forked from Speiger/Primitive-Collections
100 lines
2.7 KiB
Plaintext
100 lines
2.7 KiB
Plaintext
package speiger.src.collections.PACKAGE.utils;
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#if TYPE_OBJECT
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import java.util.function.Function;
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import speiger.src.collections.PACKAGE.collections.ITERABLE;
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import speiger.src.collections.PACKAGE.collections.ITERATOR;
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#endif
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/**
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* A Helper class for Iterables
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*/
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public class ITERABLES
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{
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#if TYPE_OBJECT
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/**
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* A Helper function that maps a Iterable into a new Type.
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* @param iterable the iterable that should be mapped
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* @param mapper the function that decides what the result turns into.
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* @Type(T)
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* @Type(E)
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* @return a iterable that is mapped to a new result
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*/
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public static <T, E> ITERABLE<T> map(ITERABLE<E> iterable, Function<E, T> mapper) {
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return new MappedIterableBRACES(iterable, mapper);
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}
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/**
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* A Helper function that flatMaps a Iterable into a new Type.
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* @param iterable the iterable that should be flatMapped
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* @param mapper the function that decides what the result turns into.
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* @Type(T)
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* @Type(V)
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* @Type(E)
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* @return a iterable that is flatMapped to a new result
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*/
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public static <T, E, V extends Iterable<T>> ITERABLE<T> flatMap(ITERABLE<E> iterable, Function<E, V> mapper) {
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return new FlatMappedIterableBRACES(iterable, mapper);
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}
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/**
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* A Helper function that flatMaps a Iterable into a new Type.
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* @param iterable the iterable that should be flatMapped
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* @param mapper the function that decides what the result turns into.
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* @Type(T)
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* @Type(E)
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* @return a iterable that is flatMapped to a new result
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*/
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public static <T, E> ITERABLE<T> arrayFlatMap(ITERABLE<E> iterable, Function<E, T[]> mapper) {
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return new FlatMappedArrayIterableBRACES(iterable, mapper);
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}
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private static class MappedIterable<E, T> implements ITERABLE<T>
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{
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ITERABLE<E> iterable;
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Function<E, T> mapper;
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MappedIterable(ITERABLE<E> iterable, Function<E, T> mapper) {
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this.iterable = iterable;
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this.mapper = mapper;
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}
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public ITERATOR<T> iterator() {
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return ITERATORS.map(iterable.iterator(), mapper);
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}
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}
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private static class FlatMappedIterable<E, T, V extends Iterable<T>> implements ITERABLE<T>
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{
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ITERABLE<E> iterable;
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Function<E, V> mapper;
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FlatMappedIterable(ITERABLE<E> iterable, Function<E, V> mapper) {
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this.iterable = iterable;
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this.mapper = mapper;
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}
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@Override
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public ITERATOR<T> iterator() {
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return ITERATORS.flatMap(iterable.iterator(), mapper);
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}
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}
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private static class FlatMappedArrayIterable<E, T> implements ITERABLE<T>
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{
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ITERABLE<E> iterable;
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Function<E, T[]> mapper;
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FlatMappedArrayIterable(ITERABLE<E> iterable, Function<E, T[]> mapper) {
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this.iterable = iterable;
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this.mapper = mapper;
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}
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@Override
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public ITERATOR<T> iterator() {
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return ITERATORS.arrayFlatMap(iterable.iterator(), mapper);
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}
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}
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#endif
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} |