001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.math4.exception.util;
018
019import java.util.Arrays;
020import java.util.List;
021import java.util.ArrayList;
022
023/**
024 * Utility class for transforming the list of arguments passed to
025 * constructors of exceptions.
026 *
027 */
028public class ArgUtils {
029    /**
030     * Class contains only static methods.
031     */
032    private ArgUtils() {}
033
034    /**
035     * Transform a multidimensional array into a one-dimensional list.
036     *
037     * @param array Array (possibly multidimensional).
038     * @return a list of all the {@code Object} instances contained in
039     * {@code array}.
040     */
041    public static Object[] flatten(Object[] array) {
042        final List<Object> list = new ArrayList<>();
043        if (array != null) {
044            for (Object o : array) {
045                if (o instanceof Object[]) {
046                    list.addAll(Arrays.asList(flatten((Object[]) o)));
047                } else {
048                    list.add(o);
049                }
050            }
051        }
052        return list.toArray();
053    }
054}