com.generationjava.patterns.registry
Class NullRegistry

java.lang.Object
  |
  +--com.generationjava.patterns.registry.AbstractRegistry
        |
        +--com.generationjava.patterns.registry.NullRegistry

All Implemented Interfaces:

Null, Registry

public class NullRegistry

extends AbstractRegistry

implements Null

A registry which does nothing.

Field Summary

static NullRegistry

NULL_REGISTRY Singelton null registry.

Constructor Summary

NullRegistry()

Method Summary

void	clear() Clear the registry of values.
java.lang.Object	get(java.lang.Object key) Returns null.
Null	getNull() Returns null.
java.util.Iterator	keys() Get the list of known keys.
void	register(java.lang.Object key, java.lang.Object value) Registry an object under a registration key.
void	remove(java.lang.Object key) Remove a value from the registry for the specified key.
void	setNull(Null value) Set the null value which will be returned when a key is requested and is not in the registry.

Methods inherited from class com.generationjava.patterns.registry.AbstractRegistry

getRegistryFactory, setRegistryFactory

Methods inherited from class java.lang.Object

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

Field Detail

NULL_REGISTRY

public static final NullRegistry NULL_REGISTRY

Singelton null registry.

Constructor Detail

NullRegistry

public NullRegistry()

Method Detail

register

public void register(java.lang.Object key,
                     java.lang.Object value)

Description copied from interface: Registry

Registry an object under a registration key.

Specified by:

register in interface Registry

Parameters:

key - Object registration key

value - Object to register

get

public java.lang.Object get(java.lang.Object key)

Returns null.

Specified by:

get in interface Registry

clear

public void clear()

Description copied from interface: Registry

Clear the registry of values.

Specified by:

clear in interface Registry

remove

public void remove(java.lang.Object key)

Description copied from interface: Registry

Remove a value from the registry for the specified key.

Specified by:

remove in interface Registry

keys

public java.util.Iterator keys()

Description copied from interface: Registry

Get the list of known keys.

Specified by:

keys in interface Registry

setNull

public void setNull(Null value)

Description copied from interface: Registry

Set the null value which will be returned when a key is requested and is not in the registry.

Specified by:

setNull in interface Registry

Overrides:

setNull in class AbstractRegistry

getNull

public Null getNull()

Returns null.

Specified by:

getNull in interface Registry

Overrides:

getNull in class AbstractRegistry