89 lines
3.3 KiB
Java
89 lines
3.3 KiB
Java
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.javac.util;
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import java.lang.reflect.Array;
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/** <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own risk.
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* This code and its internal interfaces are subject to change or
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* deletion without notice.</b>
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*/
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public class ArrayUtils {
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private static int calculateNewLength(int currentLength, int maxIndex) {
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while (currentLength < maxIndex + 1)
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currentLength = currentLength * 2;
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return currentLength;
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}
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public static <T> T[] ensureCapacity(T[] array, int maxIndex) {
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if (maxIndex < array.length) {
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return array;
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} else {
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int newLength = calculateNewLength(array.length, maxIndex);
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@SuppressWarnings("unchecked")
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T[] result = (T[]) Array.newInstance(array.getClass().getComponentType(), newLength);
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System.arraycopy(array, 0, result, 0, array.length);
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return result;
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}
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}
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public static byte[] ensureCapacity(byte[] array, int maxIndex) {
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if (maxIndex < array.length) {
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return array;
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} else {
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int newLength = calculateNewLength(array.length, maxIndex);
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byte[] result = new byte[newLength];
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System.arraycopy(array, 0, result, 0, array.length);
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return result;
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}
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}
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public static char[] ensureCapacity(char[] array, int maxIndex) {
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if (maxIndex < array.length) {
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return array;
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} else {
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int newLength = calculateNewLength(array.length, maxIndex);
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char[] result = new char[newLength];
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System.arraycopy(array, 0, result, 0, array.length);
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return result;
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}
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}
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public static int[] ensureCapacity(int[] array, int maxIndex) {
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if (maxIndex < array.length) {
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return array;
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} else {
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int newLength = calculateNewLength(array.length, maxIndex);
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int[] result = new int[newLength];
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System.arraycopy(array, 0, result, 0, array.length);
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return result;
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}
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}
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}
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