Add methods confirmInUIThread() and askSaveDirtyTopLevelElement()

* confirmInUIThread() and askQuestionInUIThread() are synchronized now,
  since they both use a shared static variable

Issue-ref: 4264
Issue-URL: af3#4264



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/.ratings

@@ -5,7 +5,7 @@ DragAndDropUtils.java 7aab91518aa12d76533a345bf6ed0be9ac7ff0e5 GREEN
 EObjectSelectionUtils.java 128cf8f96c6b9478171dff3deda662d5934f5f44 GREEN
 HierarchicalNameViewerComparator.java 199d82e392d4e437810cc65c0fc521dab52038e0 GREEN
 KernelUIUtils.java dd58b2c618b7c847aa8cfa2d3bd9956b40b73cdd GREEN
-MessageUtilsExtended.java a08055b2f0005eebfa91662374d9ec4ce4f78aab GREEN
+MessageUtilsExtended.java 4af07e44027b71afc1909f3e21b853bccb2cbd56 YELLOW
 ObservableUtils.java 34abfd1dfaf9c0acbb31caf1f525e7b39416c116 GREEN
 PropertiesConstantUtils.java 59b1a1e4d594bb98db3aa396f2ff6474ba405920 GREEN
 SelectionUtils.java 33aec7cccccb28e5568140cf8e5443ce0f9f59f7 GREEN

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/MessageUtilsExtended.java

@@ -20,8 +20,13 @@ import static org.conqat.ide.commons.ui.dialog.MessageUtils.showError;
 import static org.conqat.ide.commons.ui.dialog.MessageUtils.showInfo;
 import static org.conqat.ide.commons.ui.dialog.MessageUtils.showWarning;
 
+import java.io.IOException;
+
 import org.conqat.ide.commons.ui.dialog.MessageUtils;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.NullProgressMonitor;
 import org.eclipse.swt.widgets.Display;
+import org.fortiss.tooling.kernel.extension.data.ITopLevelElement;
 
 /**
  * This class contains additional methods w.r.t. {@link MessageUtils}.
@@ -34,11 +39,18 @@ public class MessageUtilsExtended {
 	private static boolean tempQuestionResult;
 
 	/** Asks question in the UI thread (and block). */
-	public static boolean askQuestionInUIThread(final String title, final String message) {
+	public synchronized static boolean askQuestionInUIThread(final String title,
+			final String message) {
 		syncExec(() -> tempQuestionResult = askQuestion(title, message));
 		return tempQuestionResult;
 	}
 
+	/** Get configuration in the UI thread (and block). */
+	public synchronized static boolean confirmInUIThread(final String title, final String message) {
+		syncExec(() -> tempQuestionResult = MessageUtils.confirm(title, message));
+		return tempQuestionResult;
+	}
+
 	/** Opens a error dialog in the UI thread (and block). */
 	public static void showErrorInUIThread(final String title, final String message) {
 		syncExec(() -> showError(title, message));
@@ -58,4 +70,31 @@ public class MessageUtilsExtended {
 	private static void syncExec(Runnable runnable) {
 		Display.getDefault().syncExec(runnable);
 	}
+
+	/**
+	 * Opens a dialog to confirm if a dirty {@link ITopLevelElement} should be saved (no-op if the
+	 * {@link ITopLevelElement} is not dirty).
+	 * 
+	 * @return {@code true} if the model is not dirty (either in the first place, or not anymore
+	 *         (after successfully saving).
+	 */
+	public static boolean askSaveDirtyTopLevelElement(ITopLevelElement topelement) {
+
+		if(!topelement.isDirty()) {
+			return true;
+		}
+		if(!confirmInUIThread("Save required",
+				"For the selected action, the model may not contain unsaved changes.\n\nOK to save and continue?")) {
+			return false;
+		}
+
+		try {
+			topelement.doSave(new NullProgressMonitor());
+		} catch(CoreException | IOException e) {
+			showErrorInUIThread("Failed to save project \"" + topelement.getSaveableName(),
+					e.getMessage());
+			return false;
+		}
+		return true;
+	}
 }