package cn.jk.cloud.framework.common.util.collection;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.collection.CollectionUtil;
import com.google.common.collect.ImmutableMap;
import java.util.*;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Collectors;
/**
- Collection 工具类
* - @author 芋道源码
*/
public class CollectionUtils {
public static boolean containsAny(Object source, Object... targets) {
return Arrays.asList(targets).contains(source);
}
public static boolean isAnyEmpty(Collection<?>... collections) {
return Arrays.stream(collections).anyMatch(CollectionUtil::isEmpty);
}
public static <T> List<T> filterList(Collection<T> from, Predicate<T> predicate) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return from.stream().filter(predicate).collect(Collectors.toList());
}
public static <T, R> List<T> distinct(Collection<T> from, Function<T, R> keyMapper) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return distinct(from, keyMapper, (t1, t2) -> t1);
}
public static <T, R> List<T> distinct(Collection<T> from, Function<T, R> keyMapper, BinaryOperator<T> cover) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return new ArrayList<>(convertMap(from, keyMapper, Function.identity(), cover).values());
}
public static <T, U> List<U> convertList(Collection<T> from, Function<T, U> func) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return from.stream().map(func).filter(Objects::nonNull).collect(Collectors.toList());
}
public static <T, U> List<U> convertList(Collection<T> from, Function<T, U> func, Predicate<T> filter) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return from.stream().filter(filter).map(func).filter(Objects::nonNull).collect(Collectors.toList());
}
public static <T, U> Set<U> convertSet(Collection<T> from, Function<T, U> func) {
if (CollUtil.isEmpty(from)) {
return new HashSet<>();
}
return from.stream().map(func).filter(Objects::nonNull).collect(Collectors.toSet());
}
public static <T, U> Set<U> convertSet(Collection<T> from, Function<T, U> func, Predicate<T> filter) {
if (CollUtil.isEmpty(from)) {
return new HashSet<>();
}
return from.stream().filter(filter).map(func).filter(Objects::nonNull).collect(Collectors.toSet());
}
public static <T, K> Map<K, T> convertMap(Collection<T> from, Function<T, K> keyFunc) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return convertMap(from, keyFunc, Function.identity());
}
public static <T, K> Map<K, T> convertMap(Collection<T> from, Function<T, K> keyFunc, Supplier<? extends Map<K, T>> supplier) {
if (CollUtil.isEmpty(from)) {
return supplier.get();
}
return convertMap(from, keyFunc, Function.identity(), supplier);
}
public static <T, K, V> Map<K, V> convertMap(Collection<T> from, Function<T, K> keyFunc, Function<T, V> valueFunc) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return convertMap(from, keyFunc, valueFunc, (v1, v2) -> v1);
}
public static <T, K, V> Map<K, V> convertMap(Collection<T> from, Function<T, K> keyFunc, Function<T, V> valueFunc, BinaryOperator<V> mergeFunction) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return convertMap(from, keyFunc, valueFunc, mergeFunction, HashMap::new);
}
public static <T, K, V> Map<K, V> convertMap(Collection<T> from, Function<T, K> keyFunc, Function<T, V> valueFunc, Supplier<? extends Map<K, V>> supplier) {
if (CollUtil.isEmpty(from)) {
return supplier.get();
}
return convertMap(from, keyFunc, valueFunc, (v1, v2) -> v1, supplier);
}
public static <T, K, V> Map<K, V> convertMap(Collection<T> from, Function<T, K> keyFunc, Function<T, V> valueFunc, BinaryOperator<V> mergeFunction, Supplier<? extends Map<K, V>> supplier) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return from.stream().collect(Collectors.toMap(keyFunc, valueFunc, mergeFunction, supplier));
}
public static <T, K> Map<K, List<T>> convertMultiMap(Collection<T> from, Function<T, K> keyFunc) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return from.stream().collect(Collectors.groupingBy(keyFunc, Collectors.mapping(t -> t, Collectors.toList())));
}
public static <T, K, V> Map<K, List<V>> convertMultiMap(Collection<T> from, Function<T, K> keyFunc, Function<T, V> valueFunc) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return from.stream()
.collect(Collectors.groupingBy(keyFunc, Collectors.mapping(valueFunc, Collectors.toList())));
}
// 暂时没想好名字，先以 2 结尾噶
public static <T, K, V> Map<K, Set<V>> convertMultiMap2(Collection<T> from, Function<T, K> keyFunc, Function<T, V> valueFunc) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return from.stream().collect(Collectors.groupingBy(keyFunc, Collectors.mapping(valueFunc, Collectors.toSet())));
}
public static <T, K> Map<K, T> convertImmutableMap(Collection<T> from, Function<T, K> keyFunc) {
if (CollUtil.isEmpty(from)) {
return Collections.emptyMap();
}
ImmutableMap.Builder<K, T> builder = ImmutableMap.builder();
from.forEach(item -> builder.put(keyFunc.apply(item), item));
return builder.build();
}
public static boolean containsAny(Collection<?> source, Collection<?> candidates) {
return org.springframework.util.CollectionUtils.containsAny(source, candidates);
}
public static <T> T getFirst(List<T> from) {
return !CollectionUtil.isEmpty(from) ? from.get(0) : null;
}
public static <T> T findFirst(List<T> from, Predicate<T> predicate) {
if (CollUtil.isEmpty(from)) {
return null;
}
return from.stream().filter(predicate).findFirst().orElse(null);
}
public static <T, V extends Comparable<? super V>> V getMaxValue(List<T> from, Function<T, V> valueFunc) {
if (CollUtil.isEmpty(from)) {
return null;
}
assert from.size() > 0; // 断言，避免告警
T t = from.stream().max(Comparator.comparing(valueFunc)).get();
return valueFunc.apply(t);
}
public static <T, V extends Comparable<? super V>> V getMinValue(List<T> from, Function<T, V> valueFunc) {
if (CollUtil.isEmpty(from)) {
return null;
}
assert from.size() > 0; // 断言，避免告警
T t = from.stream().min(Comparator.comparing(valueFunc)).get();
return valueFunc.apply(t);
}
public static <T, V extends Comparable<? super V>> V getSumValue(List<T> from, Function<T, V> valueFunc, BinaryOperator<V> accumulator) {
if (CollUtil.isEmpty(from)) {
return null;
}
assert from.size() > 0; // 断言，避免告警
return from.stream().map(valueFunc).reduce(accumulator).get();
}
public static <T> void addIfNotNull(Collection<T> coll, T item) {
if (item == null) {
return;
}
coll.add(item);
}
public static <T> Collection<T> singleton(T deptId) {
return deptId == null ? Collections.emptyList() : Collections.singleton(deptId);
}
}