com.gitee.feizns.ArrayUtils Maven / Gradle / Ivy

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package com.gitee.feizns;

import java.lang.reflect.Array;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Objects;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * 数组
 * @author feizns
 * @since 2019/5/13
 */
public abstract class ArrayUtils {

    /**
     * 查找第一个元素的下标
     * @param test
     * @param array
     * @return
     */
    public static  int findIndex(Predicate test, T... array) {
        if ( array != null ) {
            for (int i = 0; i < array.length; i++) {
                if ( test.test(array[i]) )
                    return i;
            }
        }
        return -1;
    }

    /**
     * @see ArrayUtils#findIndex(java.util.function.Predicate, java.lang.Object[])
     * @param test
     * @param array
     * @return
     */
    public static final  int indexOf(Predicate test, T... array) {
        return findIndex(test, array);
    }

    /**
     * 查找第一个元素
     * @param test
     * @param array
     * @return
     */
    public static  T findFirst(Predicate test, T... array) {
        int index = findIndex(test, array);
        return index != -1 ? array[index] : null;
    }

    /**
     * 将数组包装成iterator
     * @param ele
     * @param 
     * @return
     */
    public static  Iterator iterator(T... ele) {
        return ele != null ? Arrays.stream(ele).iterator() : null;
    }

    /**
     * 将数组包装成iterable
     * @param ele
     * @param 
     * @return
     */
    public static  Iterable iterable(T... ele) {
        return () -> iterator(ele);
    }

    /**
     * 数组是否为空
     * @param ele
     * @param 
     * @return
     */
    public static final  boolean isEmpty(T... ele) {
        return ele == null || ele.length == 0;
    }

    /**
     * 遍历一个未知的数组
     * @param array
     * @param consumer
     */
    public static final void forEach(Object array, Consumer