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/*
 * Copyright (C) 2007 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;

import java.nio.charset.Charset;

/**
 * Contains constant definitions for the six standard {@link Charset} instances, which are
 * guaranteed to be supported by all Java platform implementations.
 *
 * Assuming you're free to choose, note that {@link #UTF_8} is widely preferred.
 *
 * 
See the Guava User Guide article on 
 * {@code Charsets}.
 *
 * @author Mike Bostock
 * @since 1.0
 */
@GwtCompatible(emulated = true)
public final class Charsets {
  private Charsets() {}

  /**
   * US-ASCII: seven-bit ASCII, the Basic Latin block of the Unicode character set (ISO646-US).
   *
   * 
Note for Java 7 and later: this constant should be treated as deprecated; use
   * {@link java.nio.charset.StandardCharsets#US_ASCII} instead.
   *
   */
  @GwtIncompatible("Non-UTF-8 Charset")
  public static final Charset US_ASCII = Charset.forName("US-ASCII");

  /**
   * ISO-8859-1: ISO Latin Alphabet Number 1 (ISO-LATIN-1).
   *
   * 
Note for Java 7 and later: this constant should be treated as deprecated; use
   * {@link java.nio.charset.StandardCharsets#ISO_8859_1} instead.
   *
   */
  @GwtIncompatible("Non-UTF-8 Charset")
  public static final Charset ISO_8859_1 = Charset.forName("ISO-8859-1");

  /**
   * UTF-8: eight-bit UCS Transformation Format.
   *
   * 
Note for Java 7 and later: this constant should be treated as deprecated; use
   * {@link java.nio.charset.StandardCharsets#UTF_8} instead.
   *
   */
  public static final Charset UTF_8 = Charset.forName("UTF-8");

  /**
   * UTF-16BE: sixteen-bit UCS Transformation Format, big-endian byte order.
   *
   * 
Note for Java 7 and later: this constant should be treated as deprecated; use
   * {@link java.nio.charset.StandardCharsets#UTF_16BE} instead.
   *
   */
  @GwtIncompatible("Non-UTF-8 Charset")
  public static final Charset UTF_16BE = Charset.forName("UTF-16BE");

  /**
   * UTF-16LE: sixteen-bit UCS Transformation Format, little-endian byte order.
   *
   * 
Note for Java 7 and later: this constant should be treated as deprecated; use
   * {@link java.nio.charset.StandardCharsets#UTF_16LE} instead.
   *
   */
  @GwtIncompatible("Non-UTF-8 Charset")
  public static final Charset UTF_16LE = Charset.forName("UTF-16LE");

  /**
   * UTF-16: sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order
   * mark.
   *
   * Note for Java 7 and later: this constant should be treated as deprecated; use
   * {@link java.nio.charset.StandardCharsets#UTF_16} instead.
   *
   */
  @GwtIncompatible("Non-UTF-8 Charset")
  public static final Charset UTF_16 = Charset.forName("UTF-16");

  /*
   * Please do not add new Charset references to this class, unless those character encodings are
   * part of the set required to be supported by all Java platform implementations! Any Charsets
   * initialized here may cause unexpected delays when this class is loaded. See the Charset
   * Javadocs for the list of built-in character encodings.
   */
}