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diff --git a/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/text/JavaChangeHover.java b/case-study/jdt-before/ui/org/eclipse/jdt/internal/ui/text/JavaChangeHover.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 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.text;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.widgets.Shell;
+
+import org.eclipse.core.runtime.Assert;
+
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IInformationControl;
+import org.eclipse.jface.text.IInformationControlCreator;
+import org.eclipse.jface.text.ITypedRegion;
+import org.eclipse.jface.text.TextUtilities;
+import org.eclipse.jface.text.source.ISourceViewer;
+import org.eclipse.jface.text.source.LineChangeHover;
+
+import org.eclipse.ui.editors.text.EditorsUI;
+
+/**
+ * A line change hover for Java source code. Adds a custom information control creator returning a
+ * source viewer with syntax coloring.
+ *
+ * @since 3.0
+ */
+public class JavaChangeHover extends LineChangeHover  {
+
+	/** The last computed partition type. */
+	private String fPartition;
+	/** The last created information control. */
+	private ChangeHoverInformationControl fInformationControl;
+	/** The document partitioning to be used by this hover. */
+	private String fPartitioning;
+	/** The last created information control. */
+	private int fLastScrollIndex= 0;
+
+	/**
+	 * The orientation to be used by this hover.
+	 * Allowed values are: SWT#RIGHT_TO_LEFT or SWT#LEFT_TO_RIGHT
+	 * @since 3.2
+	 */
+	private int fOrientation;
+
+	/**
+	 * Creates a new change hover for the given document partitioning.
+	 *
+	 * @param partitioning the document partitioning
+	 * @param orientation the orientation, allowed values are: SWT#RIGHT_TO_LEFT or SWT#LEFT_TO_RIGHT
+	 */
+	public JavaChangeHover(String partitioning, int orientation) {
+		Assert.isLegal(orientation == SWT.RIGHT_TO_LEFT || orientation == SWT.LEFT_TO_RIGHT);
+		fPartitioning= partitioning;
+		fOrientation= orientation;
+	}
+
+	/*
+	 * @see org.eclipse.ui.internal.editors.text.LineChangeHover#formatSource(java.lang.String)
+	 */
+	@Override
+	protected String formatSource(String content) {
+		return content;
+	}
+
+	/*
+	 * @see org.eclipse.jface.text.source.IAnnotationHoverExtension#getHoverControlCreator()
+	 */
+	@Override
+	public IInformationControlCreator getHoverControlCreator() {
+		return new IInformationControlCreator() {
+			public IInformationControl createInformationControl(Shell parent) {
+				fInformationControl= new ChangeHoverInformationControl(parent, false, fOrientation, fPartition, EditorsUI.getTooltipAffordanceString());
+				fInformationControl.setHorizontalScrollPixel(fLastScrollIndex);
+				return fInformationControl;
+			}
+		};
+	}
+
+	/*
+	 * @see org.eclipse.jface.text.information.IInformationProviderExtension2#getInformationPresenterControlCreator()
+	 * @since 3.2
+	 */
+	@Override
+	public IInformationControlCreator getInformationPresenterControlCreator() {
+		return new IInformationControlCreator() {
+			public IInformationControl createInformationControl(Shell parent) {
+				fInformationControl= new ChangeHoverInformationControl(parent, true, fOrientation, fPartition, null);
+				fInformationControl.setHorizontalScrollPixel(fLastScrollIndex);
+				return fInformationControl;
+			}
+		};
+	}
+
+	/*
+	 * @see org.eclipse.jface.text.source.LineChangeHover#computeLineRange(org.eclipse.jface.text.source.ISourceViewer, int, int, int)
+	 */
+	@Override
+	protected Point computeLineRange(ISourceViewer viewer, int line, int first, int number) {
+		Point lineRange= super.computeLineRange(viewer, line, first, number);
+		if (lineRange != null) {
+			fPartition= getPartition(viewer, lineRange.x);
+		} else {
+			fPartition= IDocument.DEFAULT_CONTENT_TYPE;
+		}
+		fLastScrollIndex= viewer.getTextWidget().getHorizontalPixel();
+		if (fInformationControl != null) {
+			fInformationControl.setStartingPartitionType(fPartition);
+			fInformationControl.setHorizontalScrollPixel(fLastScrollIndex);
+		}
+		return lineRange;
+	}
+
+	/**
+	 * Returns the partition type of the document displayed in <code>viewer</code> at <code>startLine</code>.
+
+	 * @param viewer the viewer
+	 * @param startLine the line in the viewer
+	 * @return the partition type at the start of <code>startLine</code>, or <code>IDocument.DEFAULT_CONTENT_TYPE</code> if none can be detected
+	 */
+	private String getPartition(ISourceViewer viewer, int startLine) {
+		if (viewer == null)
+			return null;
+		IDocument doc= viewer.getDocument();
+		if (doc == null)
+			return null;
+		if (startLine <= 0)
+			return IDocument.DEFAULT_CONTENT_TYPE;
+		try {
+			ITypedRegion region= TextUtilities.getPartition(doc, fPartitioning, doc.getLineOffset(startLine) - 1, true);
+			return region.getType();
+		} catch (BadLocationException e) {
+		}
+		return IDocument.DEFAULT_CONTENT_TYPE;
+	}
+
+
+	/*
+	 * @see org.eclipse.jface.text.source.LineChangeHover#getTabReplacement()
+	 */
+	@Override
+	protected String getTabReplacement() {
+		return Character.toString('\t');
+	}
+}