org.forgerock.util

Interface Function<VIN,VOUT,E extends Exception>

Type Parameters:

VIN - The type of the function parameter, or Void if the function does not expect a parameter.

VOUT - The type of the function result, or Void if the function does not return anything (i.e. it only has side-effects).

E - The type of the exception thrown by the function, or NeverThrowsException if no exception is thrown by the function.

All Known Implementing Classes:

CloseSilentlyFunction, HsmKeyStoreLoader, JsonValueTraverseFunction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface Function<VIN,VOUT,E extends Exception>

A synchronous function which returns a result immediately.

Exception handling: implementations which do not throw any exceptions should declare that they throw an exception of type NeverThrowsException.

Example usage:

 public class IsPossiblePrime implements Function<String, Boolean, IllegalArgumentException> {
     public Boolean apply(String value) throws IllegalArgumentException {
         // Parse the parameter now and potentially immediately throw an
         // exception.
         final BigInteger possiblePrime = new BigInteger(value);

         // Determine if the parameter is a prime number.
         return possiblePrime.isProbablePrime(1000);
     }
 }
 

See Also:

AsyncFunction, NeverThrowsException

Method Summary

Modifier and Type	Method and Description
VOUT	apply(VIN value) Applies this function to the input parameter value and returns the result.

Method Detail

apply

VOUT apply(VIN value)
    throws E extends Exception

Applies this function to the input parameter value and returns the result.

Parameters:

value - The input parameter.

Returns:

The result of applying this function to value.

Throws:

E - If this function cannot be applied to value.

E extends Exception