Bug 214572 Implement IAggregationCellViewProvider for crosstab/chart integration
This interface implements the model logic for the designer UI, when the users design a crosstab with charts. Note that it is independent from the multi-view feature. /** * Return the name of this view */ String getViewName( ); // this should simply return "chart" /** * Returns if the given aggregation cell matches this view */ boolean matchView( AggregationCellHandle cell ); Returns true if chart is supported in this type of aggregation cell /** * Switches given aggregation cell to this view */ void switchView( AggregationCellHandle cell ); create a chart inside the aggregation cell (and remove the data elements). This method is called when the UI tries to switch the cell contents from data element to chart. /** * Restores given aggregation cell to previous view */ void restoreView( AggregationCellHandle cell );
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ReportDataServiceProvider.java
*      java.lang.String[], int, boolean)
	 */
	public IDataRowExpressionEvaluator prepareRowExpressionEvaluator( Chart cm,
			List columnExpression, int rowCount, boolean isStringType )
			throws ChartException
	{
		
		
		ClassLoader oldContextLoader = Thread.currentThread( )
				.getContextClassLoader( );
		ClassLoader parentLoader = oldContextLoader;
		if ( parentLoader == null )
			parentLoader = this.getClass( ).getClassLoader( );
		ClassLoader newContextLoader = getCustomScriptClassLoader( parentLoader );
		Thread.currentThread( ).setContextClassLoader( newContextLoader );
		try
		{
			DataRequestSession session = prepareDataRequestSession( getMaxRow( ) );
			BaseQueryHelper cbqh = new BaseQueryHelper( itemHandle, cm );
			QueryDefinition queryDefn = (QueryDefinition) cbqh.createBaseQuery( columnExpression );
			
			
			
			
			resetParametersForDataPreview( getDataSetFromHandle( ), queryDefn );
			IQueryResults actualResultSet = session.executeQuery( queryDefn,
					null,
					itemHandle.getPropertyHandle( ExtendedItemHandle.FILTER_PROP )
							.iterator( ),
					ChartReportItemUtil.getColumnDataBindings( itemHandle ) );