Indirect expression file foldername

configuration-examples Indirect expression file/foldername

The following example shows how to configure a direct or indirect-expression to make a foldername, that can be used to read e.g. multiple files from a data source like the BAG.

The main difference between the configuration of the item folder_direct_expression versus folder_indirect_expression is that the calculation rule for the folder_indirect_expression is evaluated first to a direct expression, before the actual data is calculated. In the geodms-gui the resulting direct calculation rule is presented, in this case just the string: ‘20220101’.

The advantage of the indirect expression is that the then or else part of the if function does not have to be evaluated/calculated as it is not a part of the resulting direct expression anymore. This is mainly an advantage if the calculation of this part is time or memory consuming.

configuration

``` container in_direct_expressions { parameter date := '2022'; parameter isDate2022 := date == '2022';

parameter folder_direct_expression := isDate2022 ? '20220101' : '20230101'; parameter folder_indirect_expression := = isDate2022 ? '''20220101''' : '''20230101''';

unit bag_pand_direct_expression

StorageName = “= ‘D:/SourceData/BAG20/snapshots/’ + folder_direct_expression + ‘/pand.fss’” { attribute identificatie; } unit bag_pand_indirect_expression

StorageName = “= ‘D:/SourceData/BAG20/snapshots/’ + folder_indirect_expression + ‘/pand.fss’” { attribute identificatie; } }