Package net.hydromatic.morel.util

Class Folder<E>

java.lang.Object

net.hydromatic.morel.util.Folder<E>

Type Parameters:

E - Element type

Direct Known Subclasses:

Folder.End

public abstract class Folder<E>
extends Object

Enable creating right-deep trees.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	Folder.End<E>	Sub-class of Folder that marks the end of a list.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) E	e

Constructor Summary

Constructors

Constructor	Description
Folder(E e)

Method Summary

Modifier and Type	Method	Description
private static <E> void	append(List<Folder<E>> list, E e, Function<E,Folder<E>> fn)	Adds an element and operator to a non-empty list.
static void	at(List<Folder<Ast.Exp>> list, Ast.Exp exp)	Appends an element using "@".
(package private) abstract E	combine(List<Folder<E>> list)
static <E> E	combineAll(List<Folder<E>> list)
static void	cons(List<Folder<Ast.Exp>> list, Ast.Exp exp)	Appends an element using "::".
private static <E> Folder<E>	end(E e)
private static Folder<Ast.Exp>	op(Ast.Exp exp, Op at)	Creates a folder that combines an expression with whatever follows using an infix operator.
static <E> void	start(List<Folder<E>> list, E e)	Adds an element to an empty list.

Methods inherited from class java.lang.Object

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

Field Detail

e

final E e

Constructor Detail

Folder

Folder(E e)

Method Detail

combine

abstract E combine(List<Folder<E>> list)

combineAll

public static <E> E combineAll(List<Folder<E>> list)

end

private static <E> Folder<E> end(E e)

at

public static void at(List<Folder<Ast.Exp>> list,
                      Ast.Exp exp)

Appends an element using "@".

cons

public static void cons(List<Folder<Ast.Exp>> list,
                        Ast.Exp exp)

Appends an element using "::".

start

public static <E> void start(List<Folder<E>> list,
                             E e)

Adds an element to an empty list.

append

private static <E> void append(List<Folder<E>> list,
                               E e,
                               Function<E,Folder<E>> fn)

Adds an element and operator to a non-empty list.

op

private static Folder<Ast.Exp> op(Ast.Exp exp,
                                  Op at)

Creates a folder that combines an expression with whatever follows using an infix operator.