    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    }