Example usage for java.nio ByteBuffer flip

Introduction

In this page you can find the example usage for java.nio ByteBuffer flip.

Prototype

public final Buffer flip() 

Source Link

Document

Flips this buffer.

Usage

From source file:org.apache.hadoop.hdfs.StripedFileTestUtil.java

static void verifyStatefulRead(FileSystem fs, Path srcPath, int fileLength, byte[] expected, ByteBuffer buf)
        throws IOException {
    try (FSDataInputStream in = fs.open(srcPath)) {
        ByteBuffer result = ByteBuffer.allocate(fileLength);
        int readLen = 0;
        int ret;/*from   ww  w .  j  a v a  2  s.  c  o  m*/
        while ((ret = in.read(buf)) >= 0) {
            readLen += ret;
            buf.flip();
            result.put(buf);
            buf.clear();
        }
        assertEquals("The length of file should be the same to write size", fileLength, readLen);
        Assert.assertArrayEquals(expected, result.array());
    }
}

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From source file:hivemall.recommend.SlimUDTF.java

private static void writeBuffer(@Nonnull final ByteBuffer srcBuf, @Nonnull final NioStatefulSegment dst)
        throws HiveException {
    srcBuf.flip();
    try {//from  w  w w.j a  va2 s .c o m
        dst.write(srcBuf);
    } catch (IOException e) {
        throw new HiveException("Exception causes while writing a buffer to file", e);
    }
    srcBuf.clear();
}

---

From source file:org.alfresco.repo.transfer.HttpClientTransmitterImpl.java

private static void channelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(2 * 1024);
    while (src.read(buffer) != -1) {
        // prepare the buffer to be drained
        buffer.flip();
        // write to the channel, may block
        dest.write(buffer);//  w  w  w .j  a  v a  2  s. c  o  m

        // If partial transfer, shift remainder down
        // If buffer is empty, same as doing clear()
        buffer.compact();
    }

    // EOF will leave buffer in fill state
    buffer.flip();

    // make sure the buffer is fully drained.
    while (buffer.hasRemaining()) {
        dest.write(buffer);
    }
}

---

From source file:com.sunchenbin.store.feilong.core.io.IOReaderUtil.java

/**
 * ?.// w  ww .j  av a 2 s.com
 *
 * @param file
 *            
 * @param charsetName
 *            ?,isNullOrEmpty, {@link CharsetType#UTF8}
 * @return the file content
 * @see org.apache.commons.io.FileUtils#readFileToString(File, Charset)
 */
public static String getFileContent(File file, String charsetName) {
    if (Validator.isNullOrEmpty(file)) {
        throw new NullPointerException("the file is null or empty!");
    }
    // ?
    final int capacity = 186140;
    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(capacity);
    StringBuilder sb = new StringBuilder(capacity);

    FileInputStream fileInputStream = null;
    try {
        fileInputStream = new FileInputStream(file);

        // ?????.
        FileChannel fileChannel = fileInputStream.getChannel();
        String useCharsetName = Validator.isNullOrEmpty(charsetName) ? DEFAULT_CHARSET_NAME : charsetName;
        Charset charset = Charset.forName(useCharsetName);
        while (fileChannel.read(byteBuffer) != -1) {
            // ??
            byteBuffer.flip();
            CharBuffer charBuffer = charset.decode(byteBuffer);
            sb.append(charBuffer.toString());
            byteBuffer.clear();
        }
        return sb.toString();

    } catch (FileNotFoundException e) {
        throw new UncheckedIOException(e);
    } catch (IOException e) {
        throw new UncheckedIOException(e);
    } finally {
        // ? ,^_^
        IOUtils.closeQuietly(fileInputStream);
    }
}

---

From source file:org.apache.kylin.engine.mr.common.CuboidStatsUtil.java

public static void writeCuboidStatistics(Configuration conf, Path outputPath, //
        Map<Long, HyperLogLogPlusCounter> cuboidHLLMap, int samplingPercentage, double mapperOverlapRatio)
        throws IOException {
    Path seqFilePath = new Path(outputPath, BatchConstants.CFG_STATISTICS_CUBOID_ESTIMATION_FILENAME);

    List<Long> allCuboids = new ArrayList<Long>();
    allCuboids.addAll(cuboidHLLMap.keySet());
    Collections.sort(allCuboids);

    ByteBuffer valueBuf = ByteBuffer.allocate(BufferedMeasureEncoder.DEFAULT_BUFFER_SIZE);
    SequenceFile.Writer writer = SequenceFile.createWriter(conf, SequenceFile.Writer.file(seqFilePath),
            SequenceFile.Writer.keyClass(LongWritable.class),
            SequenceFile.Writer.valueClass(BytesWritable.class));
    try {/*from  www  . ja  v  a 2 s. c om*/
        // mapper overlap ratio at key -1
        writer.append(new LongWritable(-1), new BytesWritable(Bytes.toBytes(mapperOverlapRatio)));

