Example usage for java.nio ByteBuffer allocate

List of usage examples for java.nio ByteBuffer allocate

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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:tachyon.master.RawTablesTest.java

@Test
public void writeImageTest() throws IOException, TachyonException {
    // crate the RawTables, byte buffers, and output streams
    RawTables rt = new RawTables(new TachyonConf());
    ByteBuffer bb1 = ByteBuffer.allocate(1);
    ByteBuffer bb2 = ByteBuffer.allocate(1);
    ByteBuffer bb3 = ByteBuffer.allocate(1);

    ByteArrayOutputStream os = new ByteArrayOutputStream();
    DataOutputStream dos = new DataOutputStream(os);
    ObjectMapper mapper = JsonObject.createObjectMapper();
    ObjectWriter writer = mapper.writer();

    // add elements to the RawTables
    rt.addRawTable(0, 1, bb1);/*from   www .  ja va2s  .  c om*/
    rt.addRawTable(1, 1, bb2);
    rt.addRawTable(2, 1, bb3);

    // write the image
    rt.writeImage(writer, dos);

    List<Integer> ids = Arrays.asList(0, 1, 2);
    List<Integer> columns = Arrays.asList(1, 1, 1);
    List<ByteBuffer> data = Arrays.asList(bb1, bb2, bb3);

    // decode the written bytes
    ImageElement decoded = mapper.readValue(os.toByteArray(), ImageElement.class);

    // test the decoded ImageElement
    Assert.assertEquals(ids, decoded.get("ids", new TypeReference<List<Integer>>() {
    }));
    Assert.assertEquals(columns, decoded.get("columns", new TypeReference<List<Integer>>() {
    }));
    Assert.assertEquals(data, decoded.get("data", new TypeReference<List<ByteBuffer>>() {
    }));
}

From source file:io.blobkeeper.file.util.FileUtils.java

public static boolean isFileEmpty(@NotNull File file, @NotNull IndexElt elt) {
    ByteBuffer fourBytes = ByteBuffer.allocate(4);
    try {/*from   w  w  w  .ja  v  a2s  .c om*/
        file.getFileChannel().read(fourBytes, elt.getOffset());
    } catch (IOException e) {
        log.error("Can't read blob file", e);
        throw new IllegalArgumentException(e);
    }

    fourBytes.flip();
    for (byte b : fourBytes.array()) {
        if (b != 0) {
            return false;
        }
    }

    return true;
}

From source file:internal.diff.aws.service.AmazonS3ETagFileChecksumServiceImpl.java

@Override
public String calculateChecksum(Path file) throws IOException {

    long fileSize = Files.size(file);

    int parts = (int) (fileSize / S3_MULTIPART_SIZE_LIMIT_IN_BYTES);
    parts += fileSize % S3_MULTIPART_SIZE_LIMIT_IN_BYTES > 0 ? 1 : 0;

    ByteBuffer checksumBuffer = ByteBuffer.allocate(parts * 16);

    SeekableByteChannel byteChannel = Files.newByteChannel(file);

    for (int part = 0; part < parts; part++) {

        int partSizeInBytes;

        if (part < parts - 1 || fileSize % S3_MULTIPART_SIZE_LIMIT_IN_BYTES == 0) {
            partSizeInBytes = S3_MULTIPART_SIZE_LIMIT_IN_BYTES;
        } else {/*w  w w  . j  a  v a2  s.  c  o m*/
            partSizeInBytes = (int) (fileSize % S3_MULTIPART_SIZE_LIMIT_IN_BYTES);
        }

        ByteBuffer partBuffer = ByteBuffer.allocate(partSizeInBytes);

        boolean endOfFile;
        do {
            endOfFile = byteChannel.read(partBuffer) == -1;
        } while (!endOfFile && partBuffer.hasRemaining());

        checksumBuffer.put(DigestUtils.md5(partBuffer.array()));
    }

    if (parts > 1) {
        return DigestUtils.md5Hex(checksumBuffer.array()) + "-" + parts;
    } else {
        return Hex.encodeHexString(checksumBuffer.array());
    }
}

