/// <summary>
/// Serializes the data set to file using the following format:
/// <list type="bullet">
/// <item><description>FuzzySet -->FuzzySetVersion,HashFunctionName,BloomSize,
/// NumBitSetWords,BitSetWord<sup>NumBitSetWords</sup></description></item>
/// <item><description>HashFunctionName --> String (<see cref="DataOutput.WriteString(string)"/>) The
/// name of a ServiceProvider registered <see cref="HashFunction"/></description></item>
/// <item><description>FuzzySetVersion --> Uint32 (<see cref="DataOutput.WriteInt32(int)"/>) The version number of the <see cref="FuzzySet"/> class</description></item>
/// <item><description>BloomSize --> Uint32 (<see cref="DataOutput.WriteInt32(int)"/>) The modulo value used
/// to project hashes into the field's Bitset</description></item>
/// <item><description>NumBitSetWords --> Uint32 (<see cref="DataOutput.WriteInt32(int)"/>) The number of
/// longs (as returned from <see cref="FixedBitSet.GetBits()"/>)</description></item>
/// <item><description>BitSetWord --> Long (<see cref="DataOutput.WriteInt64(long)"/>) A long from the array
/// returned by <see cref="FixedBitSet.GetBits()"/></description></item>
/// </list>
/// </summary>
/// <param name="output">Data output stream.</param>
/// <exception cref="System.IO.IOException">If there is a low-level I/O error.</exception>
public virtual void Serialize(DataOutput output)
{
output.WriteInt32(VERSION_CURRENT);
output.WriteInt32(_bloomSize);
var bits = _filter.GetBits();
output.WriteInt32(bits.Length);
foreach (var t in bits)
{
// Can't used VLong encoding because cant cope with negative numbers
// output by FixedBitSet
output.WriteInt64(t);
}
}
public long RamBytesUsed()
{
return(RamUsageEstimator.SizeOf(_filter.GetBits()));
}