1 /* 2 * Copyright (C) 2007 The Guava Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 5 * in compliance with the License. You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software distributed under the License 10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 11 * or implied. See the License for the specific language governing permissions and limitations under 12 * the License. 13 */ 14 15 package com.google.common.base; 16 17 import com.google.common.annotations.GwtCompatible; 18 import com.google.common.annotations.GwtIncompatible; 19 import com.google.common.annotations.J2ktIncompatible; 20 import java.nio.charset.Charset; 21 22 /** 23 * Contains constant definitions for the six standard {@link Charset} instances, which are 24 * guaranteed to be supported by all Java platform implementations. 25 * 26 * <p>Assuming you're free to choose, note that <b>{@link #UTF_8} is widely preferred</b>. 27 * 28 * <p>See the Guava User Guide article on <a 29 * href="https://github.com/google/guava/wiki/StringsExplained#charsets">{@code Charsets}</a>. 30 * 31 * @author Mike Bostock 32 * @since 1.0 33 */ 34 @GwtCompatible(emulated = true) 35 @ElementTypesAreNonnullByDefault 36 public final class Charsets { Charsets()37 private Charsets() {} 38 39 /** 40 * US-ASCII: seven-bit ASCII, the Basic Latin block of the Unicode character set (ISO646-US). 41 * 42 * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use {@link 43 * java.nio.charset.StandardCharsets#US_ASCII} instead. 44 * 45 */ 46 @J2ktIncompatible 47 @GwtIncompatible // Charset not supported by GWT 48 public static final Charset US_ASCII = Charset.forName("US-ASCII"); 49 50 /** 51 * ISO-8859-1: ISO Latin Alphabet Number 1 (ISO-LATIN-1). 52 * 53 * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use {@link 54 * java.nio.charset.StandardCharsets#ISO_8859_1} instead. 55 * 56 */ 57 public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1"); 58 59 /** 60 * UTF-8: eight-bit UCS Transformation Format. 61 * 62 * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use {@link 63 * java.nio.charset.StandardCharsets#UTF_8} instead. 64 * 65 */ 66 public static final Charset UTF_8 = Charset.forName("UTF-8"); 67 68 /** 69 * UTF-16BE: sixteen-bit UCS Transformation Format, big-endian byte order. 70 * 71 * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use {@link 72 * java.nio.charset.StandardCharsets#UTF_16BE} instead. 73 * 74 */ 75 @J2ktIncompatible 76 @GwtIncompatible // Charset not supported by GWT 77 public static final Charset UTF_16BE = Charset.forName("UTF-16BE"); 78 79 /** 80 * UTF-16LE: sixteen-bit UCS Transformation Format, little-endian byte order. 81 * 82 * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use {@link 83 * java.nio.charset.StandardCharsets#UTF_16LE} instead. 84 * 85 */ 86 @J2ktIncompatible 87 @GwtIncompatible // Charset not supported by GWT 88 public static final Charset UTF_16LE = Charset.forName("UTF-16LE"); 89 90 /** 91 * UTF-16: sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order 92 * mark. 93 * 94 * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use {@link 95 * java.nio.charset.StandardCharsets#UTF_16} instead. 96 * 97 */ 98 @J2ktIncompatible 99 @GwtIncompatible // Charset not supported by GWT 100 public static final Charset UTF_16 = Charset.forName("UTF-16"); 101 102 /* 103 * Please do not add new Charset references to this class, unless those character encodings are 104 * part of the set required to be supported by all Java platform implementations! Any Charsets 105 * initialized here may cause unexpected delays when this class is loaded. See the Charset 106 * Javadocs for the list of built-in character encodings. 107 */ 108 } 109