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To create the First End Of Association operation for coloring Associations between a Block and a Use Case

1. Create an Opaque Behavior named 'First End Of Association'.
2. Right-click the Opaque Behavior element and open its Specification window. Do one of the following:

   1. Click the plus sign next to the Owned Parameter property to edit it.

      Note
      If you cannot see the Owned Parameter property, make sure the Expert mode is enabled.

      
      

   2. On the left side menu, select Parameters > Create.
3. In the Specification of Parameter window, set Name to Association, Type to Association, and Direction to in. Click Back.
4. In the Opaque Behavior Specification window, click three dots Image Modified next to the Body and Language property to edit it.
5. In the Body and Language dialog, select Language > StructuredExpression.

6. Click Create operation > Script.

   Note
   If you cannot see the Script operation, make sure the Expert mode is enabled.

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7. Set the Operation Name to ‘First End’.
8. From the Language drop-down list, select Javascript Rhino.

9. Insert the following script as the Body:

   Code Block
   language js title Javascript Rhino
   arg1.size() > 0 ? arg1.iterator().next() : null

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10. Select First End > arg1 > Reset.
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11. Select First End > arg1 > Metachain Navigation.
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12. Click Insert.
13. Under Metaclass or Stereotype, select Association, and under Property, select End Type.
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14. Click OK.