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 Buffer position(int newPosition)

Source Link

Document

Sets the position of this buffer.

Usage

From source file:edu.stanford.mobisocial.dungbeetle.model.DbObject.java

private static int colorFor(Long hash) {
    float[] baseHues = Feed.getBaseHues();
    ByteBuffer bos = ByteBuffer.allocate(8);
    bos.putLong(hash);//from  w  ww. j  a  v a2s.  co  m
    byte[] hashBytes = new byte[8];
    bos.position(0);
    bos.get(hashBytes);
    SecureRandom r = new SecureRandom(hashBytes);
    float hsv[] = new float[] { baseHues[r.nextInt(baseHues.length)], r.nextFloat(), r.nextFloat() };
    hsv[0] = hsv[0] + 20 * r.nextFloat() - 10;
    hsv[1] = hsv[1] * 0.2f + 0.8f;
    hsv[2] = hsv[2] * 0.2f + 0.8f;
    return Color.HSVToColor(hsv);
}

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

/**
 * Sane ByteBuffer slice//from   w ww  . j av a  2  s  . c  om
 * @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;
}

From source file:com.glaf.core.util.ByteBufferUtils.java

/**
 * Decode a String representation.// w w w .j a  v  a2s .c o  m
 * 
 * @param buffer
 *            a byte buffer holding the string representation
 * @param position
 *            the starting position in {@code buffer} to start decoding from
 * @param length
 *            the number of bytes from {@code buffer} to use
 * @param charset
 *            the String encoding charset
 * @return the decoded string
 */
public static String string(ByteBuffer buffer, int position, int length, Charset charset)
        throws CharacterCodingException {
    ByteBuffer copy = buffer.duplicate();
    copy.position(position);
    copy.limit(copy.position() + length);
    return string(copy, charset);
}

From source file:com.glaf.core.util.ByteBufferUtils.java

/**
 * buffer, ?positoin limit ?0/*from  w  w w . j a  v a2  s .c  o  m*/
 * 
 * @param buffer
 */
public static void clear(ByteBuffer buffer) {
    if (buffer != null) {
        buffer.position(0);
        buffer.limit(0);
    }
}

From source file:com.glaf.core.util.ByteBufferUtils.java

/**
 * buffer, fill?//w  w w  .  j ava 2s.  c  om
 * 
 * @param buffer
 */
public static void clearToFill(ByteBuffer buffer) {
    if (buffer != null) {
        buffer.position(0);
        buffer.limit(buffer.capacity());
    }
}

From source file:io.github.dsheirer.record.wave.WaveWriter.java

/**
 * Creates a wave file header with a format descriptor chunk
 *//*from   w  w w. jav  a 2 s . c  om*/
public static ByteBuffer getWaveHeader(AudioFormat format) {
    ByteBuffer header = ByteBuffer.allocate(12).order(ByteOrder.LITTLE_ENDIAN);

    //RIFF/WAVE header and size
    header.put(RIFF_ID.getBytes());
    header.putInt(INITIAL_TOTAL_LENGTH);
    header.put(WAVE_ID.getBytes());

    //Reset the buffer pointer to 0
    header.position(0);

    return header;
}

From source file:LamportBasicVersion.java

private static String byteToString(ByteBuffer byteBufferFromNeighbor, MessageInfo messageInfoFromNeighbor) {
    byteBufferFromNeighbor.position(0);
    byteBufferFromNeighbor.limit(messageInfoFromNeighbor.bytes());
    byte[] bufArr = new byte[byteBufferFromNeighbor.remaining()];
    byteBufferFromNeighbor.get(bufArr);/*from   w  ww  .ja va2  s  .  co m*/
    return new String(bufArr);
}

From source file:com.glaf.core.util.ByteBufferUtils.java

public static void readFrom(InputStream is, int needed, ByteBuffer buffer) throws IOException {
    ByteBuffer tmp = allocate(8192);
    while (needed > 0 && buffer.hasRemaining()) {
        int l = is.read(tmp.array(), 0, 8192);
        if (l < 0) {
            break;
        }/*from   ww  w  . j  a  v  a2 s  . co m*/
        tmp.position(0);
        tmp.limit(l);
        buffer.put(tmp);
    }
}

From source file:com.healthmarketscience.jackcess.impl.OleUtil.java

private static String readStr(ByteBuffer bb, int off, int len, Charset charset) {
    String str = new String(bb.array(), off, len, charset);
    bb.position(off + len);
    if (str.charAt(str.length() - 1) == '\0') {
        str = str.substring(0, str.length() - 1);
    }//from  ww  w  .ja v  a  2  s  . co m
    return str;
}

From source file:io.github.dsheirer.record.wave.WaveWriter.java

/**
 * Creates a little-endian 4-byte buffer containing an unsigned 32-bit
 * integer value derived from the 4 least significant bytes of the argument.
 *
 * The buffer's position is set to 0 to prepare it for writing to a channel.
 *//*  w  ww.  jav a 2 s. c o  m*/
protected static ByteBuffer getUnsignedIntegerBuffer(long size) {
    ByteBuffer buffer = ByteBuffer.allocate(4);

    buffer.put((byte) (size & 0xFFl));
    buffer.put((byte) (Long.rotateRight(size & 0xFF00l, 8)));
    buffer.put((byte) (Long.rotateRight(size & 0xFF0000l, 16)));

    /* This side-steps an issue with right shifting a signed long by 32
     * where it produces an error value.  Instead, we right shift in two steps. */
    buffer.put((byte) Long.rotateRight(Long.rotateRight(size & 0xFF000000l, 16), 8));

    buffer.position(0);

    return buffer;
}