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 */ 017package org.apache.commons.math3.exception.util; 018 019import java.util.List; 020import java.util.ArrayList; 021 022/** 023 * Utility class for transforming the list of arguments passed to 024 * constructors of exceptions. 025 * 026 */ 027public class ArgUtils { 028 /** 029 * Class contains only static methods. 030 */ 031 private ArgUtils() {} 032 033 /** 034 * Transform a multidimensional array into a one-dimensional list. 035 * 036 * @param array Array (possibly multidimensional). 037 * @return a list of all the {@code Object} instances contained in 038 * {@code array}. 039 */ 040 public static Object[] flatten(Object[] array) { 041 final List<Object> list = new ArrayList<Object>(); 042 if (array != null) { 043 for (Object o : array) { 044 if (o instanceof Object[]) { 045 for (Object oR : flatten((Object[]) o)) { 046 list.add(oR); 047 } 048 } else { 049 list.add(o); 050 } 051 } 052 } 053 return list.toArray(); 054 } 055}