Class MonotonicBlockPackedWriter

A writer for large monotonically increasing sequences of positive System.Int64s.

The sequence is divided into fixed-size blocks and for each block, values are modeled after a linear function f: x → A × x + B. The block encodes deltas from the expected values computed from this function using as few bits as possible. Each block has an overhead between 6 and 14 bytes.

Format:

  • <BLock>BlockCount
  • BlockCount: ⌈ ValueCount / BlockSize ⌉
  • Block: <Header, (Ints)>
  • Header: <B, A, BitsPerValue>
  • B: the B from f: x → A × x + B using a variable-length System.Int64 (WriteVInt64(Int64))
  • A: the A from f: x → A × x + B encoded using J2N.BitConversion.SingleToInt32Bits(System.Single) on 4 bytes (WriteVInt32(Int32))
  • BitsPerValue: a variable-length System.Int32 (WriteVInt32(Int32))
  • Ints: if BitsPerValue is 0, then there is nothing to read and all values perfectly match the result of the function. Otherwise, these are the zigzag-encoded packed (PackedInt32s) deltas from the expected value (computed from the function) using exaclty BitsPerValue bits per value

This is a Lucene.NET INTERNAL API, use at your own risk
Inheritance
System.Object
AbstractBlockPackedWriter
MonotonicBlockPackedWriter
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Util.Packed
Assembly: Lucene.Net.dll
Syntax
public sealed class MonotonicBlockPackedWriter : AbstractBlockPackedWriter

Constructors

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MonotonicBlockPackedWriter(DataOutput, Int32)

Sole constructor.

Declaration
public MonotonicBlockPackedWriter(DataOutput out, int blockSize)
Parameters
Type Name Description
DataOutput out
System.Int32 blockSize

The number of values of a single block, must be a power of 2.

Methods

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Add(Int64)

Declaration
public override void Add(long l)
Parameters
Type Name Description
System.Int64 l
Overrides
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Flush()

Declaration
protected override void Flush()
Overrides

See Also