| //------------------------------------------------------------------------------ |
| // Copyright (c) 2005, 2007 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 implementation |
| //------------------------------------------------------------------------------ |
| package org.eclipse.epf.diagram.wpdd.providers; |
| |
| import java.lang.ref.WeakReference; |
| |
| import org.eclipse.gef.EditPart; |
| import org.eclipse.gef.EditPartFactory; |
| import org.eclipse.gmf.runtime.common.core.service.IOperation; |
| import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart; |
| import org.eclipse.gmf.runtime.diagram.ui.services.editpart.AbstractEditPartProvider; |
| import org.eclipse.gmf.runtime.diagram.ui.services.editpart.CreateGraphicEditPartOperation; |
| import org.eclipse.gmf.runtime.diagram.ui.services.editpart.IEditPartOperation; |
| import org.eclipse.gmf.runtime.notation.View; |
| import org.eclipse.epf.diagram.wpdd.edit.parts.DiagramEditPartFactory; |
| import org.eclipse.epf.diagram.wpdd.edit.parts.WorkProductDependencyDiagramEditPart; |
| |
| import org.eclipse.epf.diagram.wpdd.part.DiagramVisualIDRegistry; |
| |
| /** |
| * @generated |
| */ |
| public class DiagramEditPartProvider extends AbstractEditPartProvider { |
| |
| /** |
| * @generated |
| */ |
| private EditPartFactory factory; |
| |
| /** |
| * @generated |
| */ |
| private boolean allowCaching; |
| |
| /** |
| * @generated |
| */ |
| private WeakReference cachedPart; |
| |
| /** |
| * @generated |
| */ |
| private WeakReference cachedView; |
| |
| /** |
| * @generated |
| */ |
| public DiagramEditPartProvider() { |
| setFactory(new DiagramEditPartFactory()); |
| setAllowCaching(true); |
| } |
| |
| /** |
| * @generated |
| */ |
| public final EditPartFactory getFactory() { |
| return factory; |
| } |
| |
| /** |
| * @generated |
| */ |
| protected void setFactory(EditPartFactory factory) { |
| this.factory = factory; |
| } |
| |
| /** |
| * @generated |
| */ |
| public final boolean isAllowCaching() { |
| return allowCaching; |
| } |
| |
| /** |
| * @generated |
| */ |
| protected synchronized void setAllowCaching(boolean allowCaching) { |
| this.allowCaching = allowCaching; |
| if (!allowCaching) { |
| cachedPart = null; |
| cachedView = null; |
| } |
| } |
| |
| /** |
| * @generated |
| */ |
| protected IGraphicalEditPart createEditPart(View view) { |
| EditPart part = factory.createEditPart(null, view); |
| if (part instanceof IGraphicalEditPart) { |
| return (IGraphicalEditPart) part; |
| } |
| return null; |
| } |
| |
| /** |
| * @generated |
| */ |
| protected IGraphicalEditPart getCachedPart(View view) { |
| if (cachedView != null && cachedView.get() == view) { |
| return (IGraphicalEditPart) cachedPart.get(); |
| } |
| return null; |
| } |
| |
| /** |
| * @generated |
| */ |
| public synchronized IGraphicalEditPart createGraphicEditPart(View view) { |
| if (isAllowCaching()) { |
| IGraphicalEditPart part = getCachedPart(view); |
| cachedPart = null; |
| cachedView = null; |
| if (part != null) { |
| return part; |
| } |
| } |
| return createEditPart(view); |
| } |
| |
| /** |
| * @generated |
| */ |
| public synchronized boolean provides(IOperation operation) { |
| if (operation instanceof CreateGraphicEditPartOperation) { |
| View view = ((IEditPartOperation) operation).getView(); |
| if (!WorkProductDependencyDiagramEditPart.MODEL_ID |
| .equals(DiagramVisualIDRegistry.getModelID(view))) { |
| return false; |
| } |
| if (isAllowCaching() && getCachedPart(view) != null) { |
| return true; |
| } |
| IGraphicalEditPart part = createEditPart(view); |
| if (part != null) { |
| if (isAllowCaching()) { |
| cachedPart = new WeakReference(part); |
| cachedView = new WeakReference(view); |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| } |