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zjf committed 2024-12-17 18:27:44 +08:00
1 parent b03c4439fc
commit 6c91d4178f
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pjcloud-common/pjcloud-common-core/src/main/java/com/bsd/pjcloud/common/core/util/BeanUtils.java
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package com.bsd.pjcloud.common.core.util;
import cn.hutool.core.bean.BeanUtil;
import java.util.List;
import java.util.function.Consumer;
/**
* Bean 工具类
*
* 1. 默认使用 {@link BeanUtil} 作为实现类，虽然不同 bean 工具的性能有差别，但是对绝大多数同学的项目，不用在意这点性能
* 2. 针对复杂的对象转换，可以搜参考 AuthConvert 实现，通过 mapstruct + default 配合实现
*
* @author 芋道源码
*/
public class BeanUtils {
public static <T> T toBean(Object source, Class<T> targetClass) {
return BeanUtil.toBean(source, targetClass);
}
public static <T> T toBean(Object source, Class<T> targetClass, Consumer<T> peek) {
T target = toBean(source, targetClass);
if (target != null) {
peek.accept(target);
}
return target;
}
public static <S, T> List<T> toBean(List<S> source, Class<T> targetType) {
if (source == null) {
return null;
}
return CollectionUtils.convertList(source, s -> toBean(s, targetType));
}
public static <S, T> List<T> toBean(List<S> source, Class<T> targetType, Consumer<T> peek) {
List<T> list = toBean(source, targetType);
if (list != null) {
list.forEach(peek);
}
return list;
}
}
pjcloud-common/pjcloud-common-core/src/main/java/com/bsd/pjcloud/common/core/util/CollectionUtils.java
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package com.bsd.pjcloud.common.core.util;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.util.ArrayUtil;
import java.util.*;
import java.util.function.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Arrays.asList;
/**
* Collection 工具类
*
* @author 芋道源码
*/
public class CollectionUtils {
public static boolean containsAny(Object source, Object... targets) {
return asList(targets).contains(source);
}
public static boolean isAnyEmpty(Collection<?>... collections) {
return Arrays.stream(collections).anyMatch(CollectionUtil::isEmpty);
}
public static <T> boolean anyMatch(Collection<T> from, Predicate<T> predicate) {
return from.stream().anyMatch(predicate);
}
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(T[] from, Function<T, U> func) {
if (ArrayUtil.isEmpty(from)) {
return new ArrayList<>();
}
return convertList(Arrays.asList(from), func);
}
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> List<U> convertListByFlatMap(Collection<T> from,
Function<T, ? extends Stream<? extends U>> func) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return from.stream().filter(Objects::nonNull).flatMap(func).filter(Objects::nonNull).collect(Collectors.toList());
}
public static <T, U, R> List<R> convertListByFlatMap(Collection<T> from,
Function<? super T, ? extends U> mapper,
Function<U, ? extends Stream<? extends R>> func) {
if (CollUtil.isEmpty(from)) {
return new ArrayList<>();
}
return from.stream().map(mapper).filter(Objects::nonNull).flatMap(func).filter(Objects::nonNull).collect(Collectors.toList());
}
public static <K, V> List<V> mergeValuesFromMap(Map<K, List<V>> map) {
return map.values()
.stream()
.flatMap(List::stream)
.collect(Collectors.toList());
}
public static <T> Set<T> convertSet(Collection<T> from) {
return convertSet(from, v -> v);
}
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> convertMapByFilter(Collection<T> from, Predicate<T> filter, Function<T, K> keyFunc) {
if (CollUtil.isEmpty(from)) {
return new HashMap<>();
}
return from.stream().filter(filter).collect(Collectors.toMap(keyFunc, v -> v));
}
public static <T, U> Set<U> convertSetByFlatMap(Collection<T> from,
Function<T, ? extends Stream<? extends U>> func) {
if (CollUtil.isEmpty(from)) {
return new HashSet<>();
}
return from.stream().filter(Objects::nonNull).flatMap(func).filter(Objects::nonNull).collect(Collectors.toSet());
}
public static <T, U, R> Set<R> convertSetByFlatMap(Collection<T> from,
Function<? super T, ? extends U> mapper,
Function<U, ? extends Stream<? extends R>> func) {
if (CollUtil.isEmpty(from)) {
return new HashSet<>();
}
return from.stream().map(mapper).filter(Objects::nonNull).flatMap(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();
// }
/**
* 对比老、新两个列表，找出新增、修改、删除的数据
*
* @param oldList 老列表
* @param newList 新列表
* @param sameFunc 对比函数，返回 true 表示相同，返回 false 表示不同
* 注意，same 是通过每个元素的“标识”，判断它们是不是同一个数据
* @return [新增列表、修改列表、删除列表]
*/
public static <T> List<List<T>> diffList(Collection<T> oldList, Collection<T> newList,
BiFunction<T, T, Boolean> sameFunc) {
List<T> createList = new LinkedList<>(newList); // 默认都认为是新增的，后续会进行移除
List<T> updateList = new ArrayList<>();
List<T> deleteList = new ArrayList<>();
// 通过以 oldList 为主遍历，找出 updateList 和 deleteList
for (T oldObj : oldList) {
// 1. 寻找是否有匹配的
T foundObj = null;
for (Iterator<T> iterator = createList.iterator(); iterator.hasNext(); ) {
T newObj = iterator.next();
// 1.1 不匹配，则直接跳过
if (!sameFunc.apply(oldObj, newObj)) {
continue;
}
// 1.2 匹配，则移除，并结束寻找
iterator.remove();
foundObj = newObj;
break;
}
// 2. 匹配添加到 updateList；不匹配则添加到 deleteList 中
if (foundObj != null) {
updateList.add(foundObj);
} else {
deleteList.add(oldObj);
}
}
return asList(createList, updateList, deleteList);
}
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(Collection<T> from, Predicate<T> predicate) {
return findFirst(from, predicate, Function.identity());
}
public static <T, U> U findFirst(Collection<T> from, Predicate<T> predicate, Function<T, U> func) {
if (CollUtil.isEmpty(from)) {
return null;
}
return from.stream().filter(predicate).findFirst().map(func).orElse(null);
}
public static <T, V extends Comparable<? super V>> V getMaxValue(Collection<T> from, Function<T, V> valueFunc) {
if (CollUtil.isEmpty(from)) {
return null;
}
assert !from.isEmpty(); // 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) {
return getSumValue(from, valueFunc, accumulator, null);
}
public static <T, V extends Comparable<? super V>> V getSumValue(Collection<T> from, Function<T, V> valueFunc,
BinaryOperator<V> accumulator, V defaultValue) {
if (CollUtil.isEmpty(from)) {
return defaultValue;
}
assert !from.isEmpty(); // 断言，避免告警
return from.stream().map(valueFunc).filter(Objects::nonNull).reduce(accumulator).orElse(defaultValue);
}
public static <T> void addIfNotNull(Collection<T> coll, T item) {
if (item == null) {
return;
}
coll.add(item);
}
public static <T> Collection<T> singleton(T obj) {
return obj == null ? Collections.emptyList() : Collections.singleton(obj);
}
public static <T> List<T> newArrayList(List<List<T>> list) {
return list.stream().flatMap(Collection::stream).collect(Collectors.toList());
}
}