001/*******************************************************************************
002 * This software is provided as a supplement to the authors' textbooks on digital
003 * image processing published by Springer-Verlag in various languages and editions.
004 * Permission to use and distribute this software is granted under the BSD 2-Clause
005 * "Simplified" License (see http://opensource.org/licenses/BSD-2-Clause).
006 * Copyright (c) 2006-2023 Wilhelm Burger, Mark J. Burge. All rights reserved.
007 * Visit https://imagingbook.com for additional details.
008 ******************************************************************************/
009package imagingbook.common.util;
010
011import java.util.Arrays;
012import java.util.Iterator;
013
014/**
015 * @author WB
016 * @version 2022/11/20
017 *
018 */
019public abstract class ArrayUtils {
020        
021        private ArrayUtils() {}
022        
023        /**
024         * Counts the number of non-null elements in the given (non-primitive) array.
025         * @param arr an array of non-primitive type
026         * @return the number of non-null elements
027         */
028        public static int countNonNullElements(Object[] arr) {
029                int cnt = 0;
030                for (int i = 0; i < arr.length; i++) {
031                        if (arr[i] != null) {
032                                cnt++;
033                        }
034                }
035                return cnt;
036        }
037
038        /**
039         * Returns an iterator for the specified (non-primitive) array. The resulting iterator does not implement
040         * {@link Iterator#remove()}.
041         *
042         * @param <T> the generic element type
043         * @param array a non-primitive array
044         * @return the associated iterator
045         */
046        public static <T> Iterator<T> getIterator(T[] array) {
047                return Arrays.stream(array).iterator();
048        }
049}