Equivalence.Wrapper (Guava: Google Core Libraries for Java 30.1-jre API)

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 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

All Methods Instance Methods Concrete Methods
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.
`@Nullable 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 Detail
  - get
```
public @Nullable 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
    
    Parameters:
    
    obj - the reference object with which to compare.
    
    Returns:
    
    true if this object is the same as the obj argument; false otherwise.
    
    See Also:
    
    Object.hashCode(), HashMap
  - hashCode
```
public int hashCode()
```
    Returns the result of Equivalence.hash(Object) applied to the wrapped reference.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    
    a hash code value for this object.
    
    See Also:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.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
    
    Returns:
    
    a string representation of the object.