in regards to the case of Codelfa Construction Pty Ltd v State Rail Authority of NSW [1982] HCA 24; (1982) 149 CLR 337

https://www.australiancontractlaw.com/cases/codelfa.html

What principles of law were decided and/or relied on by the judges in forming their conclusions on those arguments? You must explain any differences between the reasoning of the judges on these issues.

arguments were that there was no implied term, and that the contract was frustrated