Example usage for java.nio ByteBuffer limit

Introduction

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

Prototype

public final Buffer limit(int newLimit) 

Source Link

Document

Sets the limit of this buffer.

Usage

From source file:eu.stratosphere.arraymodel.io.StringInputFormat.java

public boolean readRecord(Value[] target, byte[] bytes, int offset, int numBytes) {
    StringValue str = this.theString;

    if (this.ascii) {
        str.setValueAscii(bytes, offset, numBytes);
    } else {//from   w  ww .  ja  v a 2s.c  om
        ByteBuffer byteWrapper = this.byteWrapper;
        if (bytes != byteWrapper.array()) {
            byteWrapper = ByteBuffer.wrap(bytes, 0, bytes.length);
            this.byteWrapper = byteWrapper;
        }
        byteWrapper.clear();
        byteWrapper.position(offset);
        byteWrapper.limit(offset + numBytes);

        try {
            CharBuffer result = this.decoder.decode(byteWrapper);
            str.setValue(result);
        } catch (CharacterCodingException e) {
            byte[] copy = new byte[numBytes];
            System.arraycopy(bytes, offset, copy, 0, numBytes);
            LOG.warn("Line could not be encoded: " + Arrays.toString(copy), e);
            return false;
        }
    }

    target[0] = str;
    return true;
}

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From source file:eu.stratosphere.pact.array.io.StringInputFormat.java

public boolean readRecord(Value[] target, byte[] bytes, int offset, int numBytes) {
    PactString str = this.theString;

    if (this.ascii) {
        str.setValueAscii(bytes, offset, numBytes);
    } else {//w  w  w  . j  a  v  a 2  s  .c o m
        ByteBuffer byteWrapper = this.byteWrapper;
        if (bytes != byteWrapper.array()) {
            byteWrapper = ByteBuffer.wrap(bytes, 0, bytes.length);
            this.byteWrapper = byteWrapper;
        }
        byteWrapper.clear();
        byteWrapper.position(offset);
        byteWrapper.limit(offset + numBytes);

        try {
            CharBuffer result = this.decoder.decode(byteWrapper);
            str.setValue(result);
        } catch (CharacterCodingException e) {
            byte[] copy = new byte[numBytes];
            System.arraycopy(bytes, offset, copy, 0, numBytes);
            LOG.warn("Line could not be encoded: " + Arrays.toString(copy), e);
            return false;
        }
    }

    target[0] = str;
    return true;
}

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From source file:com.ery.ertc.estorm.util.ByteBufferArray.java

/**
 * Access(read or write) this buffer array with a position and length as the given array. Here we will only lock one buffer even if it
 * may be need visit several buffers. The consistency is guaranteed by the caller.
 * /*from www.ja v  a  2  s .c  o m*/
 * @param start
 *            start offset of this buffer array
 * @param len
 *            The maximum number of bytes to be accessed
 * @param array
 *            The array from/to which bytes are to be read/written
 * @param arrayOffset
 *            The offset within the given array of the first byte to be read or written
 * @param visitor
 *            implement of how to visit the byte buffer
 */
void multiple(long start, int len, byte[] array, int arrayOffset, Visitor visitor) {
    assert len >= 0;
    long end = start + len;
    int startBuffer = (int) (start / bufferSize), startOffset = (int) (start % bufferSize);
    int endBuffer = (int) (end / bufferSize), endOffset = (int) (end % bufferSize);
    assert array.length >= len + arrayOffset;
    assert startBuffer >= 0 && startBuffer < bufferCount;
    assert endBuffer >= 0 && endBuffer < bufferCount || (endBuffer == bufferCount && endOffset == 0);
    if (startBuffer >= locks.length || startBuffer < 0) {
        String msg = "Failed multiple, start=" + start + ",startBuffer=" + startBuffer + ",bufferSize="
                + bufferSize;
        LOG.error(msg);
        throw new RuntimeException(msg);
    }
    int srcIndex = 0, cnt = -1;
    for (int i = startBuffer; i <= endBuffer; ++i) {
        Lock lock = locks[i];
        lock.lock();
        try {
            ByteBuffer bb = buffers[i];
            if (i == startBuffer) {
                cnt = bufferSize - startOffset;
                if (cnt > len)
                    cnt = len;
                bb.limit(startOffset + cnt).position(startOffset);
            } else if (i == endBuffer) {
                cnt = endOffset;
                bb.limit(cnt).position(0);
            } else {
                cnt = bufferSize;
                bb.limit(cnt).position(0);
            }
            visitor.visit(bb, array, srcIndex + arrayOffset, cnt);
            srcIndex += cnt;
        } finally {
            lock.unlock();
        }
    }
    assert srcIndex == len;
}

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From source file:org.apache.htrace.impl.PackedBufferManager.java

private void readAndValidateResponseFrame(SelectionKey sockKey, ByteBuffer buf, long expectedSeq,
        int expectedMethodId) throws IOException {
    buf.clear();//from www .  j av a  2 s  .  c o m
    buf.limit(PackedBuffer.HRPC_RESP_FRAME_LENGTH);
    doRecv(sockKey, buf);
    buf.flip();
    buf.order(ByteOrder.LITTLE_ENDIAN);
    long seq = buf.getLong();
    if (seq != expectedSeq) {
        throw new IOException("Expected sequence number " + expectedSeq + ", but got sequence number " + seq);
    }
    int methodId = buf.getInt();
    if (expectedMethodId != methodId) {
        throw new IOException("Expected method id " + expectedMethodId + ", but got " + methodId);
    }
    int errorLength = buf.getInt();
    buf.getInt();
    if ((errorLength < 0) || (errorLength > PackedBuffer.MAX_HRPC_ERROR_LENGTH)) {
        throw new IOException("Got server error with invalid length " + errorLength);
    } else if (errorLength > 0) {
        buf.clear();
        buf.limit(errorLength);
        doRecv(sockKey, buf);
        buf.flip();
        CharBuffer charBuf = StandardCharsets.UTF_8.decode(buf);
        String serverErrorStr = charBuf.toString();
        throw new IOException("Got server error " + serverErrorStr);
    }
}

