1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.math4.legacy.exception.util;
18
19 import java.util.Arrays;
20 import java.util.List;
21 import java.util.ArrayList;
22
23 /**
24 * Utility class for transforming the list of arguments passed to
25 * constructors of exceptions.
26 */
27 public final class ArgUtils {
28 /**
29 * Class contains only static methods.
30 */
31 private ArgUtils() {}
32
33 /**
34 * Transform a multidimensional array into a one-dimensional list.
35 *
36 * @param array Array (possibly multidimensional).
37 * @return a list of all the {@code Object} instances contained in
38 * {@code array}.
39 */
40 public static Object[] flatten(Object[] array) {
41 final List<Object> list = new ArrayList<>();
42 if (array != null) {
43 for (Object o : array) {
44 if (o instanceof Object[]) {
45 list.addAll(Arrays.asList(flatten((Object[]) o)));
46 } else {
47 list.add(o);
48 }
49 }
50 }
51 return list.toArray();
52 }
53 }