Handling Errors

This task explains how to handle features that are in error. In the scenario described below, you are going to open a .CATPart file that is made up of 2 lines and a datum point. This point will be the intersection of the lines if they intersect, or the origin if they do not. To do so, you are going to create a rule.

The use of geometrical operators to value geometry in relations may lead to update errors in the created features. If you value a datum point with the result of the intersection of 2 lines, these 2 lines may not intersect and the point is therefore in error.

Do not catch evaluation errors which is available by selecting the relation in the specification tree and selecting the Properties command enables you:

To create features in error
To know (through an error message) if a feature is in error and
To make changes (or not) in case of errors.

Note that this error handling is only available for GSD features.

Open the KwrErrorHandling.CATPart file.
From the Start > Knowledgeware menu, access the Knowledge Advisor workbench.
Click the Rule icon () to create a rule that will react to the fact that the datum point is the intersection of the 2 lines if they intersect or the origin if they do not.

In the Rule Editor, enter the following body:

let x(Point)

             x =intersect(`Geometrical Set.1\Line.1` 
             ,`Geometrical Set.1\Line.2` 
             )

             if (x.Error==true)

             `Geometrical Set.1\Point.5` 
             = point(0mm,0mm,0mm)

             else 

             `Geometrical Set.1\Point.5` 
             = x

Note that Japanese users must type the following rule body:

Click OK when done. The intersect operator launches an error message if the intersection is empty.

Right-click the rule in the specification tree and select Properties.

Check the Do not catch evaluation errors check box and click OK when done. This way, the evaluation of the rule will be forced even if an update error occurs.