Class Equivalence.Wrapper<T extends @Nullable Object>

java.lang.Object

com.google.common.base.Equivalence.Wrapper<T>

All Implemented Interfaces:

Serializable

Enclosing class:

Equivalence<T>

public static final class Equivalence.Wrapper<T extends @Nullable Object>
extends Object
implements Serializable

Wraps an object so that equals(Object) and hashCode() delegate to an Equivalence.

For example, given an Equivalence for strings named equiv that tests equivalence using their lengths:

 equiv.wrap("a").equals(equiv.wrap("b")) // true
 equiv.wrap("a").equals(equiv.wrap("hello")) // false
 

Note in particular that an equivalence wrapper is never equal to the object it wraps.

 equiv.wrap(obj).equals(obj) // always false
 

Since:

10.0

Author:

Bob Lee, Ben Yu, Gregory Kick

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
boolean	equals(@Nullable Object obj)	Returns true if Equivalence.equivalent(Object, Object) applied to the wrapped references is true and both wrappers use the same equivalence.
T	get()	Returns the (possibly null) reference wrapped by this instance.
int	hashCode()	Returns the result of Equivalence.hash(Object) applied to the wrapped reference.
String	toString()	Returns a string representation for this equivalence wrapper.

Methods inherited from class java.lang.Object

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

Method Details

get

public T get()

Returns the (possibly null) reference wrapped by this instance.

equals

public boolean equals(@Nullable Object obj)

Returns true if Equivalence.equivalent(Object, Object) applied to the wrapped references is true and both wrappers use the same equivalence.

Overrides:

equals in class Object

hashCode

public int hashCode()

Returns the result of Equivalence.hash(Object) applied to the wrapped reference.

Overrides:

hashCode in class Object

toString

public String toString()

Returns a string representation for this equivalence wrapper. The form of this string representation is not specified.

Overrides:

toString in class Object