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diff --git a/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/viewsupport/ViewHistory.java b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/viewsupport/ViewHistory.java
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+++ b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/viewsupport/ViewHistory.java
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+/*******************************************************************************
+ * Copyright (c) 2006, 2011 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.jdt.internal.ui.viewsupport;
+
+import java.util.List;
+
+import org.eclipse.swt.widgets.Shell;
+
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.action.IAction;
+import org.eclipse.jface.action.MenuManager;
+import org.eclipse.jface.resource.ImageDescriptor;
+
+
+/**
+ * History support for a view.
+ * 
+ * @param <E> the type of elements managed by this history
+ */
+public abstract class ViewHistory<E> {
+
+	/**
+	 * Configure the history List action.
+	 * Clients typically want to set a text and an image.
+	 *
+	 * @param action the action
+	 */
+	public abstract void configureHistoryListAction(IAction action);
+
+	/**
+	 * Configure the history drop down action.
+	 * Clients typically want to set a tooltip and an image.
+	 *
+	 * @param action the action
+	 */
+	public abstract void configureHistoryDropDownAction(IAction action);
+
+	/**
+	 * @return action to clear history entries, or <code>null</code>
+	 */
+	public abstract Action getClearAction();
+
+	public abstract String getHistoryListDialogTitle();
+
+	public abstract String getHistoryListDialogMessage();
+
+	public abstract Shell getShell();
+
+
+	/**
+	 * @return An unmodifiable list of history entries, can be empty. The list
+	 *         is sorted by age, youngest first.
+	 */
+	public abstract List<E> getHistoryEntries();
+
+	/**
+	 * @return the active entry from the history
+	 */
+	public abstract E getCurrentEntry();
+
+	/**
+	 * @param entry the entry to activate, or <code>null</code> if none should be active
+	 */
+	public abstract void setActiveEntry(E entry);
+
+	/**
+	 * @param remainingEntries all the remaining history entries, can be empty
+	 * @param activeEntry the entry to activate, or <code>null</code> if none should be active
+	 */
+	public abstract void setHistoryEntries(List<E> remainingEntries, E activeEntry);
+
+	/**
+	 * @param element the element to render
+	 * @return the image descriptor for the given element, or <code>null</code>
+	 */
+	public abstract ImageDescriptor getImageDescriptor(Object element);
+
+	/**
+	 * @param element the element to render
+	 * @return the label text for the given element
+	 */
+	public abstract String getText(E element);
+
+	/**
+	 * @return a history drop down action, ready for inclusion in a view toolbar
+	 */
+	public final IAction createHistoryDropDownAction() {
+		return new HistoryDropDownAction<E>(this);
+	}
+
+	public abstract void addMenuEntries(MenuManager manager);
+
+	public abstract String getMaxEntriesMessage();
+	public abstract int getMaxEntries();
+	public abstract void setMaxEntries(int maxEntries);
+
+}