Examples of java.nio.charset.CharsetDecoder

java.nio.charset.CharsetDecoder
An converter that can convert bytes sequence in some charset to 16-bit Unicode character sequence.
The input byte sequence is wrapped by {@link java.nio.ByteBuffer ByteBuffer}and the output character sequence is {@link java.nio.CharBuffer CharBuffer}. A decoder instance should be used in following sequence, which is referred to as a decoding operation:
1. Invoking the {@link #reset() reset} method to reset the decoder if thedecoder has been used;
2. Invoking the {@link #decode(ByteBuffer,CharBuffer,boolean) decode}method until the addtional input is not needed, the endOfInput parameter must be set to false, the input buffer must be filled and the output buffer must be flushed between invocations;
3. Invoking the {@link #decode(ByteBuffer,CharBuffer,boolean) decode}method last time, and the the endOfInput parameter must be set to true
4. Invoking the {@link #flush(CharBuffer) flush} method to flush theoutput.
The {@link #decode(ByteBuffer,CharBuffer,boolean) decode} method willconvert as many bytes as possible, and the process won't stop except the input bytes has been run out of, the output buffer has been filled or some error has happened. A {@link CoderResult CoderResult} instance will bereturned to indicate the stop reason, and the invoker can identify the result and choose further action, which can include filling the input buffer, flushing the output buffer, recovering from error and trying again.

There are two common decoding errors. One is named as malformed and it is returned when the input byte sequence is illegal for current specific charset, the other is named as unmappable character and it is returned when a problem occurs mapping a legal input byte sequence to its Unicode character equivalent.

The two errors can be handled in three ways, the default one is to report the error to the invoker by a {@link CoderResult CoderResult} instance, and thealternatives are to ignore it or to replace the erroneous input with the replacement string. The replacement string is "\uFFFD" by default and can be changed by invoking {@link #replaceWith(String) replaceWith} method. Theinvoker of this decoder can choose one way by specifing a {@link CodingErrorAction CodingErrorAction} instance for each error type via{@link #onMalformedInput(CodingErrorAction) onMalformedInput} method and{@link #onUnmappableCharacter(CodingErrorAction) onUnmappableCharacter}method.

This class is abstract class and encapsulate many common operations of decoding process for all charsets. Decoder for specific charset should extend this class and need only implement {@link #decodeLoop(ByteBuffer,CharBuffer) decodeLoop} method for basicdecoding loop. If a subclass maintains internal state, it should override the {@link #implFlush(CharBuffer) implFlush} method and{@link #implReset() implReset} method in addition.

This class is not thread-safe.
@see java.nio.charset.Charset @see java.nio.charset.CharsetEncoder

  
  /** Returns human-readable form of the term text. If the term is not unicode,
   * the raw bytes will be printed instead. */
  public static final String toString(BytesRef termText) {
    // the term might not be text, but usually is. so we make a best effort
    CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
        .onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT);
    try {
      return decoder.decode(ByteBuffer.wrap(termText.bytes, termText.offset, termText.length)).toString();
    } catch (CharacterCodingException e) {
      return termText.toString();
    }
  }

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   * @param stream the stream to wrap in a reader
   * @param charSet the expected charset
   * @return a wrapping reader
   */
  public static Reader getDecodingReader(InputStream stream, Charset charSet) {
    final CharsetDecoder charSetDecoder = charSet.newDecoder()
        .onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT);
    return new BufferedReader(new InputStreamReader(stream, charSetDecoder));
  }

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      do {
        b = is.read();
      } while (b >= 0 && b != 13 && b != 10);
    }
    
    CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
        .onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT);
    reader = new BufferedReader(new InputStreamReader(is, decoder), BUFFER_SIZE);
    
    if (seekTo > 0L) {

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   */
  public HunspellDictionary(InputStream affix, List<InputStream> dictionaries, Version version, boolean ignoreCase, boolean strictAffixParsing) throws IOException, ParseException {
    this.version = version;
    this.ignoreCase = ignoreCase;
    String encoding = getDictionaryEncoding(affix);
    CharsetDecoder decoder = getJavaEncoding(encoding);
    readAffixFile(affix, decoder, strictAffixParsing);
    words = new CharArrayMap<List<HunspellWord>>(version, 65535 /* guess */, this.ignoreCase);
    for (InputStream dictionary : dictionaries) {
      readDictionaryFile(dictionary, decoder);
    }

