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 }