Implement @Optional for method parameters
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Key: QI-144
URL: http://issues.ops4j.org/jira/browse/QI-144
Project: Qi4j
Issue Type: New Feature
Reporter: Rickard Öberg
Assignee: Rickard Öberg
Currently the best way to declare that a method parameter cannot be null is to
use the @NotNull constraint. It has been argued that this should be the default
case, and instead one would have to set @Optional if it is not necessary.
Instead of:
void doStuff(String optional, @NotNull String mandatory);
one would do:
void doStuff(@Optional String optional, String mandatory);
If the value is optional, then a null value would imply that there is no need
to call the constraints of that parameter. Implementing this in the framework
would simplify constraints as they would then know that if they are invoked the
value would be non-null.
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