Examples of java.nio.charset.CoderResult

java.nio.charset.CoderResult
Used to indicate the result of encoding/decoding. There are four types of results:
1. UNDERFLOW indicates all input has been processed, or more input is required. It is represented by the unique object CoderResult.UNDERFLOW.
2. OVERFLOW indicates insufficient output buffer. It is represented by the unique object CoderResult.OVERFLOW.
3. A malformed-input error indicates an unrecognizable sequence of input units has been encountered. Get an instance of this type of result by calling CoderResult.malformedForLength(int) with the length of the malformed-input.
4. An unmappable-charactor error indicates a sequence of input units can not be mapped to the output charset. Get an instance of this type of result by calling CoderResult.unmappableForLength(int) with the input sequence size indicating the identity of the unmappable character.

    boolean isEndOfInput = false;
    if (position >= fileSize) {
      isEndOfInput = true;
    }


    CoderResult res = decoder.decode(buf, charBuf, isEndOfInput);
    if (res.isMalformed() || res.isUnmappable()) {
      res.throwException();
    }


    int delta = buf.position() - start;


    charBuf.flip();

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    public static String decodeString(ByteBuffer src, Charset charset)
    {
        CharsetDecoder decoder = getDecoder(charset);
        CharBuffer dst = CharBuffer.allocate((int) ((double) src.remaining() * decoder.maxCharsPerByte()));
        try {
            CoderResult cr = decoder.decode(src, dst, true);
            if (!cr.isUnderflow()) {
                cr.throwException();
            }
            cr = decoder.flush(dst);
            if (!cr.isUnderflow()) {
                cr.throwException();
            }
        }
        catch (CharacterCodingException x) {
            throw new IllegalStateException(x);
        }

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    private static String decode(ByteBuffer bb, CharsetDecoder decoder)
    {
        CharBuffer cb = CharBuffer.allocate(128);


        CoderResult result = decoder.decode((ByteBuffer) bb.flip(), cb, true /* endOfInput */);
        if (result.isError())
        {
            throw new IllegalArgumentException("Malformed UTF-8!");
        }


        return ((CharBuffer) cb.flip()).toString();

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    ce.reset();
    ByteBuffer bb = ByteBuffer.wrap(ba);
    CharBuffer cb = CharBuffer.wrap(src, off, len);
    try {
      CoderResult cr = ce.encode(cb, bb, true);
      if (!cr.isUnderflow())
        cr.throwException();
      cr = ce.flush(bb);
      if (!cr.isUnderflow())
        cr.throwException();
      return bb;
    } catch (CharacterCodingException x) {
      // Substitution is always enabled,
      // so this shouldn't happen
      throw new Error(x);

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        public  int encode(String source) {
            wrapper.clear();
            encoder.reset();


            CharBuffer in = CharBuffer.wrap(source);
            CoderResult result = encoder.encode(in, wrapper, true);
            assert result == CoderResult.UNDERFLOW;
            result = encoder.flush(wrapper);
            assert result == CoderResult.UNDERFLOW;


            return wrapper.position();

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                tempWrapper.clear();
                tempWrapper.limit(readLength);
                readOffset += readLength;


                done = readOffset == source.length();
                CoderResult result = encoder.encode(tempWrapper, wrapper, done);
                assert result == CoderResult.UNDERFLOW;
            }
            CoderResult result = encoder.flush(wrapper);
            assert result == CoderResult.UNDERFLOW;


            return wrapper.position();
        }

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        CharBuffer cb = CharBuffer.wrap(name);
        ByteBuffer out = ByteBuffer.allocate(name.length()
                                             + (name.length() + 1) / 2);


        while (cb.remaining() > 0) {
            CoderResult res = enc.encode(cb, out,true);


            if (res.isUnmappable() || res.isMalformed()) {


                // write the unmappable characters in utf-16
                // pseudo-URL encoding style to ByteBuffer.
                if (res.length() * 6 > out.remaining()) {
                    out = ZipEncodingHelper.growBuffer(out, out.position()
                                                       + res.length() * 6);
                }


                for (int i=0; i<res.length(); ++i) {
                    ZipEncodingHelper.appendSurrogate(out,cb.get());
                }


            } else if (res.isOverflow()) {


                out = ZipEncodingHelper.growBuffer(out, 0);


            } else if (res.isUnderflow()) {


                enc.flush(out);
                break;


            }

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        Text text = target.get();
        encoder.reset();
        encodeBuffer.clear();
        while (true) {
            CoderResult result = encoder.encode(source, encodeBuffer, true);
            if (result.isError()) {
                throw new RecordFormatException(MessageFormat.format(
                        "Cannot process a character string (\"{0}\")",
                        result));
            }
            if (result.isUnderflow()) {
                consumeEncoded(text);
                break;
            }
            if (result.isOverflow()) {
                consumeEncoded(text);
            }
        }
        while (true) {
            CoderResult result = encoder.flush(encodeBuffer);
            if (result.isError()) {
                throw new RecordFormatException(MessageFormat.format(
                        "Cannot process a character string (\"{0}\")",
                        result));
            }
            if (result.isUnderflow()) {
                consumeEncoded(text);
                break;
            }
            if (result.isOverflow()) {
                consumeEncoded(text);
            }
        }
    }

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        byte[] bytes = text.getBytes();
        ByteBuffer source = ByteBuffer.wrap(bytes, 0, text.getLength());
        decoder.reset();
        decodeBuffer.clear();
        while (true) {
            CoderResult result = decoder.decode(source, decodeBuffer, true);
            if (result.isError()) {
                throw new RecordFormatException(MessageFormat.format(
                        "Cannot process a character string (\"{0}\")",
                        result));
            }
            if (result.isUnderflow()) {
                consumeDecoded();
                break;
            }
            if (result.isOverflow()) {
                consumeDecoded();
            }
        }
        while (true) {
            CoderResult result = decoder.flush(decodeBuffer);
            if (result.isError()) {
                throw new RecordFormatException(MessageFormat.format(
                        "Cannot process a character string (\"{0}\")",
                        result));
            }
            if (result.isUnderflow()) {
                consumeDecoded();
                break;
            }
            if (result.isOverflow()) {
                consumeDecoded();
            }
        }
    }

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            this.endpoint = endpoint;
        }


        public void write() {
            buffer.clear();
            CoderResult cr = encoder.encode(message, buffer, true);
            if (cr.isError()) {
                throw new IllegalArgumentException(cr.toString());
            }
            isDone = !cr.isOverflow();
            buffer.flip();
            endpoint.startMessage(Constants.OPCODE_TEXT, buffer,
                    isDone && isLast, this);
        }

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