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From source file:org.eclipse.packagedrone.utils.rpm.parse.RpmInputStream.java

protected RpmLead readLead() throws IOException {
    final byte[] magic = readComplete(4);

    if (!Arrays.equals(magic, Rpms.LEAD_MAGIC)) {
        throw new IOException(String.format("File corrupt: Expected magic %s, read: %s",
                Arrays.toString(Rpms.LEAD_MAGIC), Arrays.toString(magic)));
    }//  w  w w  . j  a  v a2  s .c o  m

    final byte[] version = readComplete(2);

    final short type = this.in.readShort();
    final short arch = this.in.readShort();

    final byte[] nameData = readComplete(66); // NAME

    final ByteBuffer nameBuffer = ByteBuffer.wrap(nameData);
    for (int i = 0; i < nameData.length; i++) {
        if (nameData[i] == 0) {
            nameBuffer.limit(i);
            break;
        }
    }

    final String name = StandardCharsets.UTF_8.decode(nameBuffer).toString();

    final short os = this.in.readShort();

    final int sigType = this.in.readUnsignedShort();

    skipFully(16); // RESERVED

    return new RpmLead(version[0], version[1], name, sigType, type, arch, os);
}

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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());
    result.putInt(MAGICSTART);//from   w  ww .j a  v a 2  s  .  co  m
    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:org.apache.camel.component.file.FileOperations.java

private void writeFileByStream(InputStream in, File target) throws IOException {
    FileChannel out = null;// w ww  .  j a  va 2s.  co  m
    try {
        out = prepareOutputFileChannel(target, out);

        if (LOG.isTraceEnabled()) {
            LOG.trace("Using InputStream to transfer from: " + in + " to: " + out);
        }
        int size = endpoint.getBufferSize();
        byte[] buffer = new byte[size];
        ByteBuffer byteBuffer = ByteBuffer.wrap(buffer);
        int bytesRead;
        while ((bytesRead = in.read(buffer)) != -1) {
            if (bytesRead < size) {
                byteBuffer.limit(bytesRead);
            }
            out.write(byteBuffer);
            byteBuffer.clear();
        }
    } finally {
        IOHelper.close(in, target.getName(), LOG);
        IOHelper.close(out, target.getName(), LOG);
    }
}

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From source file:org.apache.hadoop.hdfs.RemoteBlockReader2.java

@Override
public int read(ByteBuffer buf) throws IOException {
    if (curDataSlice == null || curDataSlice.remaining() == 0 && bytesNeededToFinish > 0) {
        try (TraceScope ignored = tracer.newScope("RemoteBlockReader2#readNextPacket(" + blockId + ")")) {
            readNextPacket();/*from w  ww . ja va 2s  . com*/
        }
    }
    if (curDataSlice.remaining() == 0) {
        // we're at EOF now
        return -1;
    }

    int nRead = Math.min(curDataSlice.remaining(), buf.remaining());
    ByteBuffer writeSlice = curDataSlice.duplicate();
    writeSlice.limit(writeSlice.position() + nRead);
    buf.put(writeSlice);
    curDataSlice.position(writeSlice.position());

    return nRead;
}

---

From source file:client.MultiplexingClient.java

/**
 * Creates a new packet with a size chosen randomly between
 * MIN_SIZE and MAX_SIZE. /*from  w w  w  . java2s .c  o  m*/
 */
private ByteBuffer generateNextPacket() {
    // Generate a random size between 
    int size = MIN_SIZE + r.nextInt(maxPcktSize - MIN_SIZE);
    ByteBuffer buffer = ByteBuffer.allocate(size);
    buffer.put(SimpleProtocolDecoder.STX);
    for (int i = 0; i < size - 2; i++) {
        buffer.put((byte) ('0' + (i % 10)));
    }
    buffer.put(SimpleProtocolDecoder.ETX);
    buffer.limit(buffer.position());
    buffer.flip();
    return buffer;
}

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From source file:com.google.flatbuffers.Table.java

/**
 * Get a whole vector as a ByteBuffer./*from   w  w w.j a va 2s . c o  m*/
 *
 * This is efficient, since it only allocates a new {@link ByteBuffer} object,
 * but does not actually copy the data, it still refers to the same bytes
 * as the original ByteBuffer. Also useful with nested FlatBuffers, etc.
 *
 * @param vector_offset The position of the vector in the byte buffer
 * @param elem_size The size of each element in the array
 * @return The {@link ByteBuffer} for the array
 */
protected ByteBuffer __vector_as_bytebuffer(int vector_offset, int elem_size) {
    int o = __offset(vector_offset);
    if (o == 0)
        return null;
    ByteBuffer bb = this.bb.duplicate().order(ByteOrder.LITTLE_ENDIAN);
    int vectorstart = __vector(o);
    bb.position(vectorstart);
    bb.limit(vectorstart + __vector_len(o) * elem_size);
    return bb;
}

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