View (VIEW)

The view operator creates a property, defined on the objects of an object group, that returns TRUE when their object collection is included in the set of object collections currently displayed to the user in the group, and NULL otherwise.

Language

To declare a property that determines whether a specified object collection is displayed to the user or not, use the VIEW operator.

Examples

CLASS Store;
name = DATA STRING[100] (Store);

FORM stores
    OBJECTS s = Store
;
countF 'Number of filtered warehouses' = GROUP SUM 1 IF [ VIEW stores.s](Store s);
orderF 'Order in an object group' (Store s) = PARTITION SUM 1 IF [ FILTER stores.s](s) ORDER [ ORDER stores.s](s), s;
setNameX 'Add X to name'()  {
    LOCAL k = INTEGER ();
    k() <- 0;
    FOR [ FILTER stores.s](Store s) ORDER [ ORDER stores.s](s) DO {
        k() <- k() + 1;
        name(s) <- 'X' + k() + name(s);
    }
}