Example usage for java.nio ByteBuffer slice

Introduction

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

Prototype

public abstract ByteBuffer slice();

Source Link

Document

Returns a sliced buffer that shares its content with this buffer.

Usage

From source file:com.easemob.dataexport.utils.ConversionUtils.java

public static double getDouble(ByteBuffer bytes) {
    return bytes.slice().getDouble();
}

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From source file:org.apache.usergrid.persistence.map.impl.MapSerializationImpl.java

public static ByteBuffer serializeKeys(UUID ownerUUID, String ownerType, String mapName, String mapKey,
        int bucketNumber) {

    List<Object> keys = new ArrayList<>(4);
    keys.add(0, ownerUUID);/*from   w w w  . j av a 2 s. c  o  m*/
    keys.add(1, ownerType);
    keys.add(2, mapName);
    keys.add(3, mapKey);

    if (bucketNumber > 0) {
        keys.add(4, bucketNumber);
    }

    // UUIDs are 16 bytes, allocate the buffer accordingly
    int size = 16 + ownerType.getBytes().length + mapName.getBytes().length + mapKey.getBytes().length;
    if (bucketNumber > 0) {
        // ints are 4 bytes
        size += 4;
    }

    // we always need to add length for the 2 byte short and 1 byte equality
    size += keys.size() * 3;

    ByteBuffer stuff = ByteBuffer.allocate(size);

    for (Object key : keys) {

        ByteBuffer kb = DataType.serializeValue(key, ProtocolVersion.NEWEST_SUPPORTED);
        if (kb == null) {
            kb = ByteBuffer.allocate(0);
        }

        stuff.putShort((short) kb.remaining());
        stuff.put(kb.slice());
        stuff.put((byte) 0);

    }
    stuff.flip();
    return stuff.duplicate();

}

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From source file:Main.java

/**
 * Returns new byte buffer whose content is a shared subsequence of this buffer's content
 * between the specified start (inclusive) and end (exclusive) positions. As opposed to
 * {@link ByteBuffer#slice()}, the returned buffer's byte order is the same as the source
 * buffer's byte order.//w  w  w  . jav a 2s.  co  m
 */
private static ByteBuffer sliceFromTo(final ByteBuffer source, final int start, final int end) {
    if (start < 0) {
        throw new IllegalArgumentException("start: " + start);
    }
    if (end < start) {
        throw new IllegalArgumentException("end < start: " + end + " < " + start);
    }
    final int capacity = source.capacity();
    if (end > source.capacity()) {
        throw new IllegalArgumentException("end > capacity: " + end + " > " + capacity);
    }
    final int originalLimit = source.limit();
    final int originalPosition = source.position();
    try {
        source.position(0);
        source.limit(end);
        source.position(start);
        final ByteBuffer result = source.slice();
        result.order(source.order());
        return result;
    } finally {
        source.position(0);
        source.limit(originalLimit);
        source.position(originalPosition);
    }
}

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From source file:org.apache.usergrid.persistence.index.utils.ConversionUtils.java

public static Object object(Class<?> type, ByteBuffer bytes) {

    try {/*from   w  ww  . ja v  a  2  s.  c o  m*/
        if (Long.class.isAssignableFrom(type)) {
            return bytes.slice().getLong();
        } else if (UUID.class.isAssignableFrom(type)) {
            return uuid(bytes);
        } else if (String.class.isAssignableFrom(type)) {
            return string(bytes);
        } else if (Boolean.class.isAssignableFrom(type)) {
            return bytes.slice().get() != 0;
        } else if (Integer.class.isAssignableFrom(type)) {
            return bytes.slice().getInt();
        } else if (Double.class.isAssignableFrom(type)) {
            return bytes.slice().getDouble();
        } else if (Float.class.isAssignableFrom(type)) {
            return bytes.slice().getFloat();
        } else if (ByteBuffer.class.isAssignableFrom(type)) {
            return bytes.duplicate();
        } else if (byte[].class.isAssignableFrom(type)) {
            byte[] b = new byte[bytes.remaining()];
            bytes.slice().get(b);
            return b;
        }
    } catch (Exception e) {
        logger.error("Unable to get object from bytes for type {}", type.getName(), e);
    }
    return null;
}

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From source file:com.easemob.dataexport.utils.ConversionUtils.java

public static Object object(Class<?> type, ByteBuffer bytes) {

    try {//from w w w  . j  a  v a2s .  co  m
        if (Long.class.isAssignableFrom(type)) {
            return bytes.slice().getLong();
        } else if (UUID.class.isAssignableFrom(type)) {
            return uuid(bytes);
        } else if (String.class.isAssignableFrom(type)) {
            return string(bytes);
        } else if (Boolean.class.isAssignableFrom(type)) {
            return bytes.slice().get() != 0;
        } else if (Integer.class.isAssignableFrom(type)) {
            return bytes.slice().getInt();
        } else if (Double.class.isAssignableFrom(type)) {
            return bytes.slice().getDouble();
        } else if (Float.class.isAssignableFrom(type)) {
            return bytes.slice().getFloat();
        } else if (ByteBuffer.class.isAssignableFrom(type)) {
            return bytes.duplicate();
        } else if (byte[].class.isAssignableFrom(type)) {
            byte[] b = new byte[bytes.remaining()];
            bytes.slice().get(b);
            return b;
        }
    } catch (Exception e) {
        logger.error("Unable to get object from bytes for type " + type.getName(), e);
    }
    return null;
}

