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}