Example usage for java.nio ByteBuffer allocate

Introduction

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

Prototype

public static ByteBuffer allocate(int capacity)

Source Link

Document

Creates a byte buffer based on a newly allocated byte array.

Usage

From source file:MainClass.java

public void run() {
    try {//ww w . j a v a2s.  com
        ByteBuffer buffer = ByteBuffer.allocate(4);
        buffer.putInt(this.howMany);
        buffer.flip();
        while (buffer.hasRemaining())
            out.write(buffer);

        for (int i = 0; i < howMany; i++) {
            byte[] data = new BigInteger(Integer.toString(i)).toByteArray();
            buffer = ByteBuffer.allocate(4 + data.length);

            buffer.putInt(data.length);
            buffer.put(data);
            buffer.flip();

            while (buffer.hasRemaining())
                out.write(buffer);
        }
        out.close();
        System.err.println("Closed");
    } catch (IOException ex) {
        System.err.println(ex);
    }
}

From source file:com.serotonin.bacnet4j.util.sero.StreamUtils.java

public static void transfer(InputStream in, SocketChannel out) throws IOException {
    byte[] buf = new byte[1024];
    ByteBuffer bbuf = ByteBuffer.allocate(1024);
    int len;/*from  www  .j  a va  2  s.c  om*/
    while ((len = in.read(buf)) != -1) {
        bbuf.put(buf, 0, len);
        bbuf.flip();
        while (bbuf.remaining() > 0)
            out.write(bbuf);
        bbuf.clear();
    }
}

From source file:ja.lingo.engine.util.EngineFiles.java

private static void appendFile(String fileName, FileOutputStream fos, boolean prependWithLength)
        throws IOException {
    FileInputStream fis = new FileInputStream(fileName);
    FileChannel fic = fis.getChannel();
    FileChannel foc = fos.getChannel();

    ByteBuffer buffer = ByteBuffer.allocate(COPY_BUFFER_SIZE);

    // put header: length (1 int = 4 bytes)
    if (prependWithLength) {
        buffer.putInt((int) new File(fileName).length());
    }/* w w w  .j  a  v a 2s .co m*/

    // put body
    do {
        buffer.flip();
        foc.write(buffer);
        buffer.clear();
    } while (fic.read(buffer) != -1);
    fic.close();
    // NOTE: do not close 'foc'

    Files.delete(fileName);
}

From source file:com.datatorrent.contrib.hdht.PurgeTest.java

Slice newSlice(int i) {
    return new Slice(ByteBuffer.allocate(4).putInt(i).array());
}

From source file:com.netflix.aegisthus.pig.AegisthusLoadCaster.java

@Override
public Double bytesToDouble(byte[] arg0) throws IOException {
    if (arg0 == null || arg0.length == 0) {
        return null;
    }// w  ww  .jav  a2s. c  om
    try {
        byte[] by = hex.decode(arg0);
        ByteBuffer bb = ByteBuffer.allocate(by.length);
        bb.put(by);
        bb.position(0);
        return bb.getDouble();
    } catch (Exception e) {
        LOG.error("failed to convert " + new String(arg0) + " to double");
        return null;
    }
}

From source file:com.pushtechnology.diffusion.examples.runnable.RandomData.java

/**
 * Serialize a {@link RandomData} value as a {@link Binary} value.
 * @param randomData The {@link RandomData} value
 * @return The {@link Binary} value//from   ww  w  .ja  v  a 2 s.c  om
 */
static Binary toBinary(RandomData randomData) {
    final ByteBuffer buffer = ByteBuffer.allocate(16);
    buffer.putInt(randomData.getId());
    buffer.putLong(randomData.getTimestamp());
    buffer.putInt(randomData.getRandomInt());
    return Diffusion.dataTypes().binary().readValue(buffer.array());
}

From source file:Main.java

private static ByteBuffer encode(CharBuffer in, CharsetEncoder encoder) {
    int length = (int) (in.remaining() * (double) encoder.averageBytesPerChar());
    ByteBuffer out = ByteBuffer.allocate(length);

    encoder.reset();/*from  w w  w.j av a  2s .c o m*/
    CoderResult flushResult = null;

    while (flushResult != CoderResult.UNDERFLOW) {
        CoderResult encodeResult = encoder.encode(in, out, true);
        if (encodeResult == CoderResult.OVERFLOW) {
            out = allocateMore(out);
            continue;
        }

        flushResult = encoder.flush(out);
        if (flushResult == CoderResult.OVERFLOW) {
            out = allocateMore(out);
        }
    }

    out.flip();
    return out;
}

From source file:com.davidcode.code.util.ErrorBuffer.java

/**
 * Creates an ErrorBuffer with a specified buffer size
 * Allocates two bytes for the length of the data for the server
 * to read// ww w .  j  a  va2s  .c  o m
 *
 * @param size
 */
public ErrorBuffer(int size) {
    buffer = ByteBuffer.allocate(size);
    buffer.position(2);
}

From source file:edu.berkeley.sparrow.examples.ProtoFrontendAsync.java

public static List<TTaskSpec> generateJob(int numTasks, int benchmarkId, int benchmarkIterations) {
    // Pack task parameters
    ByteBuffer message = ByteBuffer.allocate(8);
    message.putInt(benchmarkId);//from  w  ww.  jav  a  2s . c om
    message.putInt(benchmarkIterations);

    List<TTaskSpec> out = new ArrayList<TTaskSpec>();
    for (int taskId = 0; taskId < numTasks; taskId++) {
        TTaskSpec spec = new TTaskSpec();
        spec.setTaskId(Integer.toString(taskId));
        spec.setMessage(message.array());
        out.add(spec);
    }
    return out;
}

From source file:Main.java

public static byte[] padLeft(byte[] tgt, int len, byte padding) {
    if (tgt.length >= len) {
        return tgt;
    }/*from   w w  w  . ja va2s. c  o  m*/
    ByteBuffer buffer = ByteBuffer.allocate(len);
    byte[] paddings = new byte[len - tgt.length];
    Arrays.fill(paddings, padding);

    buffer.put(paddings);
    buffer.put(tgt);

    return buffer.array();
}