001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.lang3;
019
020import java.nio.charset.Charset;
021import java.nio.charset.IllegalCharsetNameException;
022import java.nio.charset.StandardCharsets;
023
024/**
025 * Character encoding names required of every implementation of the Java platform.
026 *
027 * <p>According to <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html">JRE character
028 * encoding names</a>:</p>
029 *
030 * <p><cite>Every implementation of the Java platform is required to support the following character encodings.
031 * Consult the release documentation for your implementation to see if any other encodings are supported.
032 * </cite></p>
033 *
034 * @see <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/intl/encoding.doc.html">JRE character encoding names</a>
035 * @since 2.1
036 * @deprecated Java 7 introduced {@link java.nio.charset.StandardCharsets}, which defines these constants as
037 * {@link Charset} objects. Use {@link Charset#name()} to get the string values provided in this class.
038 * This class will be removed in a future release.
039 */
040@Deprecated
041public class CharEncoding {
042
043    /**
044     * ISO Latin Alphabet #1, also known as ISO-LATIN-1.
045     *
046     * <p>Every implementation of the Java platform is required to support this character encoding.</p>
047     */
048    public static final String ISO_8859_1 = StandardCharsets.ISO_8859_1.name();
049
050    /**
051     * Seven-bit ASCII, also known as ISO646-US, also known as the Basic Latin block
052     * of the Unicode character set.
053     *
054     * <p>Every implementation of the Java platform is required to support this character encoding.</p>
055     */
056    public static final String US_ASCII = StandardCharsets.US_ASCII.name();
057
058    /**
059     * Sixteen-bit Unicode Transformation Format, byte order specified by a mandatory initial
060     * byte-order mark (either order accepted on input, big-endian used on output).
061     *
062     * <p>Every implementation of the Java platform is required to support this character encoding.</p>
063     */
064    public static final String UTF_16 = StandardCharsets.UTF_16.name();
065
066    /**
067     * Sixteen-bit Unicode Transformation Format, big-endian byte order.
068     *
069     * <p>Every implementation of the Java platform is required to support this character encoding.</p>
070     */
071    public static final String UTF_16BE = StandardCharsets.UTF_16BE.name();
072
073    /**
074     * Sixteen-bit Unicode Transformation Format, little-endian byte order.
075     *
076     * <p>Every implementation of the Java platform is required to support this character encoding.</p>
077     */
078    public static final String UTF_16LE = StandardCharsets.UTF_16LE.name();
079
080    /**
081     * Eight-bit Unicode Transformation Format.
082     *
083     * <p>Every implementation of the Java platform is required to support this character encoding.</p>
084     */
085    public static final String UTF_8 = StandardCharsets.UTF_8.name();
086
087    /**
088     * Returns whether the named charset is supported.
089     *
090     * <p>This is similar to <a
091     * href="https://docs.oracle.com/javase/8/docs/api/java/nio/charset/Charset.html#isSupported%28java.lang.String%29">
092     * java.nio.charset.Charset.isSupported(String)</a> but handles more formats</p>
093     *
094     * @param name  the name of the requested charset; may be either a canonical name or an alias, null returns false
095     * @return {@code true} if the charset is available in the current Java virtual machine
096     * @deprecated Please use {@link Charset#isSupported(String)} instead, although be aware that {@code null}
097     * values are not accepted by that method and an {@link IllegalCharsetNameException} may be thrown.
098     */
099    @Deprecated
100    public static boolean isSupported(final String name) {
101        if (name == null) {
102            return false;
103        }
104        try {
105            return Charset.isSupported(name);
106        } catch (final IllegalCharsetNameException ex) {
107            return false;
108        }
109    }
110
111}