Extended Attribute Properties

Specifies the form of the data to be held by the extended attribute. You can choose from:

• Boolean
• Color
• Date or Time
• File or Path
• Integer, Float, or Hex
• Font, Font Name, Font Size, or Font Style
• Object - Specify the Object type, Object stereotype (if appropriate), and Inverse collection name in the properties below. For more information, see Linking Objects Through Extended Attributes.
• String (single line) or Text (multi-line)

Specifies that the extended attribute is calculated from other values using VBScript on the Get Method Script, Set Method Script, and Global Script tabs. When you select this checkbox, you must choose between:

• Read/Write (Get+Set methods)

• Read only (Get method)

In the following example script, the FileGroup computed extended attribute gets its value from and sets the value of the filegroup physical option of the object:

Function %Get%(obj)
%Get% = obj.GetPhysicalOptionValue("on/<filegroup>")
End Function

Sub %Set%(obj, value)
obj.SetPhysicalOptionValue "on/<filegroup>", value
End Sub

[if not computed] Specifies a default value for the attribute. You can specify the value in any of the following ways:

• Enter the value directly in the list.

• [predefined data types] Click the Ellipsis button to open a dialog listing possible values. For example, if the data type is set to Color, the Ellipsis button opens a palette window.

• [user-defined data types] Select a value from the list.

Specifies a list of possible values for the attribute in one of the following ways:

• Enter a static list of semi-colon-delimited values directly in the field.

• Use the tools to the right of the list to create or select a GTL template to generate the list dynamically.

  If the attribute type is Object, and you do not want to filter the list of available objects in any way, you can leave this field blank.

  To perform a simple filter of the list of objects, use the .collection macro (see .collection Macro). In the following example, only tables with the Generated attribute set to true will be available for selection:

  .collection(Model.Tables, %Generated%==true)

  For more complex filtering, use the foreach_item macro (see .foreach_item Macro):

  .foreach_item (Model.Tables)
     .if %Generated% 
     .// (or more complex criteria)
        %ObjectID%
     .endif
  .next (\n)

This method is often used to apply a filter defined in the List of values field in the object picker. In the following example, only tables with the Generated attribute set to true will be available for selection:

Sub %Method%(obj)
   
   Dim Mdl
   Set Mdl = obj.Model
   
   Dim Sel
   Set Sel = Mdl.CreateSelection
   
   If not (Sel is nothing) Then
      Dim table
      For Each table in Mdl.Tables
          if table.generated then
              Sel.Objects.Add table
          end if
      Next

      ' Display the object picker on the selection
      Dim selObj
      set selObj = Sel.ShowObjectPicker
      If Not (selObj is Nothing) Then
         obj.SetExtendedAttribute "Storage-For-Each", selObj
       End If
      
      Sel.Delete
   End If
   
End Sub