Examples of java.nio.CharBuffer

java.nio.CharBuffer
A buffer of chars.
A char buffer can be created in either of the following ways:
- {@link #allocate(int) Allocate} a new char array and create a bufferbased on it;
- {@link #wrap(char[]) Wrap} an existing char array to create a newbuffer;
- {@link #wrap(CharSequence) Wrap} an existing char sequence to create anew buffer;
- Use {@link java.nio.ByteBuffer#asCharBuffer() ByteBuffer.asCharBuffer}to create a char buffer based on a byte buffer.


                        // It's in the range, so process the file
                        RandomAccessFile raf = new RandomAccessFile(logFiles[i], "r");
                        FileChannel fc = raf.getChannel();
                        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
                        CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Tomcat use a different charset on a foreign PC?
                        Matcher lines = FULL_LINE_PATTERN.matcher(cb);
                        Matcher target = ACCESS_LOG_PATTERN.matcher("");
                        SimpleDateFormat format = (start == 0 && end == 0) ? null : new SimpleDateFormat(ACCESS_LOG_DATE_FORMAT);
                        int max = maxResults == null ? MAX_SEARCH_RESULTS : Math.min(maxResults.intValue(), MAX_SEARCH_RESULTS);


                        while(lines.find()) {
                            ++lineCount;
                            ++fileLineCount;
                            if(capped) {
                                continue;
                            }
                            CharSequence line = cb.subSequence(lines.start(), lines.end());
                            target.reset(line);
                            if(target.find()) {
                                if(host != null && !host.equals(target.group(GROUP_HOST))) {
                                    continue;
                                }

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    @Test
    public void testValidUtf8() throws UnsupportedEncodingException
    {
        assert Character.MAX_CODE_POINT == 0x0010ffff;
        CharBuffer cb = CharBuffer.allocate(2837314);
        // let's test all of the unicode space.
        for (int i = 0; i < Character.MAX_CODE_POINT; i++)
        {
            // skip U+D800..U+DFFF. those CPs are invalid in utf8. java tolerates them, but doesn't convert them to
            // valid byte sequences (gives us '?' instead), so there is no point testing them.
            if (i >= 55296 && i <= 57343)
                continue;
            char[] ch = Character.toChars(i);
            for (char c : ch)
                cb.append(c);
        }
        String s = new String(cb.array());
        byte[] arr = s.getBytes("UTF8");
        ByteBuffer buf = ByteBuffer.wrap(arr);
        UTF8Type.instance.validate(buf);
        
        // some you might not expect.

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  public ByteArrayCodepointIterator(byte[] bytes, String charset) {
    this(bytes,Charset.forName(charset));
  }
  
  public ByteArrayCodepointIterator(byte[] bytes, Charset charset) {
    CharBuffer cb = charset.decode(ByteBuffer.wrap(bytes));
    buffer = cb.array();
    position = cb.position();
    limit = cb.limit();
  }

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        int lineCount = 0;
        try {
            RandomAccessFile raf = new RandomAccessFile(file, "r");
            FileChannel fc = raf.getChannel();
            MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
            CharBuffer cb = Charset.forName("US-ASCII").decode(bb); //todo: does Jetty use a different charset on a foreign PC?
            Matcher lines = FULL_LINE_PATTERN.matcher(cb);
            Matcher target = ACCESS_LOG_PATTERN.matcher("");
            long start = startDate == null ? 0 : startDate.getTime();
            long end = endDate == null ? 0 : endDate.getTime();
            SimpleDateFormat format = (start == 0 && end == 0) ? null : new SimpleDateFormat(ACCESS_LOG_DATE_FORMAT);
            int max = maxResults == null ? MAX_SEARCH_RESULTS : Math.min(maxResults.intValue(), MAX_SEARCH_RESULTS);
log.warn("CRITERIA: "+file.getAbsolutePath()+" "+host+" "+user+" "+method+" "+uri+" "+start+" "+end+" "+skipResults+" "+max);
            while(lines.find()) {
                ++lineCount;
                if(capped) {
                    continue;
                }
                CharSequence line = cb.subSequence(lines.start(), lines.end());
                target.reset(line);
                if(target.find()) {
                    if(host != null && !host.equals(target.group(GROUP_HOST))) {
                        continue;
                    }

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                //the above 2 tests should catch almost all cases. But maybe there was a failure while creating f2
                //that isn't related to case sensitivity. Let's see if we can open the file we just created using
                //f2
                try {
                    CharBuffer buf = CharBuffer.allocate(32);
                    FileReader reader = new FileReader(f2);


                    while (reader.read(buf) != -1 && buf.length() < 4);
                    if (buf.length() == 4 && buf.toString().equals("test")) {
                        return false;
                    } else {
                        //we probably shouldn't get here. If the filesystem was case-sensetive, creating a new
                        //FileReader should have thrown a FileNotFoundException. Otherwise, we should have opened
                        //the file and read in the string "test". It's remotely possible that someone else modified

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         * The array that backs this instance is the whole block of decoded messages.
         *
         * @return CharBuffer instance
         */
        public CharBufferWrapper next() {
            final CharBuffer message;
            fromLineFound = fromLineMathcer.find();
            if (fromLineFound) {
                message = mboxCharBuffer.slice();
                message.position(findEnd + 1);
                saveFindPositions(fromLineMathcer);
                message.limit(fromLineMathcer.start());
            } else {
                /* We didn't find other From_ lines this means either:
                 *  - we reached end of mbox and no more messages
                 *  - we reached end of CharBuffer and need to decode another batch.
                 */
                if (byteBuffer.hasRemaining()) {
                    // decode another batch, but remember to copy the remaining chars first
                    CharBuffer oldData = mboxCharBuffer.duplicate();
                    mboxCharBuffer.clear();
                    oldData.position(findStart);
                    while (oldData.hasRemaining()) {
                        mboxCharBuffer.put(oldData.get());
                    }
                    try {
                        decodeNextCharBuffer();
                    } catch (CharConversionException ex) {
                        throw new RuntimeException(ex);

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    @SuppressWarnings("ObjectToString")
    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);
        }
        return dst.flip().toString();
    }

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            System.err.println("eek! unknown Contentlength for: " + script);
            length = 10240;
        }


        InputStream in = conn.getInputStream();
        CharBuffer cbuf = CharBuffer.allocate(length);
        Reader reader = new InputStreamReader(in);
        reader.read(cbuf);
        in.close();
        cbuf.rewind();


        return cbuf;
    }

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    return map;
  }


  public static Double parseDouble(String _valueString) {
    CharBuffer str = CharBuffer.wrap(_valueString);
    String first = ReadStreamExtensions.upTo_(str, 'd');
    String second = ReadStreamExtensions.upToEnd(str);
    if (second.length() == 0) return Double.valueOf(_valueString);
    return Double.valueOf(first+"e"+second+"d");
  }

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        return pos;
    }


    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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