Bug 209154 Enhance Report Model to support view property
The goal of this enhancement is to support a chart view property on crosstab or table report items. The view should follow the several rules: - The view automatically shares its binding with the host item, they can't be modified. - The view can be retrieved through the API only by querying it from the host item, through a getView() method. It is not accessible directly by id - A property should be available to control whether the host or view should be displayed (default is host item). If possible, this should be controllable using report parameters. - The model should return the visibile view to the report engine to ensure that there is no impact on engine code to support this new view. - The host/view combination is a single report item with a unique id Since the chart is an extended item, the model can provide additional properties to indicate which item can be view, and which item can be a host. For 2.3, only table and crosstab can be hosts, and only chart can be a view.
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/de/internal/CrosstabReportItemTask.java
/**
	 * Gets the aggregation function for the row/column grand total in the
	 * crosstab.
	 * 
	 * @param crosstab
	 * @param axisType
	 * @param measureView
	 * @param function
	 * @return
	 * @throws SemanticException
	 */
	public void setAggregationFunction( int axisType,
			MeasureViewHandle measureView, String function )
			throws SemanticException
	{
		
		if ( crosstab == null
				|| crosstab.getGrandTotal( axisType ) == null
				|| measureView == null
				|| crosstab != measureView.getCrosstab( ) )
			return;
		CommandStack stack = crosstab.getCommandStack( );
		stack.startTrans( Messages.getString( "CrosstabReportItemTask.msg.set.aggregate.function" ) ); 
		try
		{
			for ( int j = 0; j < measureView.getAggregationCount( ); j++ )
			{
				AggregationCellHandle cell = measureView.getAggregationCell( j );
				if ( ( axisType == COLUMN_AXIS_TYPE && cell.getAggregationOnColumn( ) == null )
						|| ( axisType == ROW_AXIS_TYPE && cell.getAggregationOnRow( ) == null ) )