        // sampling percentage at key 0
        writer.append(new LongWritable(0L), new BytesWritable(Bytes.toBytes(samplingPercentage)));

        for (long i : allCuboids) {
            valueBuf.clear();
            cuboidHLLMap.get(i).writeRegisters(valueBuf);
            valueBuf.flip();
            writer.append(new LongWritable(i), new BytesWritable(valueBuf.array(), valueBuf.limit()));
        }
    } finally {
        IOUtils.closeQuietly(writer);
    }
}

---

From source file:net.pms.util.AudioUtils.java

/**
 * Parses the old RealAudio 1.0 and 2.0 formats that's not supported by
 * neither {@link org.jaudiotagger} nor MediaInfo. Returns {@code false} if
 * {@code channel} isn't one of these formats or the parsing fails.
 * <p>/*w w w.  j a v  a  2s. com*/
 * Primary references:
 * <ul>
 * <li><a href="https://wiki.multimedia.cx/index.php/RealMedia">RealAudio on
 * MultimediaWiki</a></li>
 * <li><a
 * href="https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/rmdec.c"
 * >FFmpeg rmdec.c</a></li>
 * </ul>
 *
 * @param channel the {@link Channel} containing the input. Size will only
 *            be parsed if {@code channel} is a {@link FileChannel}
 *            instance.
 * @param media the {@link DLNAMediaInfo} instance to write the parsing
 *            results to.
 * @return {@code true} if the {@code channel} input is in RealAudio 1.0 or
 *         2.0 format and the parsing succeeds; false otherwise
 */
public static boolean parseRealAudio(ReadableByteChannel channel, DLNAMediaInfo media) {
    final byte[] magicBytes = { 0x2E, 0x72, 0x61, (byte) 0xFD };
    ByteBuffer buffer = ByteBuffer.allocate(8);
    buffer.order(ByteOrder.BIG_ENDIAN);
    DLNAMediaAudio audio = new DLNAMediaAudio();
    try {
        int count = channel.read(buffer);
        if (count < 4) {
            LOGGER.trace("Input is too short to be RealAudio");
            return false;
        }
        buffer.flip();
        byte[] signature = new byte[4];
        buffer.get(signature);
        if (!Arrays.equals(magicBytes, signature)) {
            if (LOGGER.isTraceEnabled()) {
                LOGGER.trace("Input signature ({}) mismatches RealAudio version 1.0 or 2.0",
                        new String(signature, StandardCharsets.US_ASCII));
            }
            return false;
        }
        media.setContainer(FormatConfiguration.RA);
        short version = buffer.getShort();
        int reportedHeaderSize = 0;
        int reportedDataSize = 0;
        if (version == 3) {
            audio.setCodecA(FormatConfiguration.REALAUDIO_14_4);
            audio.getAudioProperties().setNumberOfChannels(1);
            audio.getAudioProperties().setSampleFrequency(8000);
            short headerSize = buffer.getShort();

            buffer = ByteBuffer.allocate(headerSize);
            channel.read(buffer);
            buffer.flip();
            buffer.position(8);
            int bytesPerMinute = buffer.getShort() & 0xFFFF;
            reportedDataSize = buffer.getInt();
            byte b = buffer.get();
            if (b != 0) {
                byte[] title = new byte[b & 0xFF];
                buffer.get(title);
                String titleString = new String(title, StandardCharsets.US_ASCII);
                audio.setSongname(titleString);
                audio.setAudioTrackTitleFromMetadata(titleString);
            }
            b = buffer.get();
            if (b != 0) {
                byte[] artist = new byte[b & 0xFF];
                buffer.get(artist);
                audio.setArtist(new String(artist, StandardCharsets.US_ASCII));
            }
            audio.setBitRate(bytesPerMinute * 8 / 60);
            media.setBitrate(bytesPerMinute * 8 / 60);
        } else if (version == 4 || version == 5) {
            buffer = ByteBuffer.allocate(14);
            channel.read(buffer);
            buffer.flip();
            buffer.get(signature);
            if (!".ra4".equals(new String(signature, StandardCharsets.US_ASCII))) {
                LOGGER.debug("Invalid RealAudio 2.0 signature \"{}\"",
                        new String(signature, StandardCharsets.US_ASCII));
                return false;
            }
            reportedDataSize = buffer.getInt();
            buffer.getShort(); //skip version repeated
            reportedHeaderSize = buffer.getInt();

