Class EliasFanoDecoder

A decoder for an EliasFanoEncoder.

This is a Lucene.NET INTERNAL API, use at your own risk
Inheritance
System.Object
EliasFanoDecoder
Namespace: Lucene.Net.Util.Packed
Assembly: Lucene.Net.dll
Syntax
public class EliasFanoDecoder : object

Constructors

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EliasFanoDecoder(EliasFanoEncoder)

Construct a decoder for a given EliasFanoEncoder. The decoding index is set to just before the first encoded value.

Declaration
public EliasFanoDecoder(EliasFanoEncoder efEncoder)
Parameters
Type Name Description
EliasFanoEncoder efEncoder

Fields

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NO_MORE_VALUES

Declaration
public const long NO_MORE_VALUES = null
Field Value
Type Description
System.Int64

Properties

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EliasFanoEncoder

Declaration
public virtual EliasFanoEncoder EliasFanoEncoder { get; }
Property Value
Type Description
EliasFanoEncoder

The Elias-Fano encoder that is decoded.

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NumEncoded

The number of values encoded by the encoder.

Declaration
public virtual long NumEncoded { get; }
Property Value
Type Description
System.Int64

The number of values encoded by the encoder.

Methods

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AdvanceToIndex(Int64)

Advance the decoding index to a given index. and return true iff it is available.

See also CurrentValue().

The current implementation does not use the index on the upper bit zero bit positions.

Note: there is currently no implementation of BackToIndex().

Declaration
public virtual bool AdvanceToIndex(long index)
Parameters
Type Name Description
System.Int64 index
Returns
Type Description
System.Boolean
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AdvanceToValue(Int64)

Given a target value, advance the decoding index to the first bigger or equal value and return it if it is available. Otherwise return NO_MORE_VALUES.

The current implementation uses the index on the upper zero bit positions.

Declaration
public virtual long AdvanceToValue(long target)
Parameters
Type Name Description
System.Int64 target
Returns
Type Description
System.Int64
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BackToValue(Int64)

Given a target value, go back to the first smaller or equal value and return it if it is available. Otherwise return NO_MORE_VALUES.

The current implementation does not use the index on the upper zero bit positions.

Declaration
public virtual long BackToValue(long target)
Parameters
Type Name Description
System.Int64 target
Returns
Type Description
System.Int64
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CurrentIndex()

The current decoding index. The first value encoded by EncodeNext(Int64) has index 0. Only valid directly after NextValue(), AdvanceToValue(Int64), PreviousValue(), or BackToValue(Int64) returned another value than NO_MORE_VALUES, or AdvanceToIndex(Int64) returned true.

Declaration
public virtual long CurrentIndex()
Returns
Type Description
System.Int64

The decoding index of the last decoded value, or as last set by AdvanceToIndex(Int64).

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CurrentValue()

The value at the current decoding index. Only valid when CurrentIndex() would return a valid result.

This is only intended for use after AdvanceToIndex(Int64) returned true.

Declaration
public virtual long CurrentValue()
Returns
Type Description
System.Int64

The value encoded at CurrentIndex().

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NextValue()

If another value is available after the current decoding index, return this value and and increase the decoding index by 1. Otherwise return NO_MORE_VALUES.

Declaration
public virtual long NextValue()
Returns
Type Description
System.Int64
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PreviousValue()

If another value is available before the current decoding index, return this value and decrease the decoding index by 1. Otherwise return NO_MORE_VALUES.

Declaration
public virtual long PreviousValue()
Returns
Type Description
System.Int64
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ToAfterSequence()

Set the decoding index to just after the last encoded value.

Declaration
public virtual void ToAfterSequence()
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ToBeforeSequence()

Set the decoding index to just before the first encoded value.

Declaration
public virtual void ToBeforeSequence()