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package org.zwobble.mammoth.internal.util;
import com.google.common.collect.ImmutableMap;
import java.util.*;
import java.util.function.Function;
public class MammothMaps {
public static <K, V> Map<K, V> map() {
return ImmutableMap.of();
}
public static <K, V> Map<K, V> map(K key1, V value1) {
return ImmutableMap.of(key1, value1);
}
public static <K, V> Map<K, V> map(K key1, V value1, K key2, V value2) {
return ImmutableMap.of(key1, value1, key2, value2);
}
public static <K, V> Map<K, V> map(K key1, V value1, K key2, V value2, K key3, V value3) {
return ImmutableMap.of(key1, value1, key2, value2, key3, value3);
}
public static <K, V> Map.Entry<K, V> entry(K key, V value) {
return new AbstractMap.SimpleImmutableEntry<K, V>(key, value);
}
public static <K, V> Optional<V> lookup(Map<K, V> map, K key) {
return Optional.ofNullable(map.get(key));
}
public static <T, K> Map<K, T> toMapWithKey(Iterable<T> iterable, Function<T, K> function) {
return toMap(iterable, element -> entry(function.apply(element), element));
}
public static <T, K, V> Map<K, V> toMap(Iterable<T> iterable, Function<T, Map.Entry<K, V>> function) {
ImmutableMap.Builder<K, V> builder = ImmutableMap.builder();
for (T element : iterable) {
builder.put(function.apply(element));
}
return builder.build();
}
public static <T, K> Map<K, List<T>> toMultiMapWithKey(Iterable<T> iterable, Function<T, K> function) {
return toMultiMap(iterable, element -> entry(function.apply(element), element));
}
public static <T, K, V> Map<K, List<V>> toMultiMap(Iterable<T> iterable, Function<T, Map.Entry<K, V>> function) {
Map<K, List<V>> map = new HashMap<>();
for (T element : iterable) {
Map.Entry<K, V> pair = function.apply(element);
map.computeIfAbsent(pair.getKey(), key -> new ArrayList<V>())
.add(pair.getValue());
}
return map;
}
public static <K, V1, V2> Map<K, V2> eagerMapValues(Map<K, V1> map, Function<V1, V2> function) {
Map<K, V2> result = new HashMap<>();
for (Map.Entry<K, V1> element : map.entrySet()) {
result.put(element.getKey(), function.apply(element.getValue()));
}
return result;
}
}
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