Bug 204229 [Automation][Regression]Exception is thrown when preview reportdesign in webviewer
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/document/RDSave.java
private RowSaveUtil rowSaveUtil;
	private StreamManager streamManager;	
	private RDSaveUtil rdSaveUtil;
	
	/**
	 * @param context
	 * @param queryResultID
	 * @param subQueryName
	 * @param subQueryIndex
	 * @throws DataException
	 */
	RDSave( DataEngineContext context, IBaseQueryDefinition queryDefn,
			int rowCount, QueryResultInfo queryResultInfo )
			throws DataException
	{
		this.context = context;
		this.rowCount = rowCount;
		this.queryDefn = queryDefn;
		
		this.streamManager = new StreamManager( context, queryResultInfo );
		this.rdSaveUtil = new RDSaveUtil( this.context.getMode( ),
				queryDefn,
				this.streamManager );
	}
	
	/*
	 * @see org.eclipse.birt.data.engine.impl.document.IRDSave#saveExprValue(int,
	 *      java.lang.String, java.lang.Object)
	 */