not support null keys.

Author:

AO Industries, Inc.

Field Summary

Fields

Modifier and Type	Field	Description
static final IdentityKey<?>	NULL

Constructor Summary

Constructors

Constructor	Description
IdentityKey(T value)	Deprecated. Please use of(java.lang.Object), which may return NULL for null values.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
T	getValue()
int	hashCode()
static <T> IdentityKey<T>	of(T value)	Gets the identity key for the given value or NULL for a null value.
static <T> IdentityKey<T>	ofNull()	Gets the identity key that represents null.
String	toString()

Methods inherited from class java.lang.Object

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

Field Details

NULL

public static final IdentityKey<?> NULL

Constructor Details

IdentityKey

@Deprecated
public IdentityKey(T value)

Deprecated.

Please use of(java.lang.Object), which may return NULL for null values.

Method Details

ofNull

public static <T> IdentityKey<T> ofNull()

Gets the identity key that represents null.

of

public static <T> IdentityKey<T> of(T value)

Gets the identity key for the given value or NULL for a null value.

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

See Also:

• System.identityHashCode(java.lang.Object)

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

getValue

public T getValue()