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:com.act.lcms.v2.fullindex.BuilderTest.java

@Test
public void testAppendOrRealloc() throws Exception {
    ByteBuffer dest = ByteBuffer.allocate(4);
    assertEquals("Initial buffer capacity matches expected", 4, dest.capacity());
    dest = Utils.appendOrRealloc(dest, ByteBuffer.wrap(new byte[] { 'a', 'b', 'c', 'd' })); // No need to flip w/ wrap().
    assertEquals("Post-append (fits) buffer capacity matches expected", 4, dest.capacity());
    assertEquals("Post-append (fits) buffer position matches expected", 4, dest.position());
    dest = Utils.appendOrRealloc(dest, ByteBuffer.wrap(new byte[] { 'e' }));
    assertEquals("Post-append (too large) buffer capacity has doubled", 8, dest.capacity());
    assertEquals("Post-append (too large) buffer position matches expected", 5, dest.position());
    dest = Utils.appendOrRealloc(dest, ByteBuffer.wrap(new byte[] { 'f', 'g', 'h' }));
    assertEquals("Post-append (fits) buffer capacity matches expected", 8, dest.capacity());
    assertEquals("Post-append (fits) buffer position matches expected", 8, dest.position());
    dest = Utils.appendOrRealloc(dest, ByteBuffer.wrap(new byte[] { 'i' }));
    assertEquals("Post-append (too large) buffer capacity has doubled", 16, dest.capacity());
    assertEquals("Post-append (too large) buffer position matches expected", 9, dest.position());

}

From source file:com.slytechs.capture.file.editor.FileEditorImpl.java

public void add(final ByteBuffer b, final long global) throws IOException {
    final long length = b.limit() - b.position();

    // Create a partial loader for our cache memory buffer and do the insert
    final PartialLoader record = new MemoryCacheLoader(b, true, headerReader);
    this.edits.insert(global, length, record);

    this.autoflushChange(length);
}

From source file:edu.umn.cs.spatialHadoop.indexing.BTRPartitioner.java

@Override
public void write(DataOutput out) throws IOException {
    mbr.write(out);/*from   w  w  w  . j a  v a 2  s .  com*/
    out.writeInt(columns);
    out.writeInt(rows);
    ByteBuffer bbuffer = ByteBuffer.allocate((xSplits.length + ySplits.length) * 8);
    for (double xSplit : xSplits)
        bbuffer.putDouble(xSplit);
    for (double ySplit : ySplits)
        bbuffer.putDouble(ySplit);
    if (bbuffer.hasRemaining())
        throw new RuntimeException("Did not calculate buffer size correctly");
    out.write(bbuffer.array(), bbuffer.arrayOffset(), bbuffer.position());
}

From source file:edu.uci.ics.hyracks.dataflow.std.sort.util.DeletableFrameTupleAppenderTest.java

@Test
public void testReset() throws Exception {
    ByteBuffer buffer = ByteBuffer.allocate(cap);
    appender.reset(buffer);//from   w ww .  java2s . c  o  m
    assertTrue(appender.getBuffer() == buffer);
    assertTrue(appender.getTupleCount() == 0);
    assertTrue(appender.getContiguousFreeSpace() == cap - 4 - 4);

    int count = 10;
    int deleted = 7;
    buffer = makeAFrame(cap, count, deleted);
    int pos = buffer.position();
    appender.reset(buffer);
    assertTrue(appender.getBuffer() == buffer);
    assertTrue(appender.getTupleCount() == count);
    assertTrue(appender.getContiguousFreeSpace() == cap - 4 - 4 - count * 4 - pos);
    assertTrue(appender.getTotalFreeSpace() == appender.getContiguousFreeSpace() + deleted);

    int dataOffset = 0;
    for (int i = 0; i < count; i++) {
        dataOffset += assertTupleIsExpected(i, dataOffset);
    }
}