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      for (String file : files) {
        InputStream stream = null;
        Reader reader = null;
        try {
          stream = loader.openResource(file.trim());
          CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
              .onMalformedInput(CodingErrorAction.REPORT)
              .onUnmappableCharacter(CodingErrorAction.REPORT);
          reader = new InputStreamReader(stream, decoder);
          WordlistLoader.getSnowballWordSet(reader, words);
        } finally {

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      random.nextBytes(buffer);
      int size = 1 + random.nextInt(buffer.length);


      // This test is turning random bytes into a string,
      // this is asking for trouble.
      CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
          .onUnmappableCharacter(CodingErrorAction.REPLACE)
          .onMalformedInput(CodingErrorAction.REPLACE);
      uniqueValues[i] = decoder.decode(ByteBuffer.wrap(buffer, 0, size)).toString();
      // we cannot have empty path components, so eliminate all prefix as well
      // as middle consecuive delimiter chars.
      uniqueValues[i] = uniqueValues[i].replaceAll("/+", "/");
      if (uniqueValues[i].startsWith("/")) {
        uniqueValues[i] = uniqueValues[i].substring(1);

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    for (int i = 0; i < n; i++) {
      random().nextBytes(buffer);
      int size = 1 + random().nextInt(50);
      // This test is turning random bytes into a string,
      // this is asking for trouble.
      CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
          .onUnmappableCharacter(CodingErrorAction.REPLACE)
          .onMalformedInput(CodingErrorAction.REPLACE);
      String s = decoder.decode(ByteBuffer.wrap(buffer, 0, size)).toString();
      array.append(s);
      builder.append(s);
    }


    for (int i = 0; i < n; i++) {
      random().nextBytes(buffer);
      int size = 1 + random().nextInt(50);
      // This test is turning random bytes into a string,
      // this is asking for trouble.
      CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
          .onUnmappableCharacter(CodingErrorAction.REPLACE)
          .onMalformedInput(CodingErrorAction.REPLACE);
      String s = decoder.decode(ByteBuffer.wrap(buffer, 0, size)).toString();
      array.append((CharSequence)s);
      builder.append(s);
    }


    for (int i = 0; i < n; i++) {
      random().nextBytes(buffer);
      int size = 1 + random().nextInt(50);
      // This test is turning random bytes into a string,
      // this is asking for trouble.
      CharsetDecoder decoder = IOUtils.CHARSET_UTF_8.newDecoder()
          .onUnmappableCharacter(CodingErrorAction.REPLACE)
          .onMalformedInput(CodingErrorAction.REPLACE);
      String s = decoder.decode(ByteBuffer.wrap(buffer, 0, size)).toString();
      for (int j = 0; j < s.length(); j++) {
        array.append(s.charAt(j));
      }
      builder.append(s);
    }

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    }


    @Override
    public ManagedHttpClientConnection create(final HttpRoute route, final ConnectionConfig config) {
        final ConnectionConfig cconfig = config != null ? config : ConnectionConfig.DEFAULT;
        CharsetDecoder chardecoder = null;
        CharsetEncoder charencoder = null;
        final Charset charset = cconfig.getCharset();
        final CodingErrorAction malformedInputAction = cconfig.getMalformedInputAction() != null ?
                cconfig.getMalformedInputAction() : CodingErrorAction.REPORT;
        final CodingErrorAction unmappableInputAction = cconfig.getUnmappableInputAction() != null ?
                cconfig.getUnmappableInputAction() : CodingErrorAction.REPORT;
        if (charset != null) {
            chardecoder = charset.newDecoder();
            chardecoder.onMalformedInput(malformedInputAction);
            chardecoder.onUnmappableCharacter(unmappableInputAction);
            charencoder = charset.newEncoder();
            charencoder.onMalformedInput(malformedInputAction);
            charencoder.onUnmappableCharacter(unmappableInputAction);
        }
        final String id = "http-outgoing-" + Long.toString(COUNTER.getAndIncrement());

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      @Override
      public Object answer()
          throws Throwable
      {
        Charset charset = Charset.forName("UTF-8");
        CharsetDecoder decoder = charset.newDecoder();
        responseStr.append(decoder.decode((ByteBuffer)EasyMock.getCurrentArguments()[0]));
        return responseStr.length();
      }
    });
    EasyMock.replay(chunkedWritableByteChannel);

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      @Override
      public Object answer()
          throws Throwable
      {
        Charset charset = Charset.forName("UTF-8");
        CharsetDecoder decoder = charset.newDecoder();
        responseStr.append(decoder.decode((ByteBuffer)EasyMock.getCurrentArguments()[0]));
        return responseStr.length();
      }
    });
    EasyMock.replay(chunkedWritableByteChannel);

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