jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/util/ArrayUtils.java@dc8b7aa7cef3

     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  */

    26 package com.sun.tools.javac.util;

    28 import java.lang.reflect.Array;

    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 {

    37     private static int calculateNewLength(int currentLength, int maxIndex) {

    38         while (currentLength < maxIndex + 1)

    39             currentLength = currentLength * 2;

    40         return currentLength;

    41     }

    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     }

    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     }

    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     }

    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     }

    88     public static <T> T[] concat(T[] anArr, T[] anotherArr) {

    89         int newLength = anArr.length + anotherArr.length;

    90         @SuppressWarnings("unchecked")

    91         T[] result = (T[]) Array.newInstance(anArr.getClass().getComponentType(), newLength);

    92         System.arraycopy(anArr, 0, result, 0, anArr.length);

    93         System.arraycopy(anotherArr, 0, result, anArr.length, anotherArr.length);

    94         return result;

    95     }

    97     @SuppressWarnings("unchecked")

    98     public static <T> T[] concatOpen(T[] anArr, T... anotherArr) {

    99         return concat(anArr, anotherArr);

   100     }

   101 }

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