| /****************************************************************************** |
| * Copyright (c) 2005, 2008 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| ****************************************************************************/ |
| package org.eclipse.gmf.examples.runtime.diagram.logic.internal.edithelpers; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.gmf.examples.runtime.diagram.logic.internal.commands.ReorientWireCommand; |
| import org.eclipse.gmf.examples.runtime.diagram.logic.semantic.InputTerminal; |
| import org.eclipse.gmf.examples.runtime.diagram.logic.semantic.OutputTerminal; |
| import org.eclipse.gmf.examples.runtime.diagram.logic.semantic.SemanticPackage; |
| import org.eclipse.gmf.examples.runtime.diagram.logic.semantic.Terminal; |
| import org.eclipse.gmf.runtime.common.core.command.ICommand; |
| import org.eclipse.gmf.runtime.emf.core.util.EMFCoreUtil; |
| import org.eclipse.gmf.runtime.emf.type.core.commands.GetEditContextCommand; |
| import org.eclipse.gmf.runtime.emf.type.core.requests.CreateRelationshipRequest; |
| import org.eclipse.gmf.runtime.emf.type.core.requests.GetEditContextRequest; |
| import org.eclipse.gmf.runtime.emf.type.core.requests.IEditCommandRequest; |
| import org.eclipse.gmf.runtime.emf.type.core.requests.ReorientRelationshipRequest; |
| |
| /** |
| * Edit helper for logic wire elements. |
| * |
| * @author ldamus |
| * @canBeSeenBy org.eclipse.gmf.examples.runtime.diagram.logic.* |
| */ |
| public class WireEditHelper |
| extends LogicElementEditHelper { |
| |
| /** |
| * Gets a command to determine the container for a new wire element. |
| */ |
| protected ICommand getEditContextCommand(final GetEditContextRequest req) { |
| |
| IEditCommandRequest editRequest = req.getEditCommandRequest(); |
| |
| if (editRequest instanceof CreateRelationshipRequest) { |
| final CreateRelationshipRequest createRelationshipRequest = (CreateRelationshipRequest) editRequest; |
| |
| if (hasValidSourceAndTarget(createRelationshipRequest)) { |
| |
| // Get the nearest common container element to own the new wire. |
| List<Terminal> terminals = new ArrayList<Terminal>(); |
| |
| EObject source = createRelationshipRequest.getSource(); |
| if (source != null) { |
| terminals.add((Terminal)source); |
| } |
| EObject target = createRelationshipRequest.getTarget(); |
| if (target != null) { |
| terminals.add((Terminal)target); |
| } |
| |
| EObject container = EMFCoreUtil.getLeastCommonContainer( |
| terminals, SemanticPackage.eINSTANCE.getContainerElement()); |
| |
| GetEditContextCommand result = new GetEditContextCommand(req); |
| result.setEditContext(container); |
| return result; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Checks the source and target elements in |
| * <code>createRelationshipRequest</code>. Wires can only be created from |
| * an <code>OutputTerminal</code> to and <code>InputTerminal</code>. |
| * |
| * @param createRelationshipRequest |
| * the request |
| * @return <code>true</code> if the source and target are valid, |
| * <code>false</code> otherwise. |
| */ |
| private boolean hasValidSourceAndTarget( |
| CreateRelationshipRequest createRelationshipRequest) { |
| |
| // If source is specified, it must be an output terminal. |
| EObject source = createRelationshipRequest.getSource(); |
| if (source != null && !(source instanceof OutputTerminal)) { |
| return false; |
| } |
| |
| // If target is specified, it must be an input terminal. |
| EObject target = createRelationshipRequest.getTarget(); |
| if (target != null && !(target instanceof InputTerminal)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Gets a command to change the source or target of a wire. |
| */ |
| protected ICommand getReorientRelationshipCommand( |
| ReorientRelationshipRequest req) { |
| |
| return new ReorientWireCommand(req); |
| } |
| } |