1 files changed, 91 insertions, 0 deletions
diff --git a/plugins/infra/gmfdiag/org.eclipse.xtext.gmf.glue/src/org/eclipse/xtext/gmf/glue/concurrency/ConcurrentModificationObserver.java b/plugins/infra/gmfdiag/org.eclipse.xtext.gmf.glue/src/org/eclipse/xtext/gmf/glue/concurrency/ConcurrentModificationObserver.java
new file mode 100644
index 00000000000..5a5564cde54
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+++ b/plugins/infra/gmfdiag/org.eclipse.xtext.gmf.glue/src/org/eclipse/xtext/gmf/glue/concurrency/ConcurrentModificationObserver.java
@@ -0,0 +1,91 @@
+/*******************************************************************************
+ * Copyright (c) 2009 itemis AG (http://www.itemis.eu) 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
+ *******************************************************************************/
+package org.eclipse.xtext.gmf.glue.concurrency;
+
+import org.eclipse.emf.transaction.TransactionalEditingDomain;
+import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.ui.IEditorPart;
+import org.eclipse.ui.IEditorReference;
+import org.eclipse.ui.IPartListener;
+import org.eclipse.ui.IStartup;
+import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.IWorkbenchPart;
+import org.eclipse.ui.PlatformUI;
+
+/**
+ * Detects concurrent modifications of GMF and Xtext editors based on Xtext's dirty state management.
+ * 
+ * @author koehnlein
+ */
+public class ConcurrentModificationObserver implements IPartListener {
+
+	private EditingDomainAdapter.Factory factory;
+
+	/**
+	 * This element comes from the XText/GMF integration example, and was not originally documented.
+	 * @param activePage 
+	 */
+	public ConcurrentModificationObserver(IWorkbenchPage activePage) {
+		factory = new EditingDomainAdapter.Factory();
+		for (IEditorReference editorRef : activePage.getEditorReferences()) {
+			IEditorPart editor = editorRef.getEditor(false);
+			if (editor != null) {
+				partOpened(editor);
+			}
+		}
+	}
+
+	public void partOpened(IWorkbenchPart part) {
+		if (part instanceof DiagramEditor) {
+			TransactionalEditingDomain editingDomain = ((DiagramEditor) part).getEditingDomain();
+			factory.adapt(editingDomain, EditingDomainAdapter.class);
+		}
+	}
+
+	public void partClosed(IWorkbenchPart part) {
+		if (part instanceof DiagramEditor) {
+			// as long as bug 299920 is not fixed, we have to dispose the adapter manually
+			TransactionalEditingDomain editingDomain = ((DiagramEditor) part).getEditingDomain();
+			if (editingDomain != null) {
+				EditingDomainAdapter adapter = (EditingDomainAdapter) factory.adapt(editingDomain,
+						EditingDomainAdapter.class);
+				if (adapter != null) {
+					adapter.dispose();
+				}
+			}
+		}
+	}
+
+	public void partActivated(IWorkbenchPart part) {
+		// do nothing
+	}
+
+	public void partDeactivated(IWorkbenchPart part) {
+		// do nothing
+	}
+
+	public void partBroughtToTop(IWorkbenchPart part) {
+		// do nothing
+	}
+
+	/**
+	 * This element comes from the XText/GMF integration example, and was not originally documented.
+	 */
+	public static class Initializer implements IStartup {
+		public void earlyStartup() {
+			Display.getDefault().asyncExec(new Runnable() {
+				public void run() {
+					IWorkbenchPage activePage = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
+					activePage.addPartListener(new ConcurrentModificationObserver(activePage));
+				}
+			});
+		}
+	}
+
+}