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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.codec;
+
+import java.nio.charset.Charset;
+
+/**
+ * Charsets required of every implementation of the Java platform.
+ *
+ * From the Java documentation <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard
+ * charsets</a>:
+ * <p>
+ * <cite>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. </cite>
+ * </p>
+ *
+ * <ul>
+ * <li><code>US-ASCII</code><br/>
+ * Seven-bit ASCII, a.k.a. ISO646-US, a.k.a. the Basic Latin block of the Unicode character set.</li>
+ * <li><code>ISO-8859-1</code><br/>
+ * ISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1.</li>
+ * <li><code>UTF-8</code><br/>
+ * Eight-bit Unicode Transformation Format.</li>
+ * <li><code>UTF-16BE</code><br/>
+ * Sixteen-bit Unicode Transformation Format, big-endian byte order.</li>
+ * <li><code>UTF-16LE</code><br/>
+ * Sixteen-bit Unicode Transformation Format, little-endian byte order.</li>
+ * <li><code>UTF-16</code><br/>
+ * 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.)</li>
+ * </ul>
+ *
+ * This perhaps would best belong in the Commons Lang project. Even if a similar class is defined in Commons Lang, it is
+ * not foreseen that Commons Codec would be made to depend on Commons Lang.
+ *
+ * <p>
+ * This class is immutable and thread-safe.
+ * </p>
+ *
+ * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+ * @since 1.7
+ * @version $Id: CharEncoding.java 1173287 2011-09-20 18:16:19Z ggregory $
+ */
+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
+     */
+    public static Charset toCharset(final String charset) {
+        return charset == null ? Charset.defaultCharset() : Charset.forName(charset);
+    }
+
+    /**
+     * CharEncodingISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1.
+     * <p>
+     * Every implementation of the Java platform is required to support this character encoding.
+     *
+     * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     */
+    public static final Charset ISO_8859_1 = Charset.forName(CharEncoding.ISO_8859_1);
+
+    /**
+     * Seven-bit ASCII, also known as ISO646-US, also known as the Basic Latin block of the Unicode character set.
+     * <p>
+     * Every implementation of the Java platform is required to support this character encoding.
+     *
+     * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     */
+    public static final Charset US_ASCII = Charset.forName(CharEncoding.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)
+     * <p>
+     * Every implementation of the Java platform is required to support this character encoding.
+     *
+     * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     */
+    public static final Charset UTF_16 = Charset.forName(CharEncoding.UTF_16);
+
+    /**
+     * Sixteen-bit Unicode Transformation Format, big-endian byte order.
+     * <p>
+     * Every implementation of the Java platform is required to support this character encoding.
+     *
+     * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     */
+    public static final Charset UTF_16BE = Charset.forName(CharEncoding.UTF_16BE);
+
+    /**
+     * Sixteen-bit Unicode Transformation Format, little-endian byte order.
+     * <p>
+     * Every implementation of the Java platform is required to support this character encoding.
+     *
+     * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     */
+    public static final Charset UTF_16LE = Charset.forName(CharEncoding.UTF_16LE);
+
+    /**
+     * Eight-bit Unicode Transformation Format.
+     * <p>
+     * Every implementation of the Java platform is required to support this character encoding.
+     *
+     * @see <a href="http://docs.oracle.com/javase/6/docs/api/java/nio/charset/Charset.html">Standard charsets</a>
+     */
+    public static final Charset UTF_8 = Charset.forName(CharEncoding.UTF_8);
+}