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 }