cern.gp.actions.support

Class ContextAction

java.lang.Object

org.openide.util.actions.NodeAction

cern.gp.actions.support.NodeAction

cern.gp.actions.support.ContextAction

public abstract class ContextAction
extends NodeAction

An action that contains a context in a static variable.

(The implementation uses a weak reference and to help you avoid memory leaks.) Please remember that GP (NetBeans) actions are singletons, and you are not supposed to instantiate them.

Author:

Vito Baggiolini

Constructor Summary

Constructors

Constructor and Description
ContextAction()

Method Summary

Modifier and Type	Method and Description
protected void	performAction(GPNode[] activatedNodes) the action will be enabled only if the super class enables it and if the context is not null.
protected abstract void	performAction(GPNode[] activatedNodes, java.lang.Object context) A method called by GP when you invoke this action.
static void	setContext(java.lang.Object ctx) set a context object.
static java.lang.Object	unsetContext() Clear the context and return it.

Methods inherited from class cern.gp.actions.support.NodeAction

createJButton, enable, getHelpCtx, getName, iconResource, surviveFocusChange

Methods inherited from class java.lang.Object

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

Constructor Detail

ContextAction

public ContextAction()

Method Detail

setContext

public static void setContext(java.lang.Object ctx)

set a context object. Please remember that Actions are singletons, and therfore this context is shared by all places where this action is used.

Parameters:

ctx - the object containing the context

unsetContext

public static java.lang.Object unsetContext()

Clear the context and return it.

Returns:

the context set. May be null

performAction

protected final void performAction(GPNode[] activatedNodes)

the action will be enabled only if the super class enables it and if the context is not null.

Overrides:

performAction in class NodeAction

Parameters:

activatedNodes - gives array of actually activated nodes.

See Also:

protected boolean enable(Node[] nodes) { return super.enable(nodes) && (ref != null) && (ref.get() != null); }

performAction

protected abstract void performAction(GPNode[] activatedNodes,
                                      java.lang.Object context)

A method called by GP when you invoke this action. You have to implement this method with the action you want to execute. Please note that the context parameter may be null.

Parameters:

activatedNodes - the nodes currently selected

context - the object set with setContext(Object) can be null