Bug 232048 [Viewers] binary incompatibility (adding public fields) reported against jface.viewers
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
* This framework method must be implemented by concrete subclasses.
	 * </p>
	 *
	 * @return the value of this cell editor
	 * @see #getValue
	 */
	protected abstract Object doGetValue();
	/**
	 * Sets the focus to the cell editor's control.
	 * <p>
	 * This framework method must be implemented by concrete subclasses.
	 * </p>
	 *
	 * @see #setFocus
	 */
	protected abstract void doSetFocus();
	/**
	 * Sets this cell editor's value.
	 * <p>
	 * This framework method must be implemented by concrete subclasses.
	 * </p>
	 *
	 * @param value
	 *            the value of this cell editor
	 * @see #setValue
	 */
	protected abstract void doSetValue(Object value);
	/**
	 * Notifies all registered cell editor listeners of an apply event. Only
	 * listeners registered at the time this method is called are notified.