Example usage for java.nio ByteBuffer clear

Introduction

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

Prototype

public final Buffer clear()

Source Link

Document

Clears this buffer.

Usage

From source file:Main.java

private static byte[] getByteArrayFromBuffer(ByteBuffer byteBuf) {
    byteBuf.flip();//from w ww . ja va2  s.  c  om
    byte[] row = new byte[byteBuf.limit()];
    byteBuf.get(row);
    byteBuf.clear();
    return row;
}

From source file:Main.java

static ByteBuffer createMsg(int state, long leader, long zxid, long epoch) {
    byte requestBytes[] = new byte[28];
    ByteBuffer requestBuffer = ByteBuffer.wrap(requestBytes);

    /*// w w  w.j  ava2  s .  co  m
     * Building notification packet to send
     */

    requestBuffer.clear();
    requestBuffer.putInt(state);
    requestBuffer.putLong(leader);
    requestBuffer.putLong(zxid);
    requestBuffer.putLong(epoch);

    return requestBuffer;
}

From source file:pro.foundev.GzipCompressionOfColumnExample.java

private static String fromByteBuffer(ByteBuffer byteBuffer) {
    if (byteBuffer == null) {
        return null;
    }/* w w  w  .ja va2  s. c o m*/
    GZIPInputStream gzipInputStream = null;
    ByteArrayOutputStream baos = null;
    ByteBuffer dup = ByteBuffer.allocate(byteBuffer.limit());
    dup.clear();
    dup.put(byteBuffer);
    dup.flip();

    try {
        gzipInputStream = new GZIPInputStream(new ByteArrayInputStream(dup.array(), 0, dup.limit()));

        baos = new ByteArrayOutputStream();
        for (int value = 0; value != -1;) {
            value = gzipInputStream.read();
            if (value != -1) {
                baos.write(value);
            }
        }
        gzipInputStream.close();
        baos.flush();
        baos.close();
        return new String(baos.toByteArray(), charset);
    } catch (IOException e) {
        throw new RuntimeException("Error decompressing column data", e);
    } finally {
        if (gzipInputStream != null) {
            try {
                gzipInputStream.close();
            } catch (IOException e) {
            }
        }
        if (baos != null) {
            try {
                baos.flush();
                baos.close();
            } catch (IOException e) {
            }
        }
    }
}

From source file:Main.java

public static ByteBuffer setupByteBuffer(ByteBuffer preBuffer, byte[] array) {

    if (preBuffer == null || preBuffer.capacity() < array.length) {
        preBuffer = createByteBuffer(array.length * 2);
    } else {/* w  ww .  ja  v a2  s  . co m*/
        preBuffer.clear();
    }
    preBuffer.put(array);
    preBuffer.position(0);
    return preBuffer;
}

From source file:com.arrow.acn.client.utils.MD5Util.java

public static byte[] calcMD5Checksum(Path path) throws NoSuchAlgorithmException, IOException {
    MessageDigest md = MessageDigest.getInstance("MD5");
    try (SeekableByteChannel sbc = Files.newByteChannel(path)) {
        ByteBuffer buf = ByteBuffer.allocateDirect(BUFFER_SIZE);
        while (sbc.read(buf) > 0) {
            buf.flip();// w w  w  .j a  va2s . c o m
            md.update(buf);
            buf.clear();
        }
    }
    return md.digest();
}

From source file:Main.java

public static void transfer(ReadableByteChannel in, WritableByteChannel out) throws IOException {
    ByteBuffer buffer = ByteBuffer.allocate(4096);
    while (in.read(buffer) != -1) {
        buffer.flip();/*  w  w  w.  ja  v a  2  s  .  c  o  m*/
        while (buffer.hasRemaining()) {
            out.write(buffer);
        }
        buffer.clear();
    }
}

From source file:xbird.server.services.RemotePagingService.java

private static boolean doRead(final SocketChannel channel, final ByteBuffer cmdBuffer) throws IOException {
    cmdBuffer.clear();
    int n, count = 0;
    while (channel.isOpen() && (n = channel.read(cmdBuffer)) > 0) {
        count += n;/*from   www .  j a  v  a 2  s .c  o m*/
    }
    return count > 0;
}

From source file:Main.java

public static Object getObject(ByteBuffer byteBuffer) throws ClassNotFoundException, IOException {
    InputStream input = new ByteArrayInputStream(byteBuffer.array());
    ObjectInputStream oi = new ObjectInputStream(input);
    Object obj = oi.readObject();
    input.close();//from w ww .j a  v  a  2 s  .  c  o  m
    oi.close();
    byteBuffer.clear();
    return obj;
}

From source file:IOUtilities.java

/**
 * Copy ALL available data from one stream into another
 * @param in/*from w  ww .  jav a2 s . com*/
 * @param out
 * @throws IOException
 */
public static void copy(InputStream in, OutputStream out) throws IOException {
    ReadableByteChannel source = Channels.newChannel(in);
    WritableByteChannel target = Channels.newChannel(out);

    ByteBuffer buffer = ByteBuffer.allocate(16 * 1024);
    while (source.read(buffer) != -1) {
        buffer.flip(); // Prepare the buffer to be drained
        while (buffer.hasRemaining()) {
            target.write(buffer);
        }
        buffer.clear(); // Empty buffer to get ready for filling
    }

    source.close();
    target.close();

}

From source file:com.google.cloud.public_datasets.nexrad2.GcsUntar.java

private static File downloadFromGcs(String bucketName, String blobName, File tmpDir) throws IOException {
    Storage storage = StorageOptions.getDefaultInstance().getService();
    File fileName = File.createTempFile("download", "bytes", tmpDir);
    try (ReadChannel reader = storage.reader(bucketName, blobName);
            FileOutputStream writer = new FileOutputStream(fileName)) {
        ByteBuffer bytes = ByteBuffer.allocate(64 * 1024);
        while (reader.read(bytes) > 0) {
            bytes.flip();/*from   www.  j  a v  a2 s .c  o  m*/
            writer.getChannel().write(bytes);
            bytes.clear();
        }
    }
    return fileName;
}