ClassKey

java.lang.Object
- com.fasterxml.jackson.databind.type.ClassKey

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<ClassKey>
```
public final class ClassKey
extends java.lang.Object
implements java.lang.Comparable<ClassKey>, java.io.Serializable
```
Key class, used as an efficient and accurate key for locating per-class values, such as JsonSerializers.
The reason for having a separate key class instead of directly using Class as key is mostly to allow for redefining hashCode method -- for some strange reason, Class does not redefine Object.hashCode() and thus uses identity hash, which is pretty slow. This makes key access using Class unnecessarily slow.
Note: since class is not strictly immutable, caller must know what it is doing, if changing field values.

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`private java.lang.Class<?>`	`_class`
`private java.lang.String`	`_className`
`private int`	`_hashCode`	Let's cache hash code straight away, since we are almost certain to need it.
`private static long`	`serialVersionUID`

Constructor Summary

Constructors
Constructor Description

ClassKey()

ClassKey(java.lang.Class<?> clz)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(ClassKey other)`
`boolean`	`equals(java.lang.Object o)`
`int`	`hashCode()`
`void`	`reset(java.lang.Class<?> clz)`
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - serialVersionUID
```
private static final long serialVersionUID
```
    See Also:
    
    Constant Field Values
  - _className
```
private java.lang.String _className
```
  - _class
```
private java.lang.Class<?> _class
```
  - _hashCode
```
private int _hashCode
```
    Let's cache hash code straight away, since we are almost certain to need it.
- Constructor Detail
  - ClassKey
```
public ClassKey()
```
  - ClassKey
```
public ClassKey(java.lang.Class<?> clz)
```
- Method Detail
  - reset
```
public void reset(java.lang.Class<?> clz)
```
  - compareTo
```
public int compareTo(ClassKey other)
```
    Specified by:
    
    compareTo in interface java.lang.Comparable<ClassKey>
  - equals
```
public boolean equals(java.lang.Object o)
```
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object