Bug 181061 [Viewers] JFace viewers performance issues in 3.3
A number of the JFace performance tests are red since I20060926-0800.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTableViewer.java
* 
	 * @see SWT#VIRTUAL
	 * @see SWT#SetData
	 * 
	 * @since 3.3
	 */
	protected abstract void doClear(int index);
	
		
			
	/**
	 * Selects the items at the given zero-relative indices in the receiver.
	 * The current selection is not cleared before the new items are selected.
	 * <p>
	 * If the item at a given index is not selected, it is selected.
	 * If the item at a given index was already selected, it remains selected.
	 * Indices that are out of range and duplicate indices are ignored.
	 * If the receiver is single-select and multiple indices are specified,
	 * then all indices are ignored.
	 * </p>
	 *
	 * @param indices the array of indices for the items to select
	 *
	 * @exception IllegalArgumentException - if the array of indices is null
	 * 
	 */
	protected abstract void doSelect(int[] indices);
	
}