Package org.organicdesign.fp.function
Exception-friendly functional interfaces named by the number of arguments: Fn0, Fn1, Fn2....
All of these have an applyEx()
method that that throws an Exception and returns a result.
Implementers should override the applyEx()
method (this happens automatically when you use Java 8's lambda syntax).
Each interface also has a default apply()
method for consumers of this function to call.
It re-throws all exceptions after wrapping any checked ones in unchecked RuntimeException
s.
For simplicity, there are no primitive versions of these functions, no "void" return types, and no special-purpose funny names.
If you don't want to return a result, declare the return type as ?
and return null.
Comparing just the Consumer interfaces from { @link java.util.function}:
java.util.function | org.organicdesign.fp.function |
---|---|
Consumer<T> | Fn1<T,?> |
DoubleConsumer | Fn1<Double,?> |
IntConsumer | Fn1<Integer,?> |
LongConsumer | Fn1<Long,?> |
BiConsumer<T,U> | Fn2<T,U,?> |
ObjDoubleConsumer<T> | Fn2<T,Double,?> |
ObjIntConsumer<T> | Fn2<T,Integer,?> |
ObjLongConsumer<T> | Fn2<T,Long,?> |
-
Interface Summary Interface Description Fn0<U> This is like Java 8's java.util.function.Supplier, but retrofitted to turn checked exceptions into unchecked ones.Fn1<T,U> This is like Java 8's java.util.function.Function, but retrofitted to turn checked exceptions into unchecked ones.Fn2<A,B,R> This is like Java 8's java.util.function.BiFunction, but retrofitted to turn checked exceptions into unchecked ones.Fn3<A,B,C,R> A three-argument, exception-safe functional interface. -
Class Summary Class Description LazyRef<T> Lazily initialize a value (and free the initialization resources) on the first call to get(). -
Enum Summary Enum Description Fn1.BooleanCombiner Fn1.ConstObjBool Constant functions that take an Object and return a BooleanFn1.ConstObjObj Constant functions that take an Object and return an ObjectFn2.Singletons