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     */
017    package org.apache.commons.math3.exception.util;
018    
019    import java.util.List;
020    import java.util.ArrayList;
021    
022    /**
023     * Utility class for transforming the list of arguments passed to
024     * constructors of exceptions.
025     *
026     * @version $Id: ArgUtils.java 1364388 2012-07-22 18:16:43Z tn $
027     */
028    public 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<Object>();
043            if (array != null) {
044                for (Object o : array) {
045                    if (o instanceof Object[]) {
046                        for (Object oR : flatten((Object[]) o)) {
047                            list.add(oR);
048                        }
049                    } else {
050                        list.add(o);
051                    }
052                }
053            }
054            return list.toArray();
055        }
056    }