org.drombler.commons.context

Class AbstractContext

java.lang.Object

org.drombler.commons.context.AbstractContext

All Implemented Interfaces:

Context

Direct Known Subclasses:

ProxyContext, SimpleContext

public abstract class AbstractContext
extends Object
implements Context

A base class for Context implementations.

Author:

puce

Constructor Summary

Constructors

Constructor and Description
AbstractContext()

Method Summary

Modifier and Type	Method and Description
<T> void	addContextListener(Class<T> type, ContextListener<T> listener) Registers a ContextListener for a specified type.
protected <T> void	fireContextEvent(Class<T> type) Fires a ContextEvent to each ContextListener listening for instances of type type.
protected Map<Class<?>,List<ContextListener<?>>>	getListeners() Gets all registered ContextListener.
<T> void	removeContextListener(Class<T> type, ContextListener<T> listener) Unregisters a ContextListener for a specified type.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.drombler.commons.context.Context

find, findAll

Constructor Detail

AbstractContext

public AbstractContext()

Method Detail

addContextListener

public <T> void addContextListener(Class<T> type,
                                   ContextListener<T> listener)

Registers a ContextListener for a specified type. The listener will be notified when instances of the specified type get added or removed.

Specified by:

addContextListener in interface Context

Type Parameters:

T - the specified type

Parameters:

type - the type to listen for

listener - the ContextListener

removeContextListener

public <T> void removeContextListener(Class<T> type,
                                      ContextListener<T> listener)

Unregisters a ContextListener for a specified type.

Specified by:

removeContextListener in interface Context

Type Parameters:

T - the specified type

Parameters:

type - the type to listen for

listener - the ContextListener

fireContextEvent

protected <T> void fireContextEvent(Class<T> type)

Fires a ContextEvent to each ContextListener listening for instances of type type.

Type Parameters:

T - the specified type

Parameters:

type - the type that changed

getListeners

protected final Map<Class<?>,List<ContextListener<?>>> getListeners()

Gets all registered ContextListener. Note: the type parameters of entries match.

Returns:

a Map grouping all registered ContextListener by the type of instances they are listening for.