Eclipse Plug-in Developer Guide (Galileo) - EventManager (Eclipse Platform API Specification)

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Eclipse Platform
Release 3.5

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org.eclipse.core.commands.common
Class EventManager


java.lang.Object
  
org.eclipse.core.commands.common.EventManager

Direct Known Subclasses:: AbstractAction, AbstractHandler, BaseLabelProvider, ColorSelector, FrameList, HandleObject, HandleObjectManager, IntroPart, PreferenceStore, PropertySheetEntry, ResourceRegistry, ScopedPreferenceStore, State, SubActionBars, WorkbenchPart

public abstract class EventManager
extends Object
extends Object

A manager to which listeners can be attached. This handles the management of a list of listeners -- optimizing memory and performance. All the methods on this class are guaranteed to be thread-safe.

Clients may extend.

Since:: 3.2

Constructor Summary

EventManager ()


Method Summary

protected void addListenerObject ( Object listener)
          Adds a listener to this manager that will be notified when this manager's state changes.

protected void clearListeners ()
          Clears all of the listeners from the listener list.

protected Object[] getListeners ()
          Returns the listeners attached to this event manager.

protected boolean isListenerAttached ()
          Whether one or more listeners are attached to the manager.

protected void removeListenerObject ( Object listener)
          Removes a listener from this manager.

Methods inherited from class java.lang. Object

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

Constructor Detail

EventManager

public EventManager()

Method Detail

addListenerObject

protected final void addListenerObject(
Object listener)

Adds a listener to this manager that will be notified when this manager's state changes.

Parameters:: listener - The listener to be added; must not be null.

clearListeners

protected final void clearListeners()

Clears all of the listeners from the listener list.

getListeners

protected final 
Object[] getListeners()

Returns the listeners attached to this event manager.

Returns:: The listeners currently attached; may be empty, but never null

isListenerAttached

protected final boolean isListenerAttached()

Whether one or more listeners are attached to the manager.

Returns:: true if listeners are attached to the manager; false otherwise.

removeListenerObject

protected final void removeListenerObject(
Object listener)

Removes a listener from this manager.

Parameters:: listener - The listener to be removed; must not be null.