Comments (2)
The problem is that expression fromJSON(file)
always evaluates in orElse
call. You should use orElseGet(Supplier other)
.
return Optional.of((Quest) oin.readObject())
.filter(q -> q.status != null)
.orElseGet(() -> fromJSON(file));
This code:
return Optional.of((Quest) oin.readObject())
.filter(q -> q.status != null)
.orElse(fromJSON(file));
is identical to:
// Optional.of
Quest q = (Quest) oin.readObject();
// filter
if (q != null) {
q = (q.status != null) ? q : null;
}
// orElse
Quest other = fromJSON(file);
return (q != null) ? q : other;
from lightweight-stream-api.
Thanks for explanation and example
from lightweight-stream-api.
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