| 提交 | 用户 | 时间 | ||
| e7c126 | 1 | package com.iailab.framework.common.util.collection; |
| H | 2 | |
| 3 | import cn.hutool.core.collection.CollectionUtil; | |
| 4 | import cn.hutool.core.collection.IterUtil; | |
| 5 | import cn.hutool.core.util.ArrayUtil; | |
| 6 | ||
| 7 | import java.util.Collection; | |
| 8 | import java.util.function.Consumer; | |
| 9 | import java.util.function.Function; | |
| 10 | ||
| 11 | import static com.iailab.framework.common.util.collection.CollectionUtils.convertList; | |
| 12 | ||
| 13 | /** | |
| 14 | * Array 工具类 | |
| 15 | * | |
| 16 | * @author iailab | |
| 17 | */ | |
| 18 | public class ArrayUtils { | |
| 19 | ||
| 20 | /** | |
| 21 | * 将 object 和 newElements 合并成一个数组 | |
| 22 | * | |
| 23 | * @param object 对象 | |
| 24 | * @param newElements 数组 | |
| 25 | * @param <T> 泛型 | |
| 26 | * @return 结果数组 | |
| 27 | */ | |
| 28 | @SafeVarargs | |
| 29 | public static <T> Consumer<T>[] append(Consumer<T> object, Consumer<T>... newElements) { | |
| 30 | if (object == null) { | |
| 31 | return newElements; | |
| 32 | } | |
| 33 | Consumer<T>[] result = ArrayUtil.newArray(Consumer.class, 1 + newElements.length); | |
| 34 | result[0] = object; | |
| 35 | System.arraycopy(newElements, 0, result, 1, newElements.length); | |
| 36 | return result; | |
| 37 | } | |
| 38 | ||
| 39 | public static <T, V> V[] toArray(Collection<T> from, Function<T, V> mapper) { | |
| 40 | return toArray(convertList(from, mapper)); | |
| 41 | } | |
| 42 | ||
| 43 | @SuppressWarnings("unchecked") | |
| 44 | public static <T> T[] toArray(Collection<T> from) { | |
| 45 | if (CollectionUtil.isEmpty(from)) { | |
| 46 | return (T[]) (new Object[0]); | |
| 47 | } | |
| 48 | return ArrayUtil.toArray(from, (Class<T>) IterUtil.getElementType(from.iterator())); | |
| 49 | } | |
| 50 | ||
| 51 | public static <T> T get(T[] array, int index) { | |
| 52 | if (null == array || index >= array.length) { | |
| 53 | return null; | |
| 54 | } | |
| 55 | return array[index]; | |
| 56 | } | |
| 57 | ||
| 58 | } | |
