net.sf.basedb.util
Class ClassLocal<E>

java.lang.Object
  net.sf.basedb.util.ClassLocal<E>

public class ClassLocal<E>
extends Object

This class is a similar to the JDK ThreadLocal class, but stores one object per class instead of one object per thread.

The main usage for this class is to allow a superclass to hold one object for each subclass that is extending it.

Version:

2.0

Author:

Nicklas

Field Summary

private Map<Class,E>

objects

Constructor Summary

ClassLocal()
Create a new ClassLocal object.

Method Summary

E	get(Object instance) Get the object associated with the class of the specified instance.
protected E	initialValue(Object instance) Subclasses may override this to initialize the object stored for that class.
void	set(Object instance, E object) Store an object and associate it with the class of the specified instance.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

objects

private Map<Class,E> objects

Constructor Detail

ClassLocal

public ClassLocal()

Create a new ClassLocal object.

Method Detail

get

public E get(Object instance)

Get the object associated with the class of the specified instance.

Parameters:

instance - An object instance of the class

See Also:

ThreadLocal.get()

set

public void set(Object instance,
                E object)

Store an object and associate it with the class of the specified instance.

Parameters:

instance - An object instance of the class

object - The object to store

See Also:

ThreadLocal.set(Object)

initialValue

protected E initialValue(Object instance)

Subclasses may override this to initialize the object stored for that class.

Parameters:

instance - An object instance of the class

Returns:

The object to associate with the class