Predicates? (original) (raw)
Dan Smith daniel.smith at oracle.com
Thu Apr 18 12:10:14 PDT 2013
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On Apr 18, 2013, at 12:56 PM, Mike Duigou <mike.duigou at oracle.com> wrote:
On Apr 18 2013, at 11:38 , Michael Nascimento wrote:
Hi folks,
Have you already considered a Predicates class / static methods in Predicate with useful methods such as alwaysTrue(), alwaysFalse(), We had this in the past but honestly t -> false is just simpler. isNull() etc? We added Objects.isNull and Objects.isNonNull to be used as method references rather than on Predicates.
This is the general strategy to take for things like this, and a luxury Guava didn't have. Example:
Predicate isNull = Objects::isNull;
On performance: I'm sure Guava is optimized so that its methods always return a singleton. In principle, the semantics of lambdas and method references are abstract enough that you shouldn't have to worry about that. In practice, I wouldn't expect clever optimizations like that (e.g., turning every "x -> true" into the same object) in the near future.
—Dan
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