Package com.pholser.junit.quickcheck.generator

Class Lambdas

java.lang.Object

com.pholser.junit.quickcheck.generator.Lambdas

public final class Lambdas
extends Object

Helper class for creating instances of "functional interfaces".

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	Lambdas.LambdaInvocationHandler<T,U>

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Lambdas()

Method Summary

Modifier and Type	Method	Description
static <T, U> T	makeLambda(Class<T> lambdaType, Generator<U> returnValueGenerator, GenerationStatus status)	Creates an instance of a given "functional interface" type, whose single abstract method returns values of the type produced by the given generator.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Lambdas

private Lambdas()

Method Details

makeLambda

public static <T,
U> T makeLambda(Class<T> lambdaType,
 Generator<U> returnValueGenerator,
 GenerationStatus status)

Creates an instance of a given "functional interface" type, whose single abstract method returns values of the type produced by the given generator. The arguments to the lambda's single method will be used to seed a random generator that will be used to generate the return value of that method.

junit-quickcheck uses this to create random values for property parameters whose type is determined to be a functional interface. Custom generators for functional interface types can use this also.

Type Parameters:

T - the functional interface type token

U - the type of the generated return value of the functional interface method

Parameters:

lambdaType - a functional interface type token

returnValueGenerator - a generator for the return type of the functional interface's single method

status - an object to be passed along to the generator that will produce the functional interface's method return value

Returns:

an instance of the functional interface type, whose single method will return a generated value

Throws:

IllegalArgumentException - if lambdaType is not a functional interface type