Package org.hibernate.internal.util.collections

Class MapBackedClassValue<V>

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

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 Details

MapBackedClassValue

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

Method Details

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>