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Eclipse Platform
Release 3.0

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org.eclipse.ui.commands
Class AbstractHandler

java.lang.Object
  org.eclipse.ui.commands.AbstractHandler

All Implemented Interfaces:

IHandler

Direct Known Subclasses:

ActionHandler

public abstract class AbstractHandler

extends Object

implements IHandler

This class is a partial implementation of IHandler. This abstract implementation provides support for handler listeners. You should subclass from this method unless you want to implement your own listener support. Subclasses should call fireHandlerChanged(HandlerEvent)when the handler changes. Subclasses should also override getAttributeValuesByName()if they have any attributes.

Since:

3.0

Constructor Summary

AbstractHandler()

Method Summary

void	addHandlerListener(IHandlerListener handlerListener) Registers an instance of IHandlerListener to listen for changes to properties of this instance.
void	dispose() The default implementation does nothing.
protected void	fireHandlerChanged(HandlerEvent handlerEvent) Fires an event to all registered listeners describing changes to this instance.
Map	getAttributeValuesByName() This simply return an empty map.
void	removeHandlerListener(IHandlerListener handlerListener) Unregisters an instance of IPropertyListener listening for changes to properties of this instance.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.ui.commands.IHandler

execute

Constructor Detail

AbstractHandler

public AbstractHandler()

Method Detail

addHandlerListener

public void addHandlerListener(IHandlerListener handlerListener)

Description copied from interface: IHandler

Registers an instance of IHandlerListener to listen for changes to properties of this instance.

Specified by:

addHandlerListener in interface IHandler

Parameters:

handlerListener - the instance to register. Must not be null. If an attempt is made to register an instance which is already registered with this instance, no operation is performed.

See Also:

IHandler.addHandlerListener(IHandlerListener)

dispose

public void dispose()

The default implementation does nothing. Subclasses who attach listeners to other objects are encouraged to detach them in this method.

Specified by:

dispose in interface IHandler

See Also:

IHandler.dispose()

fireHandlerChanged

protected void fireHandlerChanged(HandlerEvent handlerEvent)

Fires an event to all registered listeners describing changes to this instance.

Parameters:

handlerEvent - the event describing changes to this instance. Must not be null.

getAttributeValuesByName

public Map getAttributeValuesByName()

This simply return an empty map. The default implementation has no attributes.

Specified by:

getAttributeValuesByName in interface IHandler

Returns:

the map of attribute values by name. This map may be empty, but is guaranteed not to be null. If this map is not empty, its collection of keys is guaranteed to only contain instances of String.

See Also:

IHandler.getAttributeValuesByName()

removeHandlerListener

public void removeHandlerListener(IHandlerListener handlerListener)

Description copied from interface: IHandler

Unregisters an instance of IPropertyListener listening for changes to properties of this instance.

Specified by:

removeHandlerListener in interface IHandler

Parameters:

handlerListener - the instance to unregister. Must not be null. If an attempt is made to unregister an instance which is not already registered with this instance, no operation is performed.

See Also:

IHandler.removeHandlerListener(IHandlerListener)