1   /*
2    * Copyright (C) 2007 The Guava Authors
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    * http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package com.google.common.base;
18  
19  import com.google.common.annotations.GwtCompatible;
20  
21  import java.nio.charset.Charset;
22  
23  /**
24   * Contains constant definitions for the six standard {@link Charset} instances, which are
25   * guaranteed to be supported by all Java platform implementations.
26   *
27   * <p>Assuming you're free to choose, note that <b>{@link #UTF_8} is widely preferred</b>.
28   *
29   * <p>See the Guava User Guide article on <a
30   * href="http://code.google.com/p/guava-libraries/wiki/StringsExplained#Charsets">
31   * {@code Charsets}</a>.
32   *
33   * @author Mike Bostock
34   * @since 1.0
35   */
36  @GwtCompatible(emulated = true)
37  public final class Charsets {
38    private Charsets() {}
39  
40    /**
41     * UTF-8: eight-bit UCS Transformation Format.
42     *
43     * <p><b>Note for Java 7 and later:</b> this constant should be treated as deprecated; use
44     * {@link java.nio.charset.StandardCharsets#UTF_8} instead.
45     *
46     */
47    public static final Charset UTF_8 = Charset.forName("UTF-8");
48  
49    /*
50     * Please do not add new Charset references to this class, unless those character encodings are
51     * part of the set required to be supported by all Java platform implementations! Any Charsets
52     * initialized here may cause unexpected delays when this class is loaded. See the Charset
53     * Javadocs for the list of built-in character encodings.
54     */
55  }