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From "Dmitri Blinov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (JEXL-268) Jexl lambdas as parameters to new Java8 methods
Date Tue, 21 Aug 2018 09:37:00 GMT
Dmitri Blinov created JEXL-268:
----------------------------------

             Summary: Jexl lambdas as parameters to new Java8 methods
                 Key: JEXL-268
                 URL: https://issues.apache.org/jira/browse/JEXL-268
             Project: Commons JEXL
          Issue Type: New Feature
    Affects Versions: 3.1
            Reporter: Dmitri Blinov


Java8 introduced functional interfaces, among them {{Function}} and {{BiFunction}} interfaces
which are used as parameters to method calls, for example, {{Map.computeIfAbsent()}} or {{Map.computeIfPresent()}}.
In Jexl we have lambdas which in theory are good candidates to construct a {{Function}} for
lambda with one parameter, and a {{BiFunction}} for lambda with two parameters.

The problem is Jexl can not currently support Java8 features and all instances of lambda are
of single {{internal.Closure}} class, which should not try to implement both interfaces at
once. One of the solutions, IMO, is to have a feature to overload lamda creations to construct
custom lambda classes without shaking Jexl code tree.



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