Example usage for java.nio ByteBuffer position

Introduction

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

Prototype

public final int position() 

Source Link

Document

Returns the position of this buffer.

Usage

From source file:kilim.http.HttpRequest.java

public void dumpBuffer(ByteBuffer buffer) {
    byte[] ba = buffer.array();
    int len = buffer.position();
    StringBuilder print = new StringBuilder();
    for (int i = 0; i < len; i++) {
        print.append((char) ba[i]);
    }//from ww w  .ja  v  a2 s.  c  o  m
    log.debug(print);
}

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From source file:co.cask.cdap.client.rest.RestStreamWriter.java

@Override
public ListenableFuture<Void> write(ByteBuffer buffer, Map<String, String> headers)
        throws IllegalArgumentException {
    Preconditions.checkArgument(buffer != null, "ByteBuffer parameter is null.");
    HttpEntity content;// ww  w  . j av a2 s. c o  m
    if (buffer.hasArray()) {
        content = new ByteArrayEntity(buffer.array(), buffer.arrayOffset() + buffer.position(),
                buffer.remaining());
    } else {
        byte[] bytes = new byte[buffer.remaining()];
        buffer.get(bytes);
        content = new ByteArrayEntity(bytes);
    }
    return write(content, headers);
}

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From source file:com.yobidrive.diskmap.needles.Needle.java

public void putNeedleInBuffer(ByteBuffer result) throws Exception {
    int startPosition = result.position();
    result.limit(result.capacity());//from w ww.j  av a  2 s . co m
    result.putInt(MAGICSTART);
    result.putLong(needleNumber);
    result.put(flags);
    result.putInt(keyBytes.length);
    result.put(keyBytes);
    result.putInt(version == null ? 0 : version.toBytes().length);
    if (version != null)
        result.put(version.toBytes());
    result.putInt(previousNeedle == null ? -1 : previousNeedle.getNeedleFileNumber()); // Chaining
    result.putLong(previousNeedle == null ? -1L : previousNeedle.getNeedleOffset()); // Chaining
    result.putInt(originalFileNumber); // Original needle location (for cleaning)
    result.putInt(originalSize); // Original needle size (for cleaning)
    result.putInt(data == null ? 0 : data.length);
    if (data != null)
        result.put(data);
    result.putInt(MAGICEND);
    result.put(hashMD5());
    while (((result.position() - startPosition) % 256) > 0) {
        result.put(PADDING);
    }
    result.flip();
}

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From source file:com.facebook.hive.orc.ReaderImpl.java

public ReaderImpl(FileSystem fs, Path path, Configuration conf) throws IOException {
    try {/*from  w ww.ja  v  a 2s.  c  o  m*/
        this.fileSystem = fs;
        this.path = path;
        this.conf = conf;
        FSDataInputStream file = fs.open(path);
        long size = fs.getFileStatus(path).getLen();
        int readSize = (int) Math.min(size, DIRECTORY_SIZE_GUESS);
        ByteBuffer buffer = ByteBuffer.allocate(readSize);
        InStream.read(file, size - readSize, buffer.array(), buffer.arrayOffset() + buffer.position(),
                buffer.remaining());
        int psLen = buffer.get(readSize - 1);
        int psOffset = readSize - 1 - psLen;
        CodedInputStream in = CodedInputStream.newInstance(buffer.array(), buffer.arrayOffset() + psOffset,
                psLen);
        OrcProto.PostScript ps = OrcProto.PostScript.parseFrom(in);
        int footerSize = (int) ps.getFooterLength();
        bufferSize = (int) ps.getCompressionBlockSize();
        switch (ps.getCompression()) {
        case NONE:
            compressionKind = CompressionKind.NONE;
            break;
        case ZLIB:
            compressionKind = CompressionKind.ZLIB;
            break;
        case SNAPPY:
            compressionKind = CompressionKind.SNAPPY;
            break;
        case LZO:
            compressionKind = CompressionKind.LZO;
            break;
        default:
            throw new IllegalArgumentException("Unknown compression");
        }
        codec = WriterImpl.createCodec(compressionKind);

        InputStream instream = InStream.create("footer", file, size - 1 - psLen - footerSize, footerSize, codec,
                bufferSize);
        footer = OrcProto.Footer.parseFrom(instream);
        inspector = new OrcLazyRowObjectInspector(0, footer.getTypesList());
        file.close();
    } catch (IndexOutOfBoundsException e) {
        /**
         * When a non ORC file is read by ORC reader, we get IndexOutOfBoundsException exception while
         * creating a reader. Caught that exception and checked the file header to see if the input
         * file was ORC or not. If its not ORC, throw a NotAnORCFileException with the file
         * attempted to be reading (thus helping to figure out which table-partition was being read).
         */
        checkIfORC(fs, path);
        throw new IOException("Failed to create record reader for file " + path, e);
    } catch (IOException e) {
        throw new IOException("Failed to create record reader for file " + path, e);
    }
}

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From source file:edu.umn.cs.spatialHadoop.visualization.FrequencyMap.java

