Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: src/share/classes/com/sun/tools/javac/util/ArrayUtils.java
src/share/classes/com/sun/tools/javac/util/ArrayUtils.java
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- 2eb010b6cb22
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| 1 /* | |
| 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. Oracle designates this | |
| 8 * particular file as subject to the "Classpath" exception as provided | |
| 9 * by Oracle in the LICENSE file that accompanied this code. | |
| 10 * | |
| 11 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 * accompanied this code). | |
| 16 * | |
| 17 * You should have received a copy of the GNU General Public License version | |
| 18 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 * | |
| 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 * or visit www.oracle.com if you need additional information or have any | |
| 23 * questions. | |
| 24 */ | |
| 25 | |
| 26 package com.sun.tools.javac.util; | |
| 27 | |
| 28 import java.lang.reflect.Array; | |
| 29 | |
| 30 /** <p><b>This is NOT part of any supported API. | |
| 31 * If you write code that depends on this, you do so at your own risk. | |
| 32 * This code and its internal interfaces are subject to change or | |
| 33 * deletion without notice.</b> | |
| 34 */ | |
| 35 public class ArrayUtils { | |
| 36 | |
| 37 private static int calculateNewLength(int currentLength, int maxIndex) { | |
| 38 while (currentLength < maxIndex + 1) | |
| 39 currentLength = currentLength * 2; | |
| 40 return currentLength; | |
| 41 } | |
| 42 | |
| 43 public static <T> T[] ensureCapacity(T[] array, int maxIndex) { | |
| 44 if (maxIndex < array.length) { | |
| 45 return array; | |
| 46 } else { | |
| 47 int newLength = calculateNewLength(array.length, maxIndex); | |
| 48 @SuppressWarnings("unchecked") | |
| 49 T[] result = (T[]) Array.newInstance(array.getClass().getComponentType(), newLength); | |
| 50 System.arraycopy(array, 0, result, 0, array.length); | |
| 51 return result; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 public static byte[] ensureCapacity(byte[] array, int maxIndex) { | |
| 56 if (maxIndex < array.length) { | |
| 57 return array; | |
| 58 } else { | |
| 59 int newLength = calculateNewLength(array.length, maxIndex); | |
| 60 byte[] result = new byte[newLength]; | |
| 61 System.arraycopy(array, 0, result, 0, array.length); | |
| 62 return result; | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 public static char[] ensureCapacity(char[] array, int maxIndex) { | |
| 67 if (maxIndex < array.length) { | |
| 68 return array; | |
| 69 } else { | |
| 70 int newLength = calculateNewLength(array.length, maxIndex); | |
| 71 char[] result = new char[newLength]; | |
| 72 System.arraycopy(array, 0, result, 0, array.length); | |
| 73 return result; | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 public static int[] ensureCapacity(int[] array, int maxIndex) { | |
| 78 if (maxIndex < array.length) { | |
| 79 return array; | |
| 80 } else { | |
| 81 int newLength = calculateNewLength(array.length, maxIndex); | |
| 82 int[] result = new int[newLength]; | |
| 83 System.arraycopy(array, 0, result, 0, array.length); | |
| 84 return result; | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 } |
