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

java.lang.Object
  extended by com.google.common.base.Equivalence.Wrapper<T>
All Implemented Interfaces:
Serializable
Enclosing class:
Equivalence<T>

@Beta
public static final class Equivalence.Wrapper<T>
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
See Also:
Serialized Form

Method Summary
 boolean equals(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 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 Detail

get

@Nullable
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 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


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