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/*****************************************************************************
* Copyright (c) 2010 CEA LIST.
*
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Yann Tanguy (CEA LIST) yann.tanguy@cea.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.uml.diagram.common.handlers;
import java.util.Iterator;
import java.util.List;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.RequestConstants;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gef.requests.GroupRequest;
import org.eclipse.gmf.runtime.diagram.ui.editparts.ConnectionEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.CanonicalEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.EditPolicyRoles;
import org.eclipse.gmf.runtime.notation.View;
/**
* Command handler for delete from diagram
*/
public class DeleteFromDiagramCommandHandler extends GraphicalCommandHandler implements IHandler {
/**
*
* @see org.eclipse.papyrus.uml.diagram.common.handlers.GraphicalCommandHandler#getCommand()
*
* @return the deletion command
* @throws ExecutionException
*/
protected Command getCommand() throws ExecutionException {
// Retrieve currently selected IGraphicalEditPart(s)
List<IGraphicalEditPart> editParts = getSelectedElements();
if(editParts.isEmpty()) {
return UnexecutableCommand.INSTANCE;
}
if(!supportViews(editParts) || isCanonical(editParts)) {
return UnexecutableCommand.INSTANCE;
}
CompoundCommand command = new CompoundCommand("Delete From Diagram");
for(Iterator<IGraphicalEditPart> iter = editParts.iterator(); iter.hasNext();) {
IGraphicalEditPart editPart = iter.next();
/* Send the request to the edit part */
command.add(editPart.getCommand(new GroupRequest(RequestConstants.REQ_DELETE)));
}
return command;
}
/**
* Copied from {@link DeleteFromDiagramAction}
*/
private boolean supportViews(List<IGraphicalEditPart> editParts) {
for(Iterator<IGraphicalEditPart> iter = editParts.iterator(); iter.hasNext();) {
IGraphicalEditPart object = iter.next();
if(object instanceof GraphicalEditPart && !((GraphicalEditPart)object).hasNotationView()) {
return false;
}
}
return true;
}
/**
* Copied from {@link DeleteFromDiagramAction}
*/
protected boolean isCanonical(List<IGraphicalEditPart> editParts) {
boolean isCanonical = false;
if(!editParts.isEmpty()) {
for(Iterator<IGraphicalEditPart> si = editParts.iterator(); si.hasNext() && !isCanonical;) {
IGraphicalEditPart child = si.next();
View view = (View)child.getAdapter(View.class);
if(view == null || view.getElement() == null || view.getElement() instanceof View) {
// If there is no element or the element is a view (e.g.
// diagram
// link) than we want to support delete from diagram. See
// bugzilla#148453.
isCanonical = false;
continue;
}
if(child instanceof ConnectionEditPart) {
ConnectionEditPart connection = (ConnectionEditPart)child;
isCanonical = (!connection.isSemanticConnection() || (isCanonical(connection.getSource()) && isCanonical(connection.getTarget())));
} else {
isCanonical = isCanonical(child);
}
}
}
return isCanonical;
}
/**
* Copied from {@link DeleteFromDiagramAction}
*/
protected boolean isCanonical(EditPart ep) {
EObject eObject = (EObject)ep.getAdapter(EObject.class);
EditPart parent = ep.getParent();
if(eObject != null && parent != null) { // sanity checks
CanonicalEditPolicy cep = (CanonicalEditPolicy)parent.getEditPolicy(EditPolicyRoles.CANONICAL_ROLE);
return cep != null && cep.isEnabled() && cep.canCreate(eObject);
}
return false;
}
}
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