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package org.zwobble.couscous.util;
import com.google.common.collect.ImmutableMap;
import java.util.AbstractMap;
import java.util.Map;
import java.util.Optional;
import java.util.function.Function;
public class ExtraMaps {
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> Optional<V> lookup(Map<K, V> map, K key) {
return Optional.ofNullable(map.get(key));
}
public static <T, K, V> Map<K, V> toMap(Iterable<K> keys, Iterable<V> values) {
return toMap(ExtraIterables.lazyMap(keys, values, ExtraMaps::entry));
}
public static <T, K, V> Map<K, V> toMap(Iterable<Map.Entry<K, V>> entries) {
ImmutableMap.Builder<K, V> builder = ImmutableMap.builder();
entries.forEach(builder::put);
return builder.build();
}
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 value : iterable) {
builder.put(function.apply(value));
}
return builder.build();
}
public static <T, K> Map<K, T> toMapWithKeys(Iterable<T> iterable, Function<T, K> function) {
return toMap(iterable, value -> entry(function.apply(value), value));
}
public static <K, V> Map.Entry<K, V> entry(K key, V value) {
return new AbstractMap.SimpleImmutableEntry<>(key, value);
}
}
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