            buffer = ByteBuffer.allocate(reportedHeaderSize);
            channel.read(buffer);
            buffer.flip();
            buffer.getShort(); // skip codec flavor
            buffer.getInt(); // skip coded frame size
            buffer.getInt(); // skip unknown
            long bytesPerMinute = buffer.getInt() & 0xFFFFFFFFL;
            buffer.getInt(); // skip unknown
            buffer.getShort(); // skip sub packet
            buffer.getShort(); // skip frame size
            buffer.getShort(); // skip sub packet size
            buffer.getShort(); // skip unknown
            if (version == 5) {
                buffer.position(buffer.position() + 6); // skip unknown
            }
            short sampleRate = buffer.getShort();
            buffer.getShort(); // skip unknown
            short sampleSize = buffer.getShort();
            short nrChannels = buffer.getShort();
            byte[] fourCC;
            if (version == 4) {
                buffer.position(buffer.get() + buffer.position()); // skip interleaver id
                fourCC = new byte[buffer.get()];
                buffer.get(fourCC);
            } else {
                buffer.getFloat(); // skip deinterlace id
                fourCC = new byte[4];
                buffer.get(fourCC);
            }
            String fourCCString = new String(fourCC, StandardCharsets.US_ASCII).toLowerCase(Locale.ROOT);
            switch (fourCCString) {
            case "lpcJ":
                audio.setCodecA(FormatConfiguration.REALAUDIO_14_4);
                break;
            case "28_8":
                audio.setCodecA(FormatConfiguration.REALAUDIO_28_8);
                break;
            case "dnet":
                audio.setCodecA(FormatConfiguration.AC3);
                break;
            case "sipr":
                audio.setCodecA(FormatConfiguration.SIPRO);
                break;
            case "cook":
                audio.setCodecA(FormatConfiguration.COOK);
            case "atrc":
                audio.setCodecA(FormatConfiguration.ATRAC);
            case "ralf":
                audio.setCodecA(FormatConfiguration.RALF);
            case "raac":
                audio.setCodecA(FormatConfiguration.AAC_LC);
            case "racp":
                audio.setCodecA(FormatConfiguration.HE_AAC);
            default:
                LOGGER.debug("Unknown RealMedia codec FourCC \"{}\" - parsing failed", fourCCString);
                return false;
            }

            if (buffer.hasRemaining()) {
                parseRealAudioMetaData(buffer, audio, version);
            }

            audio.setBitRate((int) (bytesPerMinute * 8 / 60));
            media.setBitrate((int) (bytesPerMinute * 8 / 60));
            audio.setBitsperSample(sampleSize);
            audio.getAudioProperties().setNumberOfChannels(nrChannels);
            audio.getAudioProperties().setSampleFrequency(sampleRate);
        } else {
            LOGGER.error("Could not parse RealAudio format - unknown format version {}", version);
            return false;
        }

        media.getAudioTracksList().add(audio);
        long fileSize = 0;
        if (channel instanceof FileChannel) {
            fileSize = ((FileChannel) channel).size();
            media.setSize(fileSize);
        }
        // Duration is estimated based on bitrate and might not be accurate
        if (audio.getBitRate() > 0) {
            int dataSize;
            if (fileSize > 0 && reportedHeaderSize > 0) {
                int fullHeaderSize = reportedHeaderSize + (version == 3 ? 8 : 16);
                if (reportedDataSize > 0) {
                    dataSize = (int) Math.min(reportedDataSize, fileSize - fullHeaderSize);
                } else {
                    dataSize = (int) (fileSize - fullHeaderSize);
                }
            } else {
                dataSize = reportedDataSize;
            }
            media.setDuration((double) dataSize / audio.getBitRate() * 8);
        }

    } catch (IOException e) {
        LOGGER.debug("Error while trying to parse RealAudio version 1 or 2: {}", e.getMessage());
        LOGGER.trace("", e);
        return false;
    }
    if (PMS.getConfiguration() != null
            && !PMS.getConfiguration().getAudioThumbnailMethod().equals(CoverSupplier.NONE)
            && (StringUtils.isNotBlank(media.getFirstAudioTrack().getSongname())
                    || StringUtils.isNotBlank(media.getFirstAudioTrack().getArtist()))) {
        ID3v1Tag tag = new ID3v1Tag();
        if (StringUtils.isNotBlank(media.getFirstAudioTrack().getSongname())) {
            tag.setTitle(media.getFirstAudioTrack().getSongname());
        }
        if (StringUtils.isNotBlank(media.getFirstAudioTrack().getArtist())) {
            tag.setArtist(media.getFirstAudioTrack().getArtist());
        }
        try {
            media.setThumb(DLNAThumbnail.toThumbnail(CoverUtil.get().getThumbnail(tag), 640, 480, ScaleType.MAX,
                    ImageFormat.SOURCE, false));
        } catch (IOException e) {
            LOGGER.error("An error occurred while generating thumbnail for RealAudio source: [\"{}\", \"{}\"]",
                    tag.getFirstTitle(), tag.getFirstArtist());
        }
    }
    media.setThumbready(true);
    media.setMediaparsed(true);

