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package cn.hippo4j.starter.toolkit;

import java.lang.reflect.Array;

/**
 * Array util.
 *
 * @author chen.ma
 * @date 2021/7/5 21:54
 */
public class ArrayUtil {

    public static  T[] addAll(final T[] array1, @SuppressWarnings("unchecked") final T... array2) {
        if (array1 == null) {
            return clone(array2);
        } else if (array2 == null) {
            return clone(array1);
        }
        final Class type1 = array1.getClass().getComponentType();
        @SuppressWarnings("unchecked") final T[] joinedArray = (T[]) Array.newInstance(type1, array1.length + array2.length);
        System.arraycopy(array1, 0, joinedArray, 0, array1.length);
        try {
            System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);
        } catch (final ArrayStoreException ase) {
            final Class type2 = array2.getClass().getComponentType();
            if (!type1.isAssignableFrom(type2)) {
                throw new IllegalArgumentException("Cannot store " + type2.getName() + " in an array of "
                        + type1.getName(), ase);
            }
            throw ase;
        }
        return joinedArray;
    }

    public static  T[] clone(final T[] array) {
        if (array == null) {
            return null;
        }
        return array.clone();
    }

}