From source file:edu.umn.cs.spatialHadoop.nasa.HDFRasterLayer.java

@Override
public void write(DataOutput out) throws IOException {
    super.write(out);
    out.writeLong(timestamp);/* ww w  .j a v a 2 s.c  om*/
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    GZIPOutputStream gzos = new GZIPOutputStream(baos);
    ByteBuffer bbuffer = ByteBuffer.allocate(getHeight() * 2 * 8 + 8);
    bbuffer.putInt(getWidth());
    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.putLong(sum[x][y]);
            bbuffer.putLong(count[x][y]);
        }
        gzos.write(bbuffer.array(), 0, bbuffer.position());
    }
    gzos.close();

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

From source file:de.csdev.ebus.command.EBusCommandUtils.java

/**
 * @param commandChannel//from  www . j ava2s.  c o m
 * @return
 */
public static ByteBuffer getMasterTelegramMask(IEBusCommandMethod commandChannel) {

    // byte len = 0;
    ByteBuffer buf = ByteBuffer.allocate(50);
    buf.put(commandChannel.getSourceAddress() == null ? (byte) 0x00 : (byte) 0xFF); // QQ - Source
    buf.put(commandChannel.getDestinationAddress() == null ? (byte) 0x00 : (byte) 0xFF); // ZZ - Target
    buf.put(new byte[] { (byte) 0xFF, (byte) 0xFF }); // PB SB - Command
    buf.put((byte) 0xFF); // NN - Length

    if (commandChannel.getMasterTypes() != null) {
        for (IEBusValue entry : commandChannel.getMasterTypes()) {
            IEBusType<?> type = entry.getType();

            if (entry.getName() == null && type instanceof EBusTypeBytes && entry.getDefaultValue() != null) {
                for (int i = 0; i < type.getTypeLength(); i++) {
                    buf.put((byte) 0xFF);
                }
            } else {
                for (int i = 0; i < type.getTypeLength(); i++) {
                    buf.put((byte) 0x00);

                }
            }
        }
    }

    buf.put((byte) 0x00); // Master CRC

    // set limit and reset position
    buf.limit(buf.position());
    buf.position(0);

    return buf;
}

From source file:cn.iie.haiep.hbase.value.Bytes.java

/**
 * This method will get a sequence of bytes from pos -> limit,
 * but will restore pos after.//from   ww w .ja va  2 s .com
 * @param buf
 * @return byte array
 */
public static byte[] getBytes(ByteBuffer buf) {
    int savedPos = buf.position();
    byte[] newBytes = new byte[buf.remaining()];
    buf.get(newBytes);
    buf.position(savedPos);
    return newBytes;
}

From source file:edu.tsinghua.lumaqq.qq.packets.Packet.java

/**
 * bufOutPacketbuf?????/*  ww w .j  a va 2  s.  co m*/
 * 
 * @param buf
 *          ByteBuffer
 * @throws PacketParseException
 *          ?
 */
protected Packet(ByteBuffer buf, QQUser user) throws PacketParseException {
    this(buf, buf.limit() - buf.position(), user);
}

From source file:com.talis.storage.s3.S3StoreTest.java

@Override
protected Store getStore() throws Exception {
    bucketname = UUID.randomUUID().toString();
    Provider<S3Service> serviceProvider = initialiseServiceProvider();

    final S3Object stubObject = new S3Object("foo");
    objectFactory = new S3ObjectFactory(bucketname) {
        @Override//  w w w .j  av  a2 s  . c  om
        public ExternalizableS3Object newObject(String key, int index, MediaType mediaType, ByteBuffer buffer)
                throws IOException {
            ExternalizableS3Object obj = new ExternalizableS3Object();
            obj.setKey(key + "/" + index);
            obj.setContentType(S3Store.TMB_CHUNK_TYPE.toString());
            obj.addMetadata(S3Store.ACTUAL_CONTENT_TYPE_HEADER, mediaType.toString());
            byte[] bytes = new byte[buffer.position()];
            buffer.rewind();
            buffer.get(bytes);
            obj.setDataInputStream(new ByteArrayInputStream(bytes));
            return obj;
        }
    };
    chunkHandler = new StubChunkHandler();

    return new S3Store(objectFactory, chunkHandler);
}