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21.5. Fibonacci Example: Bootstrap Rule
rule Bootstrap
when
f : Fibonacci( sequence == 1 || == 2, value == -1 ) // multi-restriction
then
modify ( f ){ value = 1 };
System.out.println( f.sequence + " == " + f.value );
end- When a
Fibonacciobject with a sequence field of 2 is asserted the Bootstrap rule is matched and activated along with the Recurse rule. - Note the multi-restriction on field
sequence, testing for equality with 1 or 2. - When a
Fibonacciobject with a sequence of 1 is asserted the Bootstrap rule is matched again, causing two activations for this rule. The Recurse rule does not match and activate because thenotconditional element stops the rule's matching as soon as aFibonacciobject with a sequence of 1 exists.
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