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The Apache Commons Codec component contains encoders and decoders for various formats such as Base16, Base32, Base64, digest, and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities. This is a port for GWT, which enables program, to use Apache Commons Codec also in the frontend compiled by the gwt compiler to java-script.

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/*
 * Copyright (C) 2012 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 java.nio.charset;

import java.util.Collections;
import java.util.SortedMap;
import java.util.TreeMap;

/**
 * A minimal GWT emulation of {@link Charset}.
 *
 * @author Gregory Kick
 */
public abstract class Charset implements Comparable {
  private static final Charset UTF_8 = new Charset("UTF-8") {};

  private static final SortedMap AVAILABLE_CHARSETS = new TreeMap<>();
  static {
    Charset.AVAILABLE_CHARSETS.put(Charset.UTF_8.name(), Charset.UTF_8);
  }

  public static SortedMap availableCharsets() {
    return Collections.unmodifiableSortedMap(Charset.AVAILABLE_CHARSETS);
  }

  public static Charset forName(final String charsetName) {
    if (charsetName == null) {
      throw new IllegalArgumentException("Null charset name");
    }
    final int length = charsetName.length();
    if (length == 0) {
      throw new IllegalCharsetNameException(charsetName);
    }
    for (int i = 0; i < length; i++) {
      final char c = charsetName.charAt(i);
      if (c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z' || c >= '0' && c <= '9' || c == '-' && i != 0
          || c == ':' && i != 0 || c == '_' && i != 0 || c == '.' && i != 0) {
        continue;
      }
      throw new IllegalCharsetNameException(charsetName);
    }
    final Charset charset = Charset.AVAILABLE_CHARSETS.get(charsetName.toUpperCase());
    if (charset != null) {
      return charset;
    }
    throw new UnsupportedCharsetException(charsetName);
  }

  private final String name;

  private Charset(final String name) {
    this.name = name;
  }

  protected Charset(final String name, final String[] aliasesIgnored) {
    this.name = name;
  }

  public final String name() {
    return this.name;
  }

  @Override
  public final int compareTo(final Charset that) {
    return this.name.compareToIgnoreCase(that.name);
  }

  @Override
  public final int hashCode() {
    return this.name.hashCode();
  }

  @Override
  public final boolean equals(final Object o) {
    if (o == this) {
      return true;
    } else if (o instanceof Charset) {
      final Charset that = (Charset) o;
      return this.name.equals(that.name);
    } else {
      return false;
    }
  }

  @Override
  public final String toString() {
    return this.name;
  }

  public static Charset defaultCharset() {
    return Charset.UTF_8;
  }
}