From source file:edu.kit.trufflehog.model.network.MacAddress.java

public MacAddress(long address) throws InvalidMACAddress {

    this.address = address;

    if (this.address > 0xFFFFFFFFFFFFL || this.address < 0) {
        throw new InvalidMACAddress(address);
    }/*from  w  w w .  j a  va2 s  .  com*/

    hashcode = (new Long(address)).hashCode();
    // transform to byte array
    final byte[] extractedBytes = ByteBuffer.allocate(8).putLong(address).array();
    bytes = Arrays.copyOfRange(extractedBytes, 2, 8);

    // set multicast bit
    isMulticast = (bytes[0] & 1) == 1;

    // set string representation
    final List<Byte> bytes = Arrays.asList(ArrayUtils.toObject(toByteArray()));
    addressString = bytes.stream().map(b -> String.format("%02x", b)).collect(Collectors.joining(":"));
}

From source file:Main.java

public static byte[] makeFontBitmap(String font, String code, int size, float[] arrayOfPos) {
    Log.v(TAG, String.format("makeFontBitmap called(Java): font=%s code=%s", font, code));
    Canvas c = new Canvas();
    Paint p = new Paint();
    //        Log.v(TAG, "get density");
    float density = context.getResources().getDisplayMetrics().density;
    Log.v(TAG, String.format("makeFontBitmap density: %f", density));
    p.setTextSize((float) size * density);
    p.setAntiAlias(true);/*from   w  ww  . ja v a  2  s  .  c om*/

    Rect textBounds = new Rect();
    p.getTextBounds(code, 0, code.length(), textBounds);
    Log.v(TAG, String.format("makeFontBitmap textBounds: %d,%d,%d,%d", textBounds.left, textBounds.top,
            textBounds.right, textBounds.bottom));

    Rect textBoundsAxA = new Rect();
    String axa = String.format("A%sA", code);
    p.getTextBounds(axa, 0, axa.length(), textBoundsAxA);
    Rect textBoundsAA = new Rect();
    String aa = "AA";
    p.getTextBounds(aa, 0, aa.length(), textBoundsAA);

    // cache.distDelta = Vec2(0, 0);
    arrayOfPos[0] = textBounds.left;
    arrayOfPos[1] = textBounds.top;

    // cache.srcWidth = Vec2(16, 16);
    arrayOfPos[2] = textBounds.width();
    arrayOfPos[3] = textBounds.height();

    // cache.step = 16;
    //      arrayOfPos[4] = textBounds.width() + 1;
    arrayOfPos[4] = textBoundsAxA.width() - textBoundsAA.width();

    if (textBounds.width() == 0 || textBounds.height() == 0) {
        Log.v(TAG, "makeFontBitmap: empty");
        return null;
    }

    Bitmap b = Bitmap.createBitmap(textBounds.width(), textBounds.height(), Bitmap.Config.ARGB_8888);
    c.setBitmap(b);

    Rect r = new Rect(0, 0, textBounds.width(), textBounds.height());
    //      p.setColor(Color.RED);
    p.setARGB(0, 0, 0, 0);
    c.drawRect(r, p);
    p.setARGB(255, 255, 255, 255);

    //        Log.v(TAG, "makeFontBitmap: drawText");
    c.drawText(code, -textBounds.left, -textBounds.top, p);
    Log.v(TAG, String.format("makeFontBitmap: w=%.2f h=%.2f", arrayOfPos[2], arrayOfPos[3]));

    ByteBuffer buf = ByteBuffer.allocate(textBounds.width() * textBounds.height() * 4);
    //      ByteBuffer buf = ByteBuffer.allocate(b.getRowBytes());
    Log.v(TAG, String.format("makeFontBitmap: b.getRowBytes() %d", b.getRowBytes()));
    buf.position(0);
    b.copyPixelsToBuffer(buf);
    Log.v(TAG, String.format("makeFontBitmap results: capacity=%d", buf.capacity()));

    //      byte bytes[] = buf.array();
    //      for (int i = 0; i < size * size * 2; i++)
    //         bytes[i] = (byte)(Math.random() * 255);
    return buf.array();
}

