Bug 191637 Empty cube causes error
Comment removed as requested by the submitter - 2007-06-08 droy
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/util/DiskIndex.java
{
		return new DiskIndex( documentManager, name );
	}
	/**
	 * 
	 * @param documentManager
	 * @param name
	 * @param granularity
	 * @param keyList
	 * @throws IOException
	 * @throws DataException 
	 */
	DiskIndex( IDocumentManager documentManager, String name, int granularity,
			IDiskArray keyList, boolean isSorted ) throws IOException, DataException
	{
		this.name = name;
		this.degree = granularity;
		this.documentManager = documentManager;
		produce( keyList, isSorted );
	}
	/**
	 * 
	 * @param documentManager
	 * @param name
	 * @throws IOException
	 * @throws DataException 
	 */
	DiskIndex( IDocumentManager documentManager, String name )
			throws IOException, DataException
	{