| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package java.io; |
| |
| import static javaemul.internal.InternalPreconditions.checkNotNull; |
| |
| /** |
| * Provides a series of utilities to be reused between IO classes. |
| * |
| * TODO(chehayeb): move these checks to InternalPreconditions. |
| */ |
| final class IOUtils { |
| |
| /** |
| * Validates the offset and the byte count for the given array of bytes. |
| * |
| * @param buffer Array of bytes to be checked. |
| * @param byteOffset Starting offset in the array. |
| * @param byteCount Total number of bytes to be accessed. |
| * @throws NullPointerException if the given reference to the buffer is null. |
| * @throws IndexOutOfBoundsException if {@code byteOffset} is negative, {@code byteCount} is |
| * negative or their sum exceeds the buffer length. |
| */ |
| public static void checkOffsetAndCount(byte[] buffer, int byteOffset, int byteCount) { |
| // Ensure we throw a NullPointerException instead of a JavascriptException in case the |
| // given buffer is null. |
| checkNotNull(buffer); |
| checkOffsetAndCount(buffer.length, byteOffset, byteCount); |
| } |
| |
| /** |
| * Validates the offset and the byte count for the given array of characters. |
| * |
| * @param buffer Array of characters to be checked. |
| * @param charOffset Starting offset in the array. |
| * @param charCount Total number of characters to be accessed. |
| * @throws NullPointerException if the given reference to the buffer is null. |
| * @throws IndexOutOfBoundsException if {@code charOffset} is negative, {@code charCount} is |
| * negative or their sum exceeds the buffer length. |
| */ |
| public static void checkOffsetAndCount(char[] buffer, int charOffset, int charCount) { |
| // Ensure we throw a NullPointerException instead of a JavascriptException in case the |
| // given buffer is null. |
| checkNotNull(buffer); |
| checkOffsetAndCount(buffer.length, charOffset, charCount); |
| } |
| |
| /** |
| * Validates the offset and the byte count for the given string. |
| * |
| * @param str String to be checked. |
| * @param offset Starting offset in the string. |
| * @param count Total number of characters to be accessed. |
| * @throws NullPointerException if the given reference to the string is null. |
| * @throws IndexOutOfBoundsException if {@code offset} is negative, {@code count} is |
| * negative or their sum exceeds the string length. |
| */ |
| public static void checkOffsetAndCount(String str, int offset, int count) { |
| // Ensure we throw a NullPointerException instead of a JavascriptException in case the |
| // given string is null. |
| checkNotNull(str); |
| checkOffsetAndCount(str.length(), offset, count); |
| } |
| |
| /** |
| * Validates the offset and the byte count for the given array length. |
| * |
| * @param length Length of the array to be checked. |
| * @param offset Starting offset in the array. |
| * @param count Total number of elements to be accessed. |
| * @throws IndexOutOfBoundsException if {@code offset} is negative, {@code count} is negative or |
| * their sum exceeds the given {@code length}. |
| */ |
| private static void checkOffsetAndCount(int length, int offset, int count) { |
| if ((offset < 0) || (count < 0) || ((offset + count) > length)) { |
| throw new IndexOutOfBoundsException(); |
| } |
| } |
| |
| private IOUtils() { |
| } |
| } |