MapBackedClassValue (Hibernate Javadocs)

java.lang.Object
- org.hibernate.internal.util.collections.MapBackedClassValue<V>

Type Parameters:

V - the type of the values stored in the Maps.

All Implemented Interfaces:

ReadOnlyMap<Class,V>
```
public final class MapBackedClassValue<V>
extends Object
implements ReadOnlyMap<Class,V>
```
For efficient lookup based on Class types as key, a ClassValue should be used; however it requires lazy association of values; this helper wraps a plain HashMap but optimises lookups via the ClassValue. N.B. there is a cost in memory and in terms of weak references, so let's use this only where proven that a simple Map lookup is otherwise too costly.

Since:

6.2

Field Summary
- Fields inherited from interface org.hibernate.internal.util.collections.ReadOnlyMap
  EMPTY

Constructor Summary

Constructors
Constructor Description

MapBackedClassValue(Map<Class<?>,V> map)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`dispose()`	Use this to wipe the backing map, important to avoid classloader leaks.
`V`	`get(Class key)`	The main operation.

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

- Constructor Detail
  - MapBackedClassValue
```
public MapBackedClassValue(Map<Class<?>,V> map)
```
- Method Detail
  - get
```
public V get(Class key)
```
    Description copied from interface: ReadOnlyMap
    
    The main operation.
    
    Specified by:
    
    get in interface ReadOnlyMap<Class,V>
    
    Returns:
    
    the corresponding object, or null if there is no association with any entry.
  - dispose
```
public void dispose()
```
    Use this to wipe the backing map, important to avoid classloader leaks.
    
    Specified by:
    
    dispose in interface ReadOnlyMap<Class,V>