| /* |
| * Copyright (c) 2011, 2012 Eike Stepper (Berlin, Germany) and others. |
| * 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: |
| * Martin Fluegge - initial API and implementation |
| * |
| */ |
| package org.eclipse.emf.cdo.dawn.examples.acore.graphiti.features; |
| |
| import org.eclipse.emf.cdo.dawn.examples.acore.AClass; |
| import org.eclipse.emf.cdo.dawn.examples.acore.graphiti.util.AcoreGraphitiContextUtil.ConnectionType; |
| |
| import org.eclipse.emf.ecore.EObject; |
| |
| import org.eclipse.graphiti.features.IFeatureProvider; |
| import org.eclipse.graphiti.features.context.ICreateConnectionContext; |
| import org.eclipse.graphiti.mm.pictograms.Anchor; |
| |
| /** |
| * @author Martin Fluegge |
| */ |
| public class AcoreCreateCompositionsFeature extends AcoreBasicCreateConnectionFeature |
| { |
| public AcoreCreateCompositionsFeature(IFeatureProvider fp) |
| { |
| // provide name and description for the UI, e.g. the palette |
| super(fp, "composition", "composition"); |
| } |
| |
| @Override |
| public boolean canCreate(ICreateConnectionContext context) |
| { |
| // return true if both anchors belong to an AClass |
| // and those AClasses are not identical |
| AClass source = getAClass(context.getSourceAnchor()); |
| AClass target = getAClass(context.getTargetAnchor()); |
| if (source != null && target != null && source != target) |
| { |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean canStartConnection(ICreateConnectionContext context) |
| { |
| if (getAClass(context.getSourceAnchor()) != null) |
| { |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Creates a EReference between two AClasses. |
| */ |
| @Override |
| protected void createConnection(EObject source, EObject target) |
| { |
| ((AClass)source).getCompositions().add((AClass)target); |
| } |
| |
| @Override |
| protected EObject getTarget(Anchor targetAnchor) |
| { |
| return getAClass(targetAnchor); |
| } |
| |
| @Override |
| protected EObject getSource(Anchor anchor) |
| { |
| return getAClass(anchor); |
| } |
| |
| @Override |
| protected ConnectionType getConnectionType() |
| { |
| return ConnectionType.COMPOSITIONS; |
| } |
| |
| /** |
| * Returns the AClass belonging to the anchor, or null if not available. |
| */ |
| private AClass getAClass(Anchor anchor) |
| { |
| if (anchor != null) |
| { |
| Object object = getBusinessObjectForPictogramElement(anchor.getParent()); |
| if (object instanceof AClass) |
| { |
| return (AClass)object; |
| } |
| } |
| return null; |
| } |
| } |