001/* 002 * nimbus-jose-jwt 003 * 004 * Copyright 2012-2016, Connect2id Ltd. 005 * 006 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use 007 * this file except in compliance with the License. You may obtain a copy of the 008 * License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software distributed 013 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 014 * CONDITIONS OF ANY KIND, either express or implied. See the License for the 015 * specific language governing permissions and limitations under the License. 016 */ 017 018package com.nimbusds.jose.util; 019 020 021import java.util.Arrays; 022 023 024/** 025 * Array utilities. 026 */ 027public class ArrayUtils { 028 029 030 /** 031 * Concatenates the specified arrays. 032 * 033 * @param first The first array. Must not be {@code null}. 034 * @param rest The remaining arrays. 035 * @param <T> The array type. 036 * 037 * @return The resulting array. 038 */ 039 public static <T> T[] concat(final T[] first, final T[]... rest) { 040 int totalLength = first.length; 041 for (T[] array : rest) { 042 totalLength += array.length; 043 } 044 T[] result = Arrays.copyOf(first, totalLength); 045 int offset = first.length; 046 for (T[] array : rest) { 047 System.arraycopy(array, 0, result, offset, array.length); 048 offset += array.length; 049 } 050 return result; 051 } 052 053 054 /** 055 * Prevents public instantiation. 056 */ 057 private ArrayUtils() { 058 } 059}