    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.math.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 $Revision$ $Date$
    027     * @since 2.2
    028     */
    029    public class ArgUtils {
    030        /**
    031         * Private constructor
    032         */
    033        private ArgUtils() {
    034        }
    035
    036        /**
    037         * Transform a multidimensional array into a one-dimensional list.
    038         *
    039         * @param array Array (possibly multidimensional).
    040         * @return a list of all the {@code Object} instances contained in
    041         * {@code array}.
    042         */
    043        public static Object[] flatten(Object[] array) {
    044            final List<Object> list = new ArrayList<Object>();
    045            if (array != null) {
    046                for (Object o : array) {
    047                    if (o instanceof Object[]) {
    048                        for (Object oR : flatten((Object[]) o)) {
    049                            list.add(oR);
    050                        }
    051                    } else {
    052                        list.add(o);
    053                    }
    054                }
    055            }
    056            return list.toArray();
    057        }
    058    }