public class Books {
public static Gen<String> titleGenerator = Arbitrary.arbAlphaNumString.gen;
public static Gen<String> isbnGenerator = Arbitrary.arbAlphaNumString.gen;
public static Gen<Option<String>> optionalIsbnGenerator =
Arbitrary.arbBoolean.gen.bind(
new F<Boolean, Gen<Option<String>>>() {
@Override
public Gen<Option<String>> f(Boolean aBoolean) {
if (aBoolean) return isbnGenerator.map(Option.<String>some_());
else return Gen.elements(Option.<String>none());
}
});
public static Gen<Book> bookGenerator =
titleGenerator.bind(
optionalIsbnGenerator,
new F2<String, Option<String>, Book>() {
@Override
public Book f(String s1, Option<String> s2) {
return new Book(s1, s2);
}
}.curry());
public static Gen<List<Book>> bookListGenerator = Gen.listOf(bookGenerator);
}
@Override
public Gen<Option<String>> f(Boolean aBoolean) {
if (aBoolean) return isbnGenerator.map(Option.<String>some_());
else return Gen.elements(Option.<String>none());
}