    return true;
}

---

From source file:org.apache.usergrid.persistence.map.impl.MapSerializationImpl.java

public static ByteBuffer serializeKeys(UUID ownerUUID, String ownerType, String mapName, String mapKey,
        int bucketNumber) {

    List<Object> keys = new ArrayList<>(4);
    keys.add(0, ownerUUID);/*  w ww .  j  a  v  a 2  s .c o  m*/
    keys.add(1, ownerType);
    keys.add(2, mapName);
    keys.add(3, mapKey);

    if (bucketNumber > 0) {
        keys.add(4, bucketNumber);
    }

    // UUIDs are 16 bytes, allocate the buffer accordingly
    int size = 16 + ownerType.getBytes().length + mapName.getBytes().length + mapKey.getBytes().length;
    if (bucketNumber > 0) {
        // ints are 4 bytes
        size += 4;
    }

    // we always need to add length for the 2 byte short and 1 byte equality
    size += keys.size() * 3;

    ByteBuffer stuff = ByteBuffer.allocate(size);

    for (Object key : keys) {

        ByteBuffer kb = DataType.serializeValue(key, ProtocolVersion.NEWEST_SUPPORTED);
        if (kb == null) {
            kb = ByteBuffer.allocate(0);
        }

        stuff.putShort((short) kb.remaining());
        stuff.put(kb.slice());
        stuff.put((byte) 0);

    }
    stuff.flip();
    return stuff.duplicate();

}

---

From source file:Main.java

/**
 * Decode/unescape a portion of a URL, to use with the query part ensure {@code plusAsBlank} is true.
 *
 * @param content     the portion to decode
 * @param charset     the charset to use
 * @param plusAsBlank if {@code true}, then convert '+' to space (e.g. for www-url-form-encoded content), otherwise leave as is.
 * @return encoded string/*  www. jav  a2s.c  o m*/
 */
private static String urldecode(final String content, final Charset charset, final boolean plusAsBlank) {
    if (content == null) {
        return null;
    }
    ByteBuffer bb = ByteBuffer.allocate(content.length());
    CharBuffer cb = CharBuffer.wrap(content);
    while (cb.hasRemaining()) {
        char c = cb.get();
        if (c == '%' && cb.remaining() >= 2) {
            char uc = cb.get();
            char lc = cb.get();
            int u = Character.digit(uc, 16);
            int l = Character.digit(lc, 16);
            if (u != -1 && l != -1) {
                bb.put((byte) ((u << 4) + l));
            } else {
                bb.put((byte) '%');
                bb.put((byte) uc);
                bb.put((byte) lc);
            }
        } else if (plusAsBlank && c == '+') {
            bb.put((byte) ' ');
        } else {
            bb.put((byte) c);
        }
    }
    bb.flip();
    return charset.decode(bb).toString();
}

---

From source file:com.glaf.core.util.ByteBufferUtils.java

/**
 * @return a new copy of the data in @param buffer USUALLY YOU SHOULD USE
 *         ByteBuffer.duplicate() INSTEAD, which creates a new Buffer (so
 *         you can mutate its position without affecting the original)
 *         without copying the underlying array.
 *//*from   w  w w.  j a  v a2  s  . c o m*/
public static ByteBuffer clone(ByteBuffer buffer) {
    assert buffer != null;

    if (buffer.remaining() == 0)
        return EMPTY_BYTE_BUFFER;

    ByteBuffer clone = ByteBuffer.allocate(buffer.remaining());

    if (buffer.hasArray()) {
        System.arraycopy(buffer.array(), buffer.arrayOffset() + buffer.position(), clone.array(), 0,
                buffer.remaining());
    } else {
        clone.put(buffer.duplicate());
        clone.flip();
    }

    return clone;
}

---

From source file:org.apache.hadoop.fs.TestEnhancedByteBufferAccess.java

private static byte[] byteBufferToArray(ByteBuffer buf) {
    byte resultArray[] = new byte[buf.remaining()];
    buf.get(resultArray);/*from ww w.j  ava 2  s.  c o  m*/
    buf.flip();
    return resultArray;
}

---

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