ytanikin edited a comment on pull request #564:
URL: https://github.com/apache/commons-lang/pull/564#issuecomment-651271832
`ObjectUtils.getIfNull(
number,
() -> Support.getMasterNumber(file),
() -> Support.getPredefinedNumber(file),
this::takeFreeNumber,
Support::getUndefinedNumber
);`
it is a lazy calculation, don't need to calculate all possible values and
use ObjectUtils.firstNonNull
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