Equivalence.Wrapper

java.lang.Object
- com.google.common.base.Equivalence.Wrapper<T>

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

Equivalence<T>
```
public static final class Equivalence.Wrapper<T>
extends java.lang.Object
implements java.io.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

Field Summary

Fields
Modifier and Type Field Description

private Equivalence<? super T> equivalence

private T reference

private static long serialVersionUID

Constructor Summary

Constructors
Modifier Constructor Description

private Wrapper(Equivalence<? super T> equivalence, T reference)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(java.lang.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.
`java.lang.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

- Field Detail
  - equivalence
```
private final Equivalence<? super T> equivalence
```
  - reference
```
private final T reference
```
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Wrapper
```
private Wrapper(Equivalence<? super T> equivalence,
                T reference)
```
- Method Detail
  - get
```
public T get()
```
    Returns the (possibly null) reference wrapped by this instance.
  - equals
```
public boolean equals(java.lang.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 java.lang.Object
  - hashCode
```
public int hashCode()
```
    Returns the result of Equivalence.hash(Object) applied to the wrapped reference.
    
    Overrides:
    
    hashCode in class java.lang.Object
  - toString
```
public java.lang.String toString()
```
    Returns a string representation for this equivalence wrapper. The form of this string representation is not specified.
    
    Overrides:
    
    toString in class java.lang.Object