Class Packed64

Space optimized random access capable array of values with a fixed number of bits/value. Values are packed contiguously.

The implementation strives to perform af fast as possible under the constraint of contiguous bits, by avoiding expensive operations. This comes at the cost of code clarity.

Technical details: this implementation is a refinement of a non-branching version. The non-branching get and set methods meant that 2 or 4 atomics in the underlying array were always accessed, even for the cases where only 1 or 2 were needed. Even with caching, this had a detrimental effect on performance. Related to this issue, the old implementation used lookup tables for shifts and masks, which also proved to be a bit slower than calculating the shifts and masks on the fly. See https://issues.apache.org/jira/browse/LUCENE-4062 for details.

Inheritance
System.Object
NumericDocValues
PackedInt32s.Reader
PackedInt32s.Mutable
PackedInt32s.MutableImpl
Packed64
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)
Namespace: Lucene.Net.Util.Packed
Assembly: Lucene.Net.dll
Syntax
public class Packed64 : PackedInt32s.MutableImpl

Constructors

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Packed64(Int32, DataInput, Int32, Int32)

Creates an array with content retrieved from the given DataInput.

Declaration
public Packed64(int packedIntsVersion, DataInput in, int valueCount, int bitsPerValue)
Parameters
Type Name Description
System.Int32 packedIntsVersion
DataInput in

A DataInput, positioned at the start of Packed64-content.

System.Int32 valueCount

The number of elements.

System.Int32 bitsPerValue

The number of bits available for any given value.

Exceptions
Type Condition
System.IO.IOException

If the values for the backing array could not be retrieved.

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Packed64(Int32, Int32)

Creates an array with the internal structures adjusted for the given limits and initialized to 0.

Declaration
public Packed64(int valueCount, int bitsPerValue)
Parameters
Type Name Description
System.Int32 valueCount

The number of elements.

System.Int32 bitsPerValue

The number of bits available for any given value.

Methods

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Clear()

Declaration
public override void Clear()
Overrides
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Fill(Int32, Int32, Int64)

Declaration
public override void Fill(int fromIndex, int toIndex, long val)
Parameters
Type Name Description
System.Int32 fromIndex
System.Int32 toIndex
System.Int64 val
Overrides
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Get(Int32)

Declaration
public override long Get(int index)
Parameters
Type Name Description
System.Int32 index

The position of the value.

Returns
Type Description
System.Int64

The value at the given index.

Overrides
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Get(Int32, Int64[], Int32, Int32)

Declaration
public override int Get(int index, long[] arr, int off, int len)
Parameters
Type Name Description
System.Int32 index
System.Int64[] arr
System.Int32 off
System.Int32 len
Returns
Type Description
System.Int32
Overrides
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RamBytesUsed()

Declaration
public override long RamBytesUsed()
Returns
Type Description
System.Int64
Overrides
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Set(Int32, Int64)

Declaration
public override void Set(int index, long value)
Parameters
Type Name Description
System.Int32 index
System.Int64 value
Overrides
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Set(Int32, Int64[], Int32, Int32)

Declaration
public override int Set(int index, long[] arr, int off, int len)
Parameters
Type Name Description
System.Int32 index
System.Int64[] arr
System.Int32 off
System.Int32 len
Returns
Type Description
System.Int32
Overrides
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ToString()

Declaration
public override string ToString()
Returns
Type Description
System.String
Overrides
System.Object.ToString()