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From source file:com.easemob.dataexport.utils.ConversionUtils.java

public static UUID uuid(ByteBuffer bb) {
    if (bb == null) {
        return null;
    }/*from w  ww  .j  av  a 2 s  . c om*/
    if (bb.remaining() < 16) {
        return null;
    }
    bb = bb.slice();
    return new UUID(bb.getLong(), bb.getLong());
}

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From source file:net.darkmist.alib.io.BufferUtil.java

/**
 * Sane ByteBuffer slice/*from   w  w w  . java  2 s.com*/
 * @param buf the buffer to slice something out of
 * @param off The offset into the buffer
 * @param len the length of the part to slice out
 */
public static ByteBuffer slice(ByteBuffer buf, int off, int len) {
    ByteBuffer localBuf = buf.duplicate(); // so we don't mess up the position,etc
    logger.debug("off={} len={}", off, len);
    localBuf.position(off);
    localBuf.limit(off + len);
    logger.debug("pre-slice: localBuf.position()={} localBuf.limit()={}", localBuf.position(),
            localBuf.limit());
    localBuf = localBuf.slice();
    logger.debug("post-slice: localBuf.position()={} localBuf.limit()={}", localBuf.position(),
            localBuf.limit());
    return localBuf;
}

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From source file:org.lenskit.data.packed.BinaryRatingDAO.java

static BinaryRatingDAO fromBuffer(ByteBuffer buffer) {
    // start by reading header from the buffer
    BinaryHeader header = BinaryHeader.fromHeader(buffer);
    assert buffer.position() >= BinaryHeader.HEADER_SIZE;
    // the header read advanced the buffer position past the header; prepare a data slice
    // first slice to remove the header
    ByteBuffer data = buffer.slice();
    // then limit to the rating data size
    data.limit(header.getRatingDataSize());
    assert data.remaining() == header.getRatingDataSize();

    // prepare to read tables
    ByteBuffer tableBuffer = buffer.duplicate();
    // skip the header and the rating data
    tableBuffer.position(tableBuffer.position() + header.getRatingDataSize());
    // each of the following reads advances the buffer by the amount read
    BinaryIndexTable utbl = BinaryIndexTable.fromBuffer(header.getUserCount(), tableBuffer);
    BinaryIndexTable itbl = BinaryIndexTable.fromBuffer(header.getItemCount(), tableBuffer);

    return new BinaryRatingDAO(null, header, data, utbl, itbl, header.getRatingCount(), Long.MAX_VALUE);
}

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From source file:org.grouplens.lenskit.data.dao.packed.BinaryRatingDAO.java

static BinaryRatingDAO fromBuffer(ByteBuffer buffer) {
    BinaryHeader header = BinaryHeader.fromHeader(buffer);
    assert buffer.position() >= BinaryHeader.HEADER_SIZE;
    ByteBuffer dup = buffer.duplicate();
    dup.limit(header.getRatingDataSize());

    ByteBuffer tableBuffer = buffer.duplicate();
    tableBuffer.position(tableBuffer.position() + header.getRatingDataSize());
    BinaryIndexTable utbl = BinaryIndexTable.fromBuffer(header.getUserCount(), tableBuffer);
    BinaryIndexTable itbl = BinaryIndexTable.fromBuffer(header.getItemCount(), tableBuffer);

    return new BinaryRatingDAO(null, header, dup.slice(), utbl, itbl);
}

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From source file:org.wso2.andes.amqp.QpidAndesBridge.java

/**
 * message content chunk received to the server
 *
 * @param messageID       id of message to which content belongs
 * @param offsetInMessage chunk offset/*from   w  w  w  . ja  v  a 2 s . c  o  m*/
 * @param src             Bytebuffer with content bytes
 */
public static AndesMessagePart messageContentChunkReceived(long messageID, int offsetInMessage,
        ByteBuffer src) {

    if (log.isDebugEnabled()) {
        log.debug("Content Part Received id " + messageID + ", offset " + offsetInMessage);
    }
    AndesMessagePart part = new AndesMessagePart();
    src = src.slice();
    final byte[] chunkData = new byte[src.limit()];
    src.duplicate().get(chunkData);

    part.setData(chunkData);
    part.setMessageID(messageID);
    part.setOffSet(offsetInMessage);

    return part;
}

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