jjg@1339: /*
vromero@1591:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
jjg@1339:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@1339:  *
jjg@1339:  * This code is free software; you can redistribute it and/or modify it
jjg@1339:  * under the terms of the GNU General Public License version 2 only, as
jjg@1339:  * published by the Free Software Foundation.  Oracle designates this
jjg@1339:  * particular file as subject to the "Classpath" exception as provided
jjg@1339:  * by Oracle in the LICENSE file that accompanied this code.
jjg@1339:  *
jjg@1339:  * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@1339:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@1339:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jjg@1339:  * version 2 for more details (a copy is included in the LICENSE file that
jjg@1339:  * accompanied this code).
jjg@1339:  *
jjg@1339:  * You should have received a copy of the GNU General Public License version
jjg@1339:  * 2 along with this work; if not, write to the Free Software Foundation,
jjg@1339:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@1339:  *
jjg@1339:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
jjg@1339:  * or visit www.oracle.com if you need additional information or have any
jjg@1339:  * questions.
jjg@1339:  */
jjg@1339: 
jjg@1339: package com.sun.tools.javac.util;
jjg@1339: 
jjg@1339: import java.lang.reflect.Array;
jjg@1339: 
jjg@1339: /** <p><b>This is NOT part of any supported API.
jjg@1339:  *  If you write code that depends on this, you do so at your own risk.
jjg@1339:  *  This code and its internal interfaces are subject to change or
jjg@1339:  *  deletion without notice.</b>
jjg@1339:  */
jjg@1339: public class ArrayUtils {
jjg@1339: 
jjg@1339:     private static int calculateNewLength(int currentLength, int maxIndex) {
jjg@1339:         while (currentLength < maxIndex + 1)
jjg@1339:             currentLength = currentLength * 2;
jjg@1339:         return currentLength;
jjg@1339:     }
jjg@1339: 
jjg@1339:     public static <T> T[] ensureCapacity(T[] array, int maxIndex) {
jjg@1339:         if (maxIndex < array.length) {
jjg@1339:             return array;
jjg@1339:         } else {
jjg@1339:             int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339:             @SuppressWarnings("unchecked")
jjg@1339:             T[] result = (T[]) Array.newInstance(array.getClass().getComponentType(), newLength);
jjg@1339:             System.arraycopy(array, 0, result, 0, array.length);
jjg@1339:             return result;
jjg@1339:         }
jjg@1339:     }
jjg@1339: 
jjg@1339:     public static byte[] ensureCapacity(byte[] array, int maxIndex) {
jjg@1339:         if (maxIndex < array.length) {
jjg@1339:             return array;
jjg@1339:         } else {
jjg@1339:             int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339:             byte[] result = new byte[newLength];
jjg@1339:             System.arraycopy(array, 0, result, 0, array.length);
jjg@1339:             return result;
jjg@1339:         }
jjg@1339:     }
jjg@1339: 
jjg@1339:     public static char[] ensureCapacity(char[] array, int maxIndex) {
jjg@1339:         if (maxIndex < array.length) {
jjg@1339:             return array;
jjg@1339:         } else {
jjg@1339:             int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339:             char[] result = new char[newLength];
jjg@1339:             System.arraycopy(array, 0, result, 0, array.length);
jjg@1339:             return result;
jjg@1339:         }
jjg@1339:     }
jjg@1339: 
jjg@1339:     public static int[] ensureCapacity(int[] array, int maxIndex) {
jjg@1339:         if (maxIndex < array.length) {
jjg@1339:             return array;
jjg@1339:         } else {
jjg@1339:             int newLength = calculateNewLength(array.length, maxIndex);
jjg@1339:             int[] result = new int[newLength];
jjg@1339:             System.arraycopy(array, 0, result, 0, array.length);
jjg@1339:             return result;
jjg@1339:         }
jjg@1339:     }
vromero@1591: 
jjg@1339: }