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001    /*
002     * Copyright (C) 2007 The Guava Authors
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package com.google.common.base;
018    
019    import java.nio.charset.Charset;
020    
021    /**
022     * Contains constant definitions for the six standard {@link Charset} instances, which are
023     * guaranteed to be supported by all Java platform implementations.
024     *
025     * @author Mike Bostock
026     * @since 1.0
027     */
028    public final class Charsets {
029      private Charsets() {}
030    
031      /**
032       * US-ASCII: seven-bit ASCII, the Basic Latin block of the Unicode character set (ISO646-US).
033       */
034      public static final Charset US_ASCII = Charset.forName("US-ASCII");
035    
036      /**
037       * ISO-8859-1: ISO Latin Alphabet Number 1 (ISO-LATIN-1).
038       */
039      public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");
040    
041      /**
042       * UTF-8: eight-bit UCS Transformation Format.
043       */
044      public static final Charset UTF_8 = Charset.forName("UTF-8");
045    
046      /**
047       * UTF-16BE: sixteen-bit UCS Transformation Format, big-endian byte order.
048       */
049      public static final Charset UTF_16BE = Charset.forName("UTF-16BE");
050    
051      /**
052       * UTF-16LE: sixteen-bit UCS Transformation Format, little-endian byte order.
053       */
054      public static final Charset UTF_16LE = Charset.forName("UTF-16LE");
055    
056      /**
057       * UTF-16: sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order
058       * mark.
059       */
060      public static final Charset UTF_16 = Charset.forName("UTF-16");
061    
062      /*
063       * Please do not add new Charset references to this class, unless those character encodings are
064       * part of the set required to be supported by all Java platform implementations! Any Charsets
065       * initialized here may cause unexpected delays when this class is loaded. See the Charset
066       * Javadocs for the list of built-in character encodings.
067       */
068    }