de.caff.generics

Class TypesImplFolding

java.lang.Object

de.caff.generics.TypesImplFolding

final class TypesImplFolding
extends java.lang.Object

Partial class used by Types, defining the folding algorithms.

Author:

Rammi

Method Summary

Modifier and Type	Method and Description
static <V,T> V	foldLeftImpl(java.util.Enumeration<T> enumeration, V initialValue, java.util.function.BiFunction<? super V,? super T,? extends V> folder) Do left-associative folding of an enumeration.
static <V,T> V	foldLeftImpl(java.util.Iterator<T> iterator, V initialValue, java.util.function.BiFunction<? super V,? super T,? extends V> folder) Do left-associative folding of an iterator.
static <V,T> V	foldRightImpl(java.util.List<T> list, V initialValue, java.util.function.BiFunction<? super V,? super T,? extends V> folder) Do right-associative folding of an iteration.
static <V,T> V	foldRightImpl(java.util.ListIterator<T> reverseIterator, V initialValue, java.util.function.BiFunction<? super V,? super T,? extends V> folder) Do right-associative folding of a list iterator using it in reverse direction.

Methods inherited from class java.lang.Object

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

Method Detail

foldLeftImpl

public static <V,T> V foldLeftImpl(@NotNull
                                   java.util.Iterator<T> iterator,
                                   V initialValue,
                                   @NotNull
                                   java.util.function.BiFunction<? super V,? super T,? extends V> folder)

Do left-associative folding of an iterator.

Folding is the reduction of the elements of a collection into one value, by applying the same function on each element with the result of the last call.

See Types.foldLeft(Iterable, Object, BiFunction) for a code example.

Type Parameters:

V - accumulated value type

T - iterable type

Parameters:

iterator - iterator which elements are folded together

initialValue - start value

folder - folding function, the apply method gets the accumulated value as its first and the element as its second argument, and returns the result of their combination

Returns:

accumulated value

foldLeftImpl

public static <V,T> V foldLeftImpl(@NotNull
                                   java.util.Enumeration<T> enumeration,
                                   V initialValue,
                                   @NotNull
                                   java.util.function.BiFunction<? super V,? super T,? extends V> folder)

Do left-associative folding of an enumeration.

Folding is the reduction of the elements of a collection into one value, by applying the same function on each element with the result of the last call.

See Types.foldLeft(Iterable, Object, BiFunction) for a code example.

Type Parameters:

V - accumulated value type

T - iterable type

Parameters:

enumeration - enumeration which elements are folded together

initialValue - start value

folder - folding function, the apply method gets the accumulated value as its first and the element as its second argument, and returns the result of their combination

Returns:

accumulated value

foldRightImpl

public static <V,T> V foldRightImpl(@NotNull
                                    java.util.List<T> list,
                                    V initialValue,
                                    @NotNull
                                    java.util.function.BiFunction<? super V,? super T,? extends V> folder)

Do right-associative folding of an iteration.

Folding is the reduction of the elements of a collection into one value, by applying the same function on each element with the result of the last call.

Type Parameters:

V - accumulated value type

T - iterator type

Parameters:

list - list which elements are folded together

initialValue - start value

folder - folding function, the apply method gets the accumulated value as its first and the element as its second argument, and returns the result of their combination

Returns:

accumulated value

foldRightImpl

public static <V,T> V foldRightImpl(@NotNull
                                    java.util.ListIterator<T> reverseIterator,
                                    V initialValue,
                                    @NotNull
                                    java.util.function.BiFunction<? super V,? super T,? extends V> folder)

Do right-associative folding of a list iterator using it in reverse direction.

Folding is the reduction of the elements of a collection into one value, by applying the same function on each element with the result of the last call.

Type Parameters:

V - accumulated value type

T - list type

Parameters:

reverseIterator - iterator which is traverse in reverse direction

initialValue - start value

folder - folding function, the apply method gets the accumulated value as its first and the element as its second argument, and returns the result of their combination

Returns:

accumulated value