@Override
public void write(DataOutput out) throws IOException {
    super.write(out);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    GZIPOutputStream gzos = new GZIPOutputStream(baos);
    ByteBuffer bbuffer = ByteBuffer.allocate(getHeight() * 4 + 8);
    bbuffer.putInt(getWidth());/*from   w  w  w  .  j  av  a  2s .c o m*/
    bbuffer.putInt(getHeight());
    gzos.write(bbuffer.array(), 0, bbuffer.position());
    for (int x = 0; x < getWidth(); x++) {
        bbuffer.clear();
        for (int y = 0; y < getHeight(); y++) {
            bbuffer.putFloat(frequencies[x][y]);
        }
        gzos.write(bbuffer.array(), 0, bbuffer.position());
    }
    gzos.close();

    byte[] serializedData = baos.toByteArray();
    out.writeInt(serializedData.length);
    out.write(serializedData);
}

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From source file:com.mycustomloader.vsamloader.VSAMLoader.java

private void readField(ByteBuffer buf, int fieldID) {
    if (mRequiredColumns == null || (mRequiredColumns.length > fieldID && mRequiredColumns[fieldID])) {
        byte[] bytes = new byte[buf.position()];
        buf.rewind();//from   w w  w.j a  v a2s  .c o m
        buf.get(bytes, 0, bytes.length);
        mProtoTuple.add(new DataByteArray(bytes));
    }
    buf.clear();
}

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From source file:com.gamesalutes.utils.ByteUtils.java

/**
 * Extends the size of <code>buf</code> to at least meet <code>minCap</code>.
 * If <code>buf</code> is too small, then a new buffer is allocated and
 * any existing contents in <code>buf</code> will be transfered.  The position
 * of the new buffer will be that of the old buffer if it was not <code>null</code>, and
 * the previous mark will be discarded if one was set.
 * /* w  w w  .  j  a  v a  2  s.com*/
 * @param buf the input <code>ByteBuffer</code>
 * @param minCap the minimum capacity
 * @return a <code>ByteBuffer</code> that can meet <code>minCap</code>
 */
public static ByteBuffer growBuffer(ByteBuffer buf, int minCap) {
    int myLimit = buf != null ? buf.limit() : 0;
    // limit can accomidate capacity requirements
    if (buf != null && myLimit >= minCap)
        return buf;
    int myCap = buf != null ? buf.capacity() : 0;
    // capacity can accomidate but limit is too small
    if (buf != null && myCap >= minCap) {
        buf.limit(myCap);
        return buf;
    } else //if(myCap < minCap)
    {
        ByteBuffer newBuffer = null;
        if (myCap == 0)
            myCap = 1;
        while (myCap < minCap)
            myCap <<= 1;
        if (buf != null && buf.isDirect())
            newBuffer = ByteBuffer.allocateDirect(myCap);
        else
            newBuffer = ByteBuffer.allocate(myCap);
        // copy contents of original buffer
        if (buf != null) {
            int pos = buf.position();
            buf.clear();
            newBuffer.put(buf);
            newBuffer.position(pos);
        }
        return newBuffer;

    }
}

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From source file:org.eclipse.jgit.lfs.server.fs.LfsServerTest.java

private void checkResponseStatus(HttpResponse response) {
    StatusLine statusLine = response.getStatusLine();
    int status = statusLine.getStatusCode();
    if (statusLine.getStatusCode() >= 400) {
        String error;/* ww w .j  a  va2s  .com*/
        try {
            ByteBuffer buf = IO.readWholeStream(new BufferedInputStream(response.getEntity().getContent()),
                    1024);
            if (buf.hasArray()) {
                error = new String(buf.array(), buf.arrayOffset() + buf.position(), buf.remaining(), UTF_8);
            } else {
                final byte[] b = new byte[buf.remaining()];
                buf.duplicate().get(b);
                error = new String(b, UTF_8);
            }
        } catch (IOException e) {
            error = statusLine.getReasonPhrase();
        }
        throw new RuntimeException("Status: " + status + " " + error);
    }
    assertEquals(200, status);
}

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From source file:com.spectralogic.ds3client.helpers.channels.WindowedSeekableByteChannel_Test.java

@Test(timeout = 1000)
public void readPositionTracking() throws IOException {
    try (final SeekableByteChannel channel = stringToChannel("aabbbcccc")) {
        final Object lock = new Object();
        try (final WindowedSeekableByteChannel window = new WindowedSeekableByteChannel(channel, lock, 2L,
                7L)) {//from   www. j a v  a 2  s . c  om
            final byte[] bytes = new byte[10];
            final ByteBuffer buffer = ByteBuffer.wrap(bytes);

            buffer.limit(3);
            assertThat(window.read(buffer), is(3));
            assertThat(window.position(), is(3L));
            assertThat(buffer.position(), is(3));
            assertThat(buffer.limit(), is(3));
            assertThat(new String(bytes, 0, 3, Charset.forName("UTF-8")), is("bbb"));

            buffer.limit(10);
            assertThat(window.read(buffer), is(4));
            assertThat(window.position(), is(7L));
            assertThat(buffer.position(), is(7));
            assertThat(buffer.limit(), is(10));
            assertThat(new String(bytes, 3, 4, Charset.forName("UTF-8")), is("cccc"));
        }
    }
}

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