com.google.common.base

## Class Equivalence.Wrapper<T>

- 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

- - ### Method Summary

    Methods
    Modifier and Type | Method and 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`

- - ### Method Detail

    - #### get

          @Nullable
          public T get()

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

    - #### equals

          public boolean equals(@Nullable
                       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`