/* __ __ __ __ __ ___
* \ \ / / \ \ / / __/
* \ \/ / /\ \ \/ / /
* \____/__/ \__\____/__/.ɪᴏ
* ᶜᵒᵖʸʳᶦᵍʰᵗ ᵇʸ ᵛᵃᵛʳ ⁻ ˡᶦᶜᵉⁿˢᵉᵈ ᵘⁿᵈᵉʳ ᵗʰᵉ ᵃᵖᵃᶜʰᵉ ˡᶦᶜᵉⁿˢᵉ ᵛᵉʳˢᶦᵒⁿ ᵗʷᵒ ᵈᵒᵗ ᶻᵉʳᵒ
*/
package io.vavr.collection;
import io.vavr.Tuple2;
import java.util.Objects;
import java.util.function.Function;
/**
* INTERNAL: Common {@code Multimap} functions (not intended to be public).
*
* @author Ruslan Sennov, Daniel Dietrich
*/
class Multimaps {
@SuppressWarnings("unchecked")
static <K, V, M extends Multimap<K, V>> M ofJavaMap(M source, java.util.Map<? extends K, ? extends V> map) {
Objects.requireNonNull(map, "map is null");
return Stream.ofAll(map.entrySet()).foldLeft(source, (m, el) -> (M) m.put(el.getKey(), el.getValue()));
}
@SuppressWarnings("unchecked")
static <T, K, V, M extends Multimap<K, V>> M ofStream(M source, java.util.stream.Stream<? extends T> stream,
Function<? super T, ? extends K> keyMapper,
Function<? super T, ? extends V> valueMapper) {
Objects.requireNonNull(stream, "stream is null");
Objects.requireNonNull(keyMapper, "keyMapper is null");
Objects.requireNonNull(valueMapper, "valueMapper is null");
return Stream.ofAll(stream).foldLeft(source, (m, el) -> (M) m.put(keyMapper.apply(el), valueMapper.apply(el)));
}
@SuppressWarnings("unchecked")
static <T, K, V, M extends Multimap<K, V>> M ofStream(M source, java.util.stream.Stream<? extends T> stream,
Function<? super T, Tuple2<? extends K, ? extends V>> entryMapper) {
Objects.requireNonNull(stream, "stream is null");
Objects.requireNonNull(entryMapper, "entryMapper is null");
return Stream.ofAll(stream).foldLeft(source, (m, el) -> (M) m.put(entryMapper.apply(el)));
}
}