public Command getCreateLinkCommand(View source, View target, GenCommonBase linkType) {
IElementType metamodelType = getElementType(linkType);
CreateRelationshipRequest relationShipReq = new CreateRelationshipRequest(metamodelType);
ConnectionViewAndElementDescriptor desc =
new ConnectionViewAndElementDescriptor(
new CreateElementRequestAdapter(relationShipReq),
metamodelType instanceof IHintedType
? ((IHintedType) metamodelType).getSemanticHint()
: "",
getDefaultPreferencesHint());
CreateConnectionViewAndElementRequest req = new CreateConnectionViewAndElementRequest(desc);
req.setType(RequestConstants.REQ_CONNECTION_START);
EditPart sourceEditPart = findEditPart(source);
req.setSourceEditPart(sourceEditPart);
// Note: initializes the sourceCommand in the request
Command sourceCmd = sourceEditPart.getCommand(req);
if (sourceCmd == null || !sourceCmd.canExecute()) {
return null;
}
EditPart targetEditPart = target != null ? findEditPart(target) : null;
if (targetEditPart != null) {
req.setType(RequestConstants.REQ_CONNECTION_END);
req.setTargetEditPart(targetEditPart);
req.setLocation(new Point(0, 0));
sourceEditPart.getCommand(req);
Command targetCmd = targetEditPart.getCommand(req);
return targetCmd;
}
return null;
}
/**
* return commands to transform a binary association to n-ary association or allow adding
* branches.
*
* @param createConnectionViewAndElementRequest the create connection view and element request
* @param command that will contains subcommands
* @return the command
*/
public Command getCommand(
CreateConnectionViewAndElementRequest createConnectionViewAndElementRequest,
Command command) {
// 0. get source and target type
command = new CompoundCommand();
EditPart sourceEditPart = createConnectionViewAndElementRequest.getSourceEditPart();
EditPart targetEditPart = createConnectionViewAndElementRequest.getTargetEditPart();
// if the the source or the target is a node association the goal is
// to create only one branch
if ((((View) sourceEditPart.getModel()).getType() == "" + AssociationNodeEditPart.VISUAL_ID)) {
return getBranchAssociationCommand(createConnectionViewAndElementRequest, command);
}
if ((((View) targetEditPart.getModel()).getType() == "" + AssociationNodeEditPart.VISUAL_ID)) {
return UnexecutableCommand.INSTANCE;
}
// the source or the target has to be different of a dependency branch
if (sourceEditPart instanceof AssociationBranchEditPart) {
GraphicalEditPart associationNodeEditPart =
lookForAssociationNodeEditPart((AssociationBranchEditPart) sourceEditPart);
if (associationNodeEditPart != null) {
createConnectionViewAndElementRequest.setSourceEditPart(associationNodeEditPart);
return getBranchAssociationCommand(createConnectionViewAndElementRequest, command);
} else {
return UnexecutableCommand.INSTANCE;
}
}
// the source or the target has to be different of a dependency branch
if (targetEditPart instanceof AssociationBranchEditPart) {
return UnexecutableCommand.INSTANCE;
}
// if not this a transformation of simple dependency to multiDependency
return getAssociationToMultiAssociationCommand(createConnectionViewAndElementRequest, command);
}