Package org.eclipse.graphiti.ui.features

Class DefaultDeleteFeature

java.lang.Object

org.eclipse.graphiti.features.impl.AbstractFeature

org.eclipse.graphiti.ui.features.DefaultDeleteFeature

All Implemented Interfaces:

IDeleteFeature, IFeature, IFeatureProviderHolder, IDelete, IDescription, IName

Direct Known Subclasses:

DeleteFeatureForPattern

public class DefaultDeleteFeature
extends AbstractFeature
implements IDeleteFeature

The Graphiti default implementation of the IDeleteFeature. It cares about removing the shape(s) representing the deleted domain object(s) from the diagram (by delegating to the IRemoveFeature provided by the IFeatureProvider. After that the EMF domain objects will be deleted using standard EMF functionality.
Before the deletion process starts the tool user will be asked if he really wants to delete; the popup appears only once for multi object deletions.

Constructor Summary

Constructors

Constructor	Description
DefaultDeleteFeature(IFeatureProvider fp)	Creates a new DefaultDeleteFeature.

Method Summary

Modifier and Type	Method	Description
boolean	canDelete(IDeleteContext context)	Can delete hook.
boolean	canExecute(IContext context)	Decides if the current feature can execute with the given context.
void	delete(IDeleteContext context)	Hook to implement the actual delete functionality.
protected void	deleteBusinessObject(java.lang.Object bo)	Standard functionality to delete one domain object.
protected void	deleteBusinessObjects(java.lang.Object[] businessObjects)	Standard functionality to delete all given domain objects.
void	execute(IContext context)	Executes the current feature with the given context.
protected java.lang.String	getDeleteName(IDeleteContext context)	Returns the delete name which will be used for the delete dialog.
java.lang.String	getDescription()	Gets the description.
java.lang.String	getName()	Hook to return the name of the delete operation e.g for display in the context menu.
protected boolean	getUserDecision(IDeleteContext context)	Shows a dialog which asks the user to confirm the deletion of one or more elements.
boolean	hasDoneChanges()	Is queried by the framework after a feature has been executed to find out if this feature should appear in the undo stack of e.g.
boolean	isDeleteAbort()	The Graphiti framework will call this method after IDelete.preDelete(IDeleteContext) has been called and before the actual delete is done.
void	postDelete(IDeleteContext context)	Post delete hook that can be implemented by users to perform any operations that need to be done after the standard delete functionality ends.
void	preDelete(IDeleteContext context)	Pre delete hook that can be implemented by users to perform any operations that need to be done before the standard delete functionality starts.
protected void	setDoneChanges(boolean doneChanges)	Can be called by users (in subclasses of DefaultDeleteFeature) to tell the framework that changes have been done that should reflect on the command stack.

Methods inherited from class org.eclipse.graphiti.features.impl.AbstractFeature

addGraphicalRepresentation, canUndo, getAllBusinessObjectsForPictogramElement, getBusinessObjectForPictogramElement, getDiagram, getDiagramBehavior, getFeatureProvider, getProgressCallback, getUserDecision, isAvailable, layoutPictogramElement, link, link, manageColor, manageColor, manageDefaultFont, manageFont, manageFont, setProgressCallback, toString, updatePictogramElement

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.graphiti.features.IFeature

canUndo, isAvailable

Methods inherited from interface org.eclipse.graphiti.features.IFeatureProviderHolder

getFeatureProvider

Constructor Detail

DefaultDeleteFeature

public DefaultDeleteFeature(IFeatureProvider fp)

Creates a new DefaultDeleteFeature.

Parameters:

fp - the feature provider

Method Detail

canDelete

public boolean canDelete(IDeleteContext context)

Description copied from interface: IDelete

Can delete hook. Needs to be implemented in order to decide if a feature can (and wants to) handle a delete request.

Specified by:

canDelete in interface IDelete

Parameters:

context - the context describing the request

Returns:

true, if the feature can perform the delete operation

delete

public void delete(IDeleteContext context)

Description copied from interface: IDelete

Hook to implement the actual delete functionality.

Specified by:

delete in interface IDelete

Parameters:

context - the context

deleteBusinessObjects

protected void deleteBusinessObjects(java.lang.Object[] businessObjects)

Standard functionality to delete all given domain objects.

