In the following code of A* algorithm here, I have 2 functions setG and calcF, such that -
setG must be called before calcF &&calcF must be called after setGin other words, simply calling setG without calling calcF later is incorrect. Also, simply calling calcF without calling setG before is incorrect. Calling calcF before setG is incorrect.
How can this rule be enfored to the client ?
A similar question exists here, but there is a minute difference. This question is more stricter in conditions.
The first idea would be to merge those functions into one function setGAndCalcF():
private void setG(int g);
private void calcF(T destination);
public void setGAndCalcF(int g, T destination) {
setG(g);
calcF(destination);
}
If this is not feasible you can implement runtime checks (plus documentation) into setG() and calcF() which would throw an Exception (e.g. IllegalStateException).
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