Bug 199834 Enable access to IContent object in IReportItemPresentation layer
In IReportItemPresentation layer, the extended item may want to access properties from current IContent object, for example, bookmark, content style. So we need expose the content object in this layer.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/extension/internal/RowSet.java
throw new UnsupportedOperationException( );
	}
	public Object getValue( String columnName )
	{
		throw new UnsupportedOperationException( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IRowSet#getEndingGroupLevel()
	 */
	public int getEndingGroupLevel( )
	{
		if ( rset != null )
		{
			try
			{
				return rset.getEndingGroupLevel( );
			}
			catch ( BirtException ex )
			{
				context.addException( ex );
			}
		}
		return 0;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.extension.IRowSet#getStartingGroupLevel()