/**
* If the condition satisfies, return the given A in left, otherwise, return the given B in right.
*
* @param c The condition to test.
* @param right The right value to use if the condition satisfies.
* @param left The left value to use if the condition does not satisfy.
* @return A constructed either based on the given condition.
*/
public static <A, B> Either<A, B> iif(final boolean c, final P1<B> right, final P1<A> left) {
return c ? new Right<A, B>(right._1()) : new Left<A, B>(left._1());
}
/**
* The value of this projection or the given argument.
*
* @param b The value to return if this projection has no value.
* @return The value of this projection or the given argument.
*/
public B orValue(final P1<B> b) {
return isRight() ? value() : b._1();
}
/**
* The value of this projection or the given argument.
*
* @param a The value to return if this projection has no value.
* @return The value of this projection or the given argument.
*/
public A orValue(final P1<A> a) {
return isLeft() ? value() : a._1();
}
/**
* Returns the value of this projection or fails with the given error message.
*
* @param err The error message to fail with.
* @return The value of this projection
*/
public B valueE(final P1<String> err) {
if (e.isRight())
//noinspection CastToConcreteClass
return ((Right<A, B>) e).b;
else throw error(err._1());
}
/**
* Returns the value of this projection or fails with the given error message.
*
* @param err The error message to fail with.
* @return The value of this projection
*/
public A valueE(final P1<String> err) {
if (e.isLeft())
//noinspection CastToConcreteClass
return ((Left<A, B>) e).a;
else throw error(err._1());
}
