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.legacy.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 */
027public final class ArgUtils {
028    /**
029     * Class contains only static methods.
030     */
031    private ArgUtils() {}
032
033    /**
034     * Transform a multidimensional array into a one-dimensional list.
035     *
036     * @param array Array (possibly multidimensional).
037     * @return a list of all the {@code Object} instances contained in
038     * {@code array}.
039     */
040    public static Object[] flatten(Object[] array) {
041        final List<Object> list = new ArrayList<>();
042        if (array != null) {
043            for (Object o : array) {
044                if (o instanceof Object[]) {
045                    list.addAll(Arrays.asList(flatten((Object[]) o)));
046                } else {
047                    list.add(o);
048                }
049            }
050        }
051        return list.toArray();
052    }
053}