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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| namespace Bloomn | ||
| { | ||
| public static class BloomFilter | ||
| { | ||
| public static IBloomFilterBuilder<TKey> Builder<TKey>() => new BloomFilterBuilder<TKey>(new BloomFilterOptions<TKey>()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| using System; | ||
| using System.Diagnostics.CodeAnalysis; | ||
|
|
||
| namespace Bloomn | ||
| { | ||
| public class BloomFilterDimensionsBuilder | ||
| { | ||
| public double? FalsePositiveProbability { get; set; } | ||
| public int? Capacity { get; set; } | ||
| public int? BitCount { get; set; } | ||
| public int? HashCount { get; set; } | ||
|
|
||
| [MemberNotNullWhen(true, nameof(FalsePositiveProbability))] | ||
| [MemberNotNullWhen(true, nameof(Capacity))] | ||
| [MemberNotNullWhen(true, nameof(BitCount))] | ||
| [MemberNotNullWhen(true, nameof(HashCount))] | ||
| public bool FullySpecified => FalsePositiveProbability != null && Capacity != null && BitCount != null && HashCount != null; | ||
|
|
||
| public bool Buildable => | ||
| Capacity.HasValue && FalsePositiveProbability.HasValue | ||
| || FalsePositiveProbability.HasValue && BitCount.HasValue | ||
| || Capacity.HasValue && FalsePositiveProbability.HasValue | ||
| || Capacity.HasValue && BitCount.HasValue | ||
| || FalsePositiveProbability.HasValue && BitCount.HasValue; | ||
|
|
||
| public BloomFilterDimensions Build() | ||
| { | ||
| // Create a copy to mutate during building | ||
| return new BloomFilterDimensionsBuilder() | ||
| { | ||
| FalsePositiveProbability = this.FalsePositiveProbability, | ||
| Capacity = this.Capacity, | ||
| BitCount = this.BitCount, | ||
| HashCount = this.HashCount | ||
| }.ReallyBuild(); | ||
| } | ||
|
|
||
| private BloomFilterDimensions ReallyBuild() | ||
| { | ||
| if (!Buildable) | ||
| { | ||
| throw new InvalidOperationException("Not enough parameters are set."); | ||
| } | ||
|
|
||
| var makingProgress = true; | ||
| while (!FullySpecified && makingProgress) | ||
| { | ||
| makingProgress = false; | ||
| if (!HashCount.HasValue && Capacity.HasValue && BitCount.HasValue) | ||
| { | ||
| HashCount = BloomFilterDimensions.Equations.k(BitCount.Value, Capacity.Value); | ||
| makingProgress = true; | ||
| continue; | ||
| } | ||
|
|
||
| if (!HashCount.HasValue && FalsePositiveProbability.HasValue) | ||
| { | ||
| HashCount = BloomFilterDimensions.Equations.k(FalsePositiveProbability.Value); | ||
| makingProgress = true; | ||
| continue; | ||
| } | ||
|
|
||
| if (!BitCount.HasValue && Capacity.HasValue && FalsePositiveProbability.HasValue) | ||
| { | ||
| BitCount = BloomFilterDimensions.Equations.m(Capacity.Value, FalsePositiveProbability.Value); | ||
| makingProgress = true; | ||
| continue; | ||
| } | ||
|
|
||
| if (!Capacity.HasValue && BitCount.HasValue && HashCount.HasValue && FalsePositiveProbability.HasValue) | ||
| { | ||
| Capacity = BloomFilterDimensions.Equations.n(BitCount.Value, HashCount.Value, FalsePositiveProbability.Value); | ||
| makingProgress = true; | ||
| continue; | ||
| } | ||
|
|
||
| if (!FalsePositiveProbability.HasValue && BitCount.HasValue && Capacity.HasValue && HashCount.HasValue) | ||
| { | ||
| FalsePositiveProbability = BloomFilterDimensions.Equations.p(BitCount.Value, Capacity.Value, HashCount.Value); | ||
| makingProgress = true; | ||
| } | ||
| } | ||
|
|
||
| if (!FullySpecified) | ||
| { | ||
| throw new InvalidOperationException($"Could not compute dimensions using provided values: {this}"); | ||
| } | ||
|
|
||
| return new BloomFilterDimensions(FalsePositiveProbability.Value, Capacity.Value, BitCount.Value, HashCount.Value); | ||
| } | ||
|
|
||
| public override string ToString() | ||
| { | ||
| return $"{nameof(FalsePositiveProbability)}: {FalsePositiveProbability}, {nameof(Capacity)}: {Capacity}, {nameof(BitCount)}: {BitCount}, {nameof(HashCount)}: {HashCount}"; | ||
| } | ||
| } | ||
| } |
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