Parameters:

businessObjects - the domain objects to delete

deleteBusinessObject

protected void deleteBusinessObject(java.lang.Object bo)

Standard functionality to delete one domain object. Will delegate for EObjects to EcoreUtil.delete(EObject, boolean); non-EMF objects will be ignored.

Parameters:

bo - the domain object to delete

preDelete

public void preDelete(IDeleteContext context)

Description copied from interface: IDelete

Pre delete hook that can be implemented by users to perform any operations that need to be done before the standard delete functionality starts. Be sure to call DefaultDeleteFeature#setDoneChanges(boolean) in case you modify any EMF objects to enable that the command stack gets updated.

Specified by:

preDelete in interface IDelete

Parameters:

context - the context

isDeleteAbort

public boolean isDeleteAbort()

Description copied from interface: IDelete

The Graphiti framework will call this method after IDelete.preDelete(IDeleteContext) has been called and before the actual delete is done. In case this method returns true, the operation will be cancelled by the Graphiti framework by throwing an OperationCanceledException that causes am EMF revert of the operation.

Implementing classes might e.g. set a flag in IDelete.preDelete(IDeleteContext) as cancellation indication and check that that flag here.

Specified by:

isDeleteAbort in interface IDelete

Returns:

true in case you want to cancel the current operation, false otherwise.

Since:

0.12

postDelete

public void postDelete(IDeleteContext context)

Description copied from interface: IDelete

Post delete hook that can be implemented by users to perform any operations that need to be done after the standard delete functionality ends.

Specified by:

postDelete in interface IDelete

Parameters:

context - the context

canExecute

public boolean canExecute(IContext context)

Description copied from interface: IFeature

Decides if the current feature can execute with the given context.

Specified by:

canExecute in interface IFeature

Parameters:

context - this is the general input for this method

Returns:

true if the feature can be executed, false if not

See Also:

IContext

execute

public void execute(IContext context)

Description copied from interface: IFeature

Executes the current feature with the given context.

Specified by:

execute in interface IFeature

Parameters:

context - this is the general input for this method

See Also:

IContext

getName

public java.lang.String getName()

Hook to return the name of the delete operation e.g for display in the context menu. The standard implementation simply returns "Delete".

Specified by:

getName in interface IName

Overrides:

getName in class AbstractFeature

Returns:

The diplay name of the operation

getDescription

public java.lang.String getDescription()

Description copied from interface: IDescription

Gets the description.

Specified by:

getDescription in interface IDescription

Overrides:

getDescription in class AbstractFeature

Returns:

the description

hasDoneChanges

public boolean hasDoneChanges()

Description copied from interface: IFeature

Is queried by the framework after a feature has been executed to find out if this feature should appear in the undo stack of e.g. an editor. By default all features should appear there (see implementation in AbstractFeature), but features may decide to override this behavior. Note that this is a dynamic attribute of the feature that is queried each time after the feature has been executed.

IMPORTANT NOTE: The implementor of the feature is responsible for correctly implementing this method! It might lead to inconsistencies in the command stack if this method returns false although the feature did changes.

Specified by:

hasDoneChanges in interface IFeature

Overrides:

hasDoneChanges in class AbstractFeature

Returns:

true if the feature should appear in the undo stack, false otherwise

setDoneChanges

protected void setDoneChanges(boolean doneChanges)

Can be called by users (in subclasses of DefaultDeleteFeature) to tell the framework that changes have been done that should reflect on the command stack. The method is called by the standard implementation in delete(IDeleteContext) right after the first shape has been removed from the diagram.

Parameters:

doneChanges - truein case modifications have been made, false otherwise

Since:

0.9

getUserDecision

protected boolean getUserDecision(IDeleteContext context)

Shows a dialog which asks the user to confirm the deletion of one or more elements.

Parameters:

context - delete context

Returns:

true to delete element(s); false to cancel delete

getDeleteName

protected java.lang.String getDeleteName(IDeleteContext context)

Returns the delete name which will be used for the delete dialog. E.g. "file test.java". The default implementation returns null to indicate that the popup text refers to "this object".

Parameters:

context - the delete context

Returns:

the delete name, or null to indicate no special name shall be used

Since:

0.8