/// <summary>
/// Encodes and compresses this container.
/// </summary>
/// <returns> The buffer. </returns>
/// <exception cref="IOException"> if an I/O error occurs. </exception>
public ByteBuffer Encode()
{
var data = GetData(); // so we have a read only view, making this method thread safe
/* grab the data as a byte array for compression */
var bytes = new byte[data.limit()];
data.mark();
data.get(bytes);
data.reset();
/* compress the data */
byte[] compressed;
if (type == COMPRESSION_NONE)
{
compressed = bytes;
}
else if (type == COMPRESSION_GZIP)
{
compressed = CompressionUtils.Gzip(bytes);
}
else if (type == COMPRESSION_BZIP2)
{
compressed = CompressionUtils.Bzip2(bytes);
}
else
{
throw new IOException("Invalid compression type");
}
/* calculate the size of the header and trailer and allocate a buffer */
var header = 5 + (type == COMPRESSION_NONE ? 0 : 4) + (IsVersioned() ? 2 : 0);
var buf = ByteBuffer.allocate(header + compressed.Length);
/* write the header, with the optional uncompressed length */
buf.put((byte)type);
buf.putInt(compressed.Length);
if (type != COMPRESSION_NONE)
{
buf.putInt(data.limit());
}
/* write the compressed length */
buf.put(compressed);
/* write the trailer with the optional version */
if (IsVersioned())
{
buf.putShort((short)version);
}
/* flip the buffer and return it */
return((ByteBuffer)buf.flip());
}
