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src/share/classes/com/sun/tools/javac/util/ArrayUtils.java@c75be5bc5283 (annotated)

src/share/classes/com/sun/tools/javac/util/ArrayUtils.java

Tue, 09 Oct 2012 19:10:00 -0700

author

jjg

date

Tue, 09 Oct 2012 19:10:00 -0700

changeset 1357

c75be5bc5283

parent 1339

0e5899f09dab

child 1591

dc8b7aa7cef3

permissions

-rw-r--r--

8000663: clean up langtools imports
Reviewed-by: darcy

jjg@1339	1	/*
jjg@1339	2	* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
jjg@1339	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@1339	4	*
jjg@1339	5	* This code is free software; you can redistribute it and/or modify it
jjg@1339	6	* under the terms of the GNU General Public License version 2 only, as
jjg@1339	7	* published by the Free Software Foundation. Oracle designates this
jjg@1339	8	* particular file as subject to the "Classpath" exception as provided
jjg@1339	9	* by Oracle in the LICENSE file that accompanied this code.
jjg@1339	10	*
jjg@1339	11	* This code is distributed in the hope that it will be useful, but WITHOUT
jjg@1339	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@1339	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
jjg@1339	14	* version 2 for more details (a copy is included in the LICENSE file that
jjg@1339	15	* accompanied this code).
jjg@1339	16	*
jjg@1339	17	* You should have received a copy of the GNU General Public License version
jjg@1339	18	* 2 along with this work; if not, write to the Free Software Foundation,
jjg@1339	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@1339	20	*
jjg@1339	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jjg@1339	22	* or visit www.oracle.com if you need additional information or have any
jjg@1339	23	* questions.
jjg@1339	24	*/
jjg@1339	25
jjg@1339	26	package com.sun.tools.javac.util;
jjg@1339	27
jjg@1339	28	import java.lang.reflect.Array;
jjg@1339	29
jjg@1339	30	/** <p><b>This is NOT part of any supported API.
jjg@1339	31	* If you write code that depends on this, you do so at your own risk.
jjg@1339	32	* This code and its internal interfaces are subject to change or
jjg@1339	33	* deletion without notice.</b>
jjg@1339	34	*/
jjg@1339	35	public class ArrayUtils {
jjg@1339	36
jjg@1339	37	private static int calculateNewLength(int currentLength, int maxIndex) {
jjg@1339	38	while (currentLength < maxIndex + 1)
jjg@1339	39	currentLength = currentLength * 2;
jjg@1339	40	return currentLength;
jjg@1339	41	}
jjg@1339	42
jjg@1339	43	public static <T> T[] ensureCapacity(T[] array, int maxIndex) {
jjg@1339	44	if (maxIndex < array.length) {
jjg@1339	45	return array;
jjg@1339	46	} else {
jjg@1339	47	int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339	48	@SuppressWarnings("unchecked")
jjg@1339	49	T[] result = (T[]) Array.newInstance(array.getClass().getComponentType(), newLength);
jjg@1339	50	System.arraycopy(array, 0, result, 0, array.length);
jjg@1339	51	return result;
jjg@1339	52	}
jjg@1339	53	}
jjg@1339	54
jjg@1339	55	public static byte[] ensureCapacity(byte[] array, int maxIndex) {
jjg@1339	56	if (maxIndex < array.length) {
jjg@1339	57	return array;
jjg@1339	58	} else {
jjg@1339	59	int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339	60	byte[] result = new byte[newLength];
jjg@1339	61	System.arraycopy(array, 0, result, 0, array.length);
jjg@1339	62	return result;
jjg@1339	63	}
jjg@1339	64	}
jjg@1339	65
jjg@1339	66	public static char[] ensureCapacity(char[] array, int maxIndex) {
jjg@1339	67	if (maxIndex < array.length) {
jjg@1339	68	return array;
jjg@1339	69	} else {
jjg@1339	70	int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339	71	char[] result = new char[newLength];
jjg@1339	72	System.arraycopy(array, 0, result, 0, array.length);
jjg@1339	73	return result;
jjg@1339	74	}
jjg@1339	75	}
jjg@1339	76
jjg@1339	77	public static int[] ensureCapacity(int[] array, int maxIndex) {
jjg@1339	78	if (maxIndex < array.length) {
jjg@1339	79	return array;
jjg@1339	80	} else {
jjg@1339	81	int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339	82	int[] result = new int[newLength];
jjg@1339	83	System.arraycopy(array, 0, result, 0, array.length);
jjg@1339	84	return result;
jjg@1339	85	}
jjg@1339	86	}
jjg@1339	87	}