Bug 192083 [regression]DataException when preview attached xtab report.[1102]
data/org.eclipse.birt.report.data.adapter/src/org/eclipse/birt/report/data/adapter/impl/DataRequestSessionImpl.java
{
	
	private DataEngine dataEngine;
	private IModelAdapter modelAdaptor;
	private DataSessionContext sessionContext;
	/**
	 * Constructs the data request session with the provided session context
	 * information.
	 * 
	 * @param context
	 * @throws BirtException
	 */
	public DataRequestSessionImpl( DataSessionContext context )
			throws BirtException
	{
		if ( context == null )
			throw new AdapterException( ResourceConstants.CONEXT_NULL_ERROR );
		dataEngine = DataEngine.newDataEngine( context.getDataEngineContext( ) );
		modelAdaptor = new ModelAdapter( context );
		sessionContext = context;
		
		
		
		
		
	}
	/*
	 * @see org.eclipse.birt.report.data.adaptor.impl.IDataRequestSession#defineDataSource(org.eclipse.birt.data.engine.api.IBaseDataSourceDesign)