Interfaces for Command Pattern in Java

Question

Is there a library out there that already provides the interfaces we need for the command pattern in Java?

For example:

 public interface Func1<T,R> { public R execute(T input); }

 public interface Func2<T1,T2,R> { public R execute(T1 input1, T2 input2); }

 public interface Predicate1<T> { public boolean execute(T input); }

 ....

Thanks.

This doesn't look like a command pattern library, this looks like a functional programming library. — Ernest Friedman-Hill
– Ernest Friedman-Hill, Commented May 1, 2012 at 22:05
Try Guava, they have Predicate and might also have those others. — Marko Topolnik
– Marko Topolnik, Commented May 1, 2012 at 22:06

JB Nizet · Accepted Answer · 2012-05-01 22:10:07Z

6

Guava has your first and third interfaces (called Function and Predicate). Your second one, IMHO, is not useful, because you would just have to combine T1 and T2 in a single object, and use the first interface instead.

More interesting, Guava also has a whole lot of methods using these two interfaces, like Iterables.any(Iterable, Predicate), Iterables.transform(Iterable, Function), etc.

answered May 1, 2012 at 22:10

JB Nizet

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