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

    }
    
    private static IRubyObject convert(ThreadContext context, String decodeCharset, 
            String encodeCharset, IRubyObject str) {
        Ruby runtime = context.getRuntime();
        CharsetDecoder decoder;
        CharsetEncoder encoder;
        try {
            decoder = Charset.forName(decodeCharset).newDecoder();
            encoder = Charset.forName(encodeCharset).newEncoder();
        } catch (UnsupportedCharsetException e) {
            throw runtime.newArgumentError("invalid encoding");
        }
        
        ByteList bytes = str.convertToString().getByteList();
        ByteBuffer buf = ByteBuffer.wrap(bytes.unsafeBytes(), bytes.begin(), bytes.length());
        try {
            CharBuffer cbuf = decoder.decode(buf);
            buf = encoder.encode(cbuf);
        } catch (CharacterCodingException e) {
            throw runtime.newArgumentError("invalid encoding");
        }
        byte[] arr = buf.array();

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            new DataFileStream<GenericRecord>(input, reader);
        GenericRecord record = new GenericData.Record(avroStream.getSchema());
        while (avroStream.hasNext()) {
          avroStream.next(record);
          ByteBuffer body = (ByteBuffer) record.get("body");
          CharsetDecoder decoder = Charsets.UTF_8.newDecoder();
          String bodyStr = decoder.decode(body).toString();
          LOG.debug("Removing event: {}", bodyStr);
          bodies.remove(bodyStr);
          found++;
        }
        avroStream.close();

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        Assert.assertNotSame(nioBuf, ByteBuffer.allocate(16).buf());
    }


    public void testGetString() throws Exception {
        ByteBuffer buf = ByteBuffer.allocate(16);
        CharsetDecoder decoder;


        Charset charset = Charset.forName("UTF-8");
        buf.clear();
        buf.putString("hello", charset.newEncoder());
        buf.put((byte) 0);

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    }


    public void testGetPrefixedString() throws Exception {
        ByteBuffer buf = ByteBuffer.allocate(16);
        CharsetEncoder encoder;
        CharsetDecoder decoder;
        encoder = Charset.forName("ISO-8859-1").newEncoder();
        decoder = Charset.forName("ISO-8859-1").newDecoder();


        buf.putShort((short) 3);
        buf.putString("ABCD", encoder);

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                    if (ctx.getOverflowLength() == 0) {
                        ByteBuffer buf = ctx.getBuffer();
                        buf.flip();
                        buf.limit(buf.limit() - matchCount);


                        CharsetDecoder decoder = ctx.getDecoder();
                        CharBuffer buffer = decoder.decode(buf);
                        decoded = new String(buffer.array());
                    } else {
                        int overflowPosition = ctx.getOverflowLength();
                        throw new IllegalStateException("Line is too long: " + overflowPosition);
                    }

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                        if (ctx.getOverflowLength() == 0) {
                            ByteBuffer buf = ctx.getBuffer();
                            buf.flip();
                            buf.limit(buf.limit() - matchCount);


                            CharsetDecoder decoder = ctx.getDecoder();
                            CharBuffer buffer = decoder.decode(buf);
                            decoded = new String(buffer.array());
                        } else {
                            int overflowLength = ctx.getOverflowLength();
                            throw new IllegalStateException("Line is too long: " + overflowLength);
                        }

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    XMLReader xmlReader = XMLReaderFactory.createXMLReader();
    DependencyRevChecker revChecker = new DependencyRevChecker(ivyXmlFile); 
    xmlReader.setContentHandler(revChecker);
    xmlReader.setErrorHandler(revChecker);
    // To work around a bug in XERCES (XERCESJ-1257), we assume the XML is always UTF8, so we simply provide reader.
    CharsetDecoder decoder = Charset.forName("UTF-8").newDecoder()
        .onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT);
    InputStream stream = new FileInputStream(ivyXmlFile);
    xmlReader.parse(new InputSource(new BufferedReader(new InputStreamReader(stream, decoder))));
    return ! revChecker.fail;

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  }
  
  public static ConnectionCostsWriter build(String filename) throws IOException {
    FileInputStream inputStream = new FileInputStream(filename);
    Charset cs = Charset.forName("US-ASCII");
    CharsetDecoder decoder = cs.newDecoder()
        .onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT);
    InputStreamReader streamReader = new InputStreamReader(inputStream, decoder);
    LineNumberReader lineReader = new LineNumberReader(streamReader);

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      throws IOException {
    UnknownDictionaryWriter dictionary = new UnknownDictionaryWriter(5 * 1024 * 1024);
    
    FileInputStream inputStream = new FileInputStream(filename);
    Charset cs = Charset.forName(encoding);
    CharsetDecoder decoder = cs.newDecoder()
        .onMalformedInput(CodingErrorAction.REPORT)
        .onUnmappableCharacter(CodingErrorAction.REPORT);
    InputStreamReader streamReader = new InputStreamReader(inputStream, decoder);
    LineNumberReader lineReader = new LineNumberReader(streamReader);

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    System.out.println("  parse...");
    List<String[]> lines = new ArrayList<String[]>(400000);
    for (File file : csvFiles){
      FileInputStream inputStream = new FileInputStream(file);
      Charset cs = Charset.forName(encoding);
      CharsetDecoder decoder = cs.newDecoder()
          .onMalformedInput(CodingErrorAction.REPORT)
          .onUnmappableCharacter(CodingErrorAction.REPORT);
      InputStreamReader streamReader = new InputStreamReader(inputStream, decoder);
      BufferedReader reader = new BufferedReader(streamReader);

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