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: /**
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.
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[] 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:
vromero@1591: public static T[] concat(T[] anArr, T[] anotherArr) {
vromero@1591: int newLength = anArr.length + anotherArr.length;
vromero@1591: @SuppressWarnings("unchecked")
vromero@1591: T[] result = (T[]) Array.newInstance(anArr.getClass().getComponentType(), newLength);
vromero@1591: System.arraycopy(anArr, 0, result, 0, anArr.length);
vromero@1591: System.arraycopy(anotherArr, 0, result, anArr.length, anotherArr.length);
vromero@1591: return result;
vromero@1591: }
vromero@1591:
vromero@1591: @SuppressWarnings("unchecked")
vromero@1591: public static T[] concatOpen(T[] anArr, T... anotherArr) {
vromero@1591: return concat(anArr, anotherArr);
vromero@1591: }
jjg@1339: }