org.eclipse.graphiti.features.impl

Class DefaultUpdateDiagramFeature

java.lang.Object

org.eclipse.graphiti.features.impl.AbstractFeature

org.eclipse.graphiti.features.impl.AbstractUpdateFeature

org.eclipse.graphiti.features.impl.DefaultUpdateDiagramFeature

All Implemented Interfaces:

ICustomAbortableUndoRedoFeature, ICustomUndoRedoFeature, IFeature, IFeatureProviderHolder, IUpdateFeature, IUpdate, IDescription, IName

public class DefaultUpdateDiagramFeature
extends AbstractUpdateFeature
implements ICustomAbortableUndoRedoFeature

The Class DefaultUpdateDiagramFeature. Updates the shapes directly contained in the diagram. Does not update the connections contained in the diagram, since in many cases the connections get already updated by the shapes they belong to.

Constructor Summary

Constructors

Constructor and Description
DefaultUpdateDiagramFeature(IFeatureProvider fp) Creates a new DefaultUpdateDiagramFeature.

Method Summary

Modifier and Type	Method and Description
boolean	canRedo(IContext context) Decides if the processed feature can be re-done.
boolean	canUndo(IContext context) Decides if the current feature can be undone - this is the undo of the execute operation.
boolean	canUpdate(IUpdateContext context) Checks whether the values of the current pictogram element of the given context can be updated.
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	isAbort() The Graphiti framework will call this method after ICustomUndoRedoFeature.preUndo(org.eclipse.graphiti.features.context.IContext)/ ICustomUndoRedoFeature.preRedo(org.eclipse.graphiti.features.context.IContext) have been called and before the actual undo/redo operation is triggered.
void	postRedo(IContext context) This method will be called by the Graphiti framework after the EMF undo has finished.
void	postUndo(IContext context) This method will be called by the Graphiti framework after the EMF undo is finished.
void	preRedo(IContext context) This method will be called by the Graphiti framework before the EMF undo has triggered.
void	preUndo(IContext context) This method will be called by the Graphiti framework before the EMF undo is triggered.
boolean	update(IUpdateContext context) Updates the pictogram element.
IReason	updateNeeded(IUpdateContext context) Check whether the values in the pictogram element are up to date, that means whether the graphics algorithm of this pictogram element contain the latest values from the business objects.

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

canExecute, execute, getDescription, getName

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

getFeatureProvider, isAvailable, manageFont, manageFont, setProgressCallback, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

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

isAvailable

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

getFeatureProvider

Constructor Detail

DefaultUpdateDiagramFeature

public DefaultUpdateDiagramFeature(IFeatureProvider fp)

Creates a new DefaultUpdateDiagramFeature.

Parameters:

fp - the feature provider

Method Detail

canUpdate

public boolean canUpdate(IUpdateContext context)

Description copied from interface: IUpdate

Checks whether the values of the current pictogram element of the given context can be updated.

Specified by:

canUpdate in interface IUpdate

Parameters:

context - the context

Returns:

true if update is possible

update

public boolean update(IUpdateContext context)

Description copied from interface: IUpdate

Updates the pictogram element. It copies the latest values from the business model to the graphics algorithm of this pictogram elements.

Specified by:

update in interface IUpdate

Parameters:

context - the context

Returns:

true, if update process was successfull

updateNeeded

public IReason updateNeeded(IUpdateContext context)

Description copied from interface: IUpdate

Check whether the values in the pictogram element are up to date, that means whether the graphics algorithm of this pictogram element contain the latest values from the business objects.

Specified by:

updateNeeded in interface IUpdate

Parameters:

context - the context

Returns:

true if parts of the pictogram model needs to be updated with the latest values from the business model

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

canUndo

public boolean canUndo(IContext context)

Description copied from interface: IFeature

Decides if the current feature can be undone - this is the undo of the execute operation.

Specified by:

canUndo in interface ICustomUndoRedoFeature

Specified by:

canUndo in interface IFeature

Overrides:

canUndo in class AbstractFeature

Parameters:

context - this is the general input for this method

Returns:

true if the feature can be undone, false if not

Since:

0.12

See Also:

IContext

preUndo

public void preUndo(IContext context)

Description copied from interface: ICustomUndoRedoFeature

This method will be called by the Graphiti framework before the EMF undo is triggered. Customers may revert their non-EMF changes done by the feature here or in ICustomUndoRedoFeature.postUndo(IContext).

Specified by:

preUndo in interface ICustomUndoRedoFeature

Parameters:

context - this is the instance of the IContext object that was in use when executing the feature

Since:

0.12

postUndo

public void postUndo(IContext context)

Description copied from interface: ICustomUndoRedoFeature

This method will be called by the Graphiti framework after the EMF undo is finished. Customers may revert their non-EMF changes done by the feature here or in ICustomUndoRedoFeature.preUndo(IContext).

Specified by:

postUndo in interface ICustomUndoRedoFeature

Parameters:

context - this is the instance of the IContext object that was in use when executing the feature

Since:

0.12

canRedo

public boolean canRedo(IContext context)

Description copied from interface: ICustomUndoRedoFeature

Decides if the processed feature can be re-done. This method is called once by the Graphiti framework just before any redo work is started, e.g. before ICustomUndoRedoFeature.preRedo(IContext).

Note that as soon as any feature reports false here, also all consecutive entries in the command stack are no longer reachable for redo.

Specified by:

canRedo in interface ICustomUndoRedoFeature

Parameters:

context - this is the instance of the IContext object that was in use when executing the feature

Returns:

true if the feature can be re-done, false if not

Since:

0.12

preRedo

public void preRedo(IContext context)

Description copied from interface: ICustomUndoRedoFeature

This method will be called by the Graphiti framework before the EMF undo has triggered. Customers may re-apply their non-EMF changes done by the feature here or in ICustomUndoRedoFeature.postRedo(IContext). (Usually it might be sufficient to delegate to the execution method of the feature.)

Specified by:

preRedo in interface ICustomUndoRedoFeature

Parameters:

context - this is the instance of the IContext object that was in use when executing the feature

Since:

0.12

postRedo

public void postRedo(IContext context)

Description copied from interface: ICustomUndoRedoFeature

This method will be called by the Graphiti framework after the EMF undo has finished. Customers may re-apply their non-EMF changes done by the feature here or in ICustomUndoRedoFeature.preRedo(IContext). (Usually it might be sufficient to delegate to the execution method of the feature.)

Specified by:

postRedo in interface ICustomUndoRedoFeature

Parameters:

context - this is the instance of the IContext object that was in use when executing the feature

Since:

0.12

isAbort

public boolean isAbort()

Description copied from interface: ICustomAbortableUndoRedoFeature

The Graphiti framework will call this method after ICustomUndoRedoFeature.preUndo(org.eclipse.graphiti.features.context.IContext)/ ICustomUndoRedoFeature.preRedo(org.eclipse.graphiti.features.context.IContext) have been called and before the actual undo/redo operation is triggered. 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 ICustomUndoRedoFeature.preUndo(org.eclipse.graphiti.features.context.IContext)/ ICustomUndoRedoFeature.preRedo(org.eclipse.graphiti.features.context.IContext) as cancellation indication and check that that flag here.

Specified by:

isAbort in interface ICustomAbortableUndoRedoFeature

Returns:

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

Since:

0.12