From source file:Main.java

@Override
public void completed(AsynchronousSocketChannel client, Attachment attach) {
    try {/*ww  w.  j av a2  s . c  o m*/
        SocketAddress clientAddr = client.getRemoteAddress();
        System.out.format("Accepted a  connection from  %s%n", clientAddr);
        attach.server.accept(attach, this);
        ReadWriteHandler rwHandler = new ReadWriteHandler();
        Attachment newAttach = new Attachment();
        newAttach.server = attach.server;
        newAttach.client = client;
        newAttach.buffer = ByteBuffer.allocate(2048);
        newAttach.isRead = true;
        newAttach.clientAddr = clientAddr;
        client.read(newAttach.buffer, newAttach, rwHandler);
    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:com.talis.storage.s3.ExternalizableS3ObjectTest.java

@Test
public void roundTripS3ObjectSerialization() throws Exception {
    ByteArrayOutputStream tmp = new ByteArrayOutputStream();
    ObjectOutputStream out = new ObjectOutputStream(tmp);

    byte[] bytes = ("When replying to any emails you have prior to migration "
            + "(ie any in your inbox before you have been migrated) "
            + "you will need to change the way you reply to them").getBytes();

    ByteBuffer buffer = ByteBuffer.allocate(bytes.length);
    buffer.put(bytes);//from ww  w  .j av a  2 s .com

    S3ObjectFactory factory = new S3ObjectFactory("bucket");
    S3Object original = factory.newObject("foo", 0, MediaType.TEXT_PLAIN_TYPE, buffer);

    out.writeObject(original);
    out.flush();
    out.close();

    byte[] serialized = tmp.toByteArray();

    ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(serialized));
    S3Object clone = (S3Object) in.readObject();

    assertObjectsEqual(original, clone);
}

From source file:Main.java

/**
 * Creates the Uri string with embedded expansion codes.
 *
 * @param uri to be encoded//  w  w w.  j a  v a2 s .  c o m
 * @return the Uri string with expansion codes.
 */
public static byte[] encodeUri(String uri) {
    if (uri == null || uri.length() == 0) {
        Log.i(TAG, "null or empty uri");
        return new byte[0];
    }
    ByteBuffer bb = ByteBuffer.allocate(uri.length());
    // UUIDs are ordered as byte array, which means most significant first
    bb.order(ByteOrder.BIG_ENDIAN);
    int position = 0;

    // Add the byte code for the scheme or return null if none
    Byte schemeCode = encodeUriScheme(uri);
    if (schemeCode == null) {
        Log.i(TAG, "null scheme code");
        return null;
    }
    String scheme = URI_SCHEMES.get(schemeCode);
    bb.put(schemeCode);
    position += scheme.length();

    if (URLUtil.isNetworkUrl(scheme)) {
        Log.i(TAG, "is network URL");
        return encodeUrl(uri, position, bb);
    } else if ("urn:uuid:".equals(scheme)) {
        Log.i(TAG, "is UUID");
        return encodeUrnUuid(uri, position, bb);
    }
    return null;
}

From source file:com.hazelcast.simulator.probes.xml.HistogramConverter.java

@Override
public void marshal(Object object, HierarchicalStreamWriter writer, MarshallingContext marshallingContext) {
    Histogram histogram = (Histogram) object;
    int size = histogram.getNeededByteBufferCapacity();
    ByteBuffer byteBuffer = ByteBuffer.allocate(size);
    int bytesWritten = histogram.encodeIntoCompressedByteBuffer(byteBuffer);
    byteBuffer.rewind();//from w w w  .  ja va 2  s  .  c  o m
    byteBuffer.limit(bytesWritten);
    String encodedHistogram = encodeBase64String(byteBuffer.array());

    writer.setValue(encodedHistogram);
}

From source file:de.kapsi.net.daap.nio.DaapRequestReaderNIO.java

/** Creates a new instance of DaapRequestReader */
public DaapRequestReaderNIO(DaapConnectionNIO connection) {

    this.connection = connection;

    in = ByteBuffer.allocate(1024);
    in.clear();//from w  ww  . j a v  a 2  s  .c o  m
    in.flip();

    lineReader = new DaapLineReaderNIO(connection.getChannel());
    headers = new ArrayList();
    pending = new LinkedList();
}