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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.compress.utils;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
/**
* Charsets required of every implementation of the Java platform.
*
* From the Java documentation Standard
* charsets:
*
* Every implementation of the Java platform is required to support the following character encodings. Consult the
* release documentation for your implementation to see if any other encodings are supported. Consult the release
* documentation for your implementation to see if any other encodings are supported.
*
*
*
* US-ASCII- Seven-bit ASCII, a.k.a. ISO646-US, a.k.a. the Basic Latin block of the Unicode character set.
* ISO-8859-1- ISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1.
* UTF-8- Eight-bit Unicode Transformation Format.
* UTF-16BE- Sixteen-bit Unicode Transformation Format, big-endian byte order.
* UTF-16LE- Sixteen-bit Unicode Transformation Format, little-endian byte order.
* UTF-16- Sixteen-bit Unicode Transformation Format, byte order specified by a mandatory initial byte-order mark (either order
* accepted on input, big-endian used on output.)
*
*
* This class best belongs in the Commons Lang or IO project. Even if a similar class is defined in another Commons
* component, it is not foreseen that Commons Compress would be made to depend on another Commons component.
*
* @see Standard charsets
* @see StandardCharsets
* @since 1.4
*/
public class Charsets {
//
// This class should only contain Charset instances for required encodings. This guarantees that it will load correctly and
// without delay on all Java platforms.
//
/**
* Returns the given Charset or the default Charset if the given Charset is null.
*
* @param charset
* A charset or null.
* @return the given Charset or the default Charset if the given Charset is null
*/
public static Charset toCharset(final Charset charset) {
return charset == null ? Charset.defaultCharset() : charset;
}
/**
* Returns a Charset for the named charset. If the name is null, return the default Charset.
*
* @param charset
* The name of the requested charset, may be null.
* @return a Charset for the named charset
* @throws java.nio.charset.UnsupportedCharsetException
* If the named charset is unavailable
* @throws java.nio.charset.IllegalCharsetNameException
* If the given charset name is illegal
*/
public static Charset toCharset(final String charset) {
return charset == null ? Charset.defaultCharset() : Charset.forName(charset);
}
/**
* CharsetNamesISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1.
*
* Every implementation of the Java platform is required to support this character encoding.
*
*
* @see Standard charsets
* @deprecated replaced by {@link StandardCharsets} in Java 7
*/
public static final Charset ISO_8859_1 = StandardCharsets.ISO_8859_1;
/**
*
* Seven-bit ASCII, also known as ISO646-US, also known as the Basic Latin block of the Unicode character set.
*
*
* Every implementation of the Java platform is required to support this character encoding.
*
*
* @see Standard charsets
* @deprecated replaced by {@link StandardCharsets} in Java 7
*/
public static final Charset US_ASCII = StandardCharsets.US_ASCII;
/**
*
* Sixteen-bit Unicode Transformation Format, The byte order specified by a mandatory initial byte-order mark
* (either order accepted on input, big-endian used on output)
*
*
* Every implementation of the Java platform is required to support this character encoding.
*
*
* @see Standard charsets
* @deprecated replaced by {@link StandardCharsets} in Java 7
*/
public static final Charset UTF_16 = StandardCharsets.UTF_16;
/**
*
* Sixteen-bit Unicode Transformation Format, big-endian byte order.
*
*
* Every implementation of the Java platform is required to support this character encoding.
*
*
* @see Standard charsets
* @deprecated replaced by {@link StandardCharsets} in Java 7
*/
public static final Charset UTF_16BE = StandardCharsets.UTF_16BE;
/**
*
* Sixteen-bit Unicode Transformation Format, little-endian byte order.
*
*
* Every implementation of the Java platform is required to support this character encoding.
*
*
* @see Standard charsets
* @deprecated replaced by {@link StandardCharsets} in Java 7
*/
public static final Charset UTF_16LE = StandardCharsets.UTF_16LE;
/**
*
* Eight-bit Unicode Transformation Format.
*
*
* Every implementation of the Java platform is required to support this character encoding.
*
*
* @see Standard charsets
* @deprecated replaced by {@link StandardCharsets} in Java 7
*/
public static final Charset UTF_8 = StandardCharsets.UTF_8;
}