1 /* 2 * Copyright (c) 2000, 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 */ 25 26 package java.nio; 27 28 // Android-removed: Use Bits class to retrieve byte order. 29 // import jdk.internal.misc.Unsafe; 30 31 /** 32 * A typesafe enumeration for byte orders. 33 * 34 * @author Mark Reinhold 35 * @author JSR-51 Expert Group 36 * @since 1.4 37 */ 38 39 public final class ByteOrder { 40 41 private String name; 42 ByteOrder(String name)43 private ByteOrder(String name) { 44 this.name = name; 45 } 46 47 /** 48 * Constant denoting big-endian byte order. In this order, the bytes of a 49 * multibyte value are ordered from most significant to least significant. 50 */ 51 public static final ByteOrder BIG_ENDIAN 52 = new ByteOrder("BIG_ENDIAN"); 53 54 /** 55 * Constant denoting little-endian byte order. In this order, the bytes of 56 * a multibyte value are ordered from least significant to most 57 * significant. 58 */ 59 public static final ByteOrder LITTLE_ENDIAN 60 = new ByteOrder("LITTLE_ENDIAN"); 61 62 // BEGIN Android-removed: Use Bits class to retrieve native order. 63 /* 64 // Retrieve the native byte order. It's used early during bootstrap, and 65 // must be initialized after BIG_ENDIAN and LITTLE_ENDIAN. 66 private static final ByteOrder NATIVE_ORDER 67 = Unsafe.getUnsafe().isBigEndian() 68 ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN; 69 */ 70 // END Android-removed: Use Bits class to retrieve native order. 71 72 /** 73 * Retrieves the native byte order of the underlying platform. 74 * 75 * <p> This method is defined so that performance-sensitive Java code can 76 * allocate direct buffers with the same byte order as the hardware. 77 * Native code libraries are often more efficient when such buffers are 78 * used. </p> 79 * 80 * @return The native byte order of the hardware upon which this Java 81 * virtual machine is running 82 */ nativeOrder()83 public static ByteOrder nativeOrder() { 84 // BEGIN Android-changed: Use Bits class to retrieve byte order. 85 /* 86 return NATIVE_ORDER; 87 */ 88 // END Android-changed: Use Bits class to retrieve byte order. 89 return Bits.byteOrder(); 90 } 91 92 /** 93 * Constructs a string describing this object. 94 * 95 * <p> This method returns the string 96 * {@code "BIG_ENDIAN"} for {@link #BIG_ENDIAN} and 97 * {@code "LITTLE_ENDIAN"} for {@link #LITTLE_ENDIAN}. 98 * 99 * @return The specified string 100 */ toString()101 public String toString() { 102 return name; 103 } 104 105 } 106