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Fix bitCount is 0 after intersect or union #40

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Fix bitCount is 0 after intersect or union #40

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7a1b3f9
Fix bitCount is 0 after intersect or union
SidWeng Aug 29, 2018
a5c4ab9
wrong approximateElementCount() after union/intersection
SidWeng Sep 3, 2018
290d68f
remove unnecessary code
SidWeng Sep 3, 2018
730fef7
remove unused import
SidWeng Sep 3, 2018
8c38b47
Revert "remove unused import"
SidWeng Sep 4, 2018
cb3c432
Revert "remove unnecessary code"
SidWeng Sep 4, 2018
360eda2
stupid error, forget to use the right function
SidWeng Sep 4, 2018
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18 changes: 18 additions & 0 deletions bloom-filter/src/main/scala/bloomfilter/mutable/UnsafeBitArray.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@ package bloomfilter.mutable
import java.io._

import bloomfilter.util.Unsafe.unsafe
import scala.annotation.tailrec

@SerialVersionUID(2L)
class UnsafeBitArray(val numberOfBits: Long) extends Serializable {
Expand Down Expand Up @@ -33,6 +34,7 @@ class UnsafeBitArray(val numberOfBits: Long) extends Serializable {
val thatLong = unsafe.getLong(that.ptr + (index >>> 6) * 8L)
val longAtIndex = combiner(thisLong, thatLong)
unsafe.putLong(result.ptr + (index >>> 6) * 8L, longAtIndex)
result.addBitCount(UnsafeBitArray.getSetBit(longAtIndex))
index += 64
}
result
Expand All @@ -50,6 +52,10 @@ class UnsafeBitArray(val numberOfBits: Long) extends Serializable {
combine(that, _ & _)
}

def addBitCount(i: Long): Unit = {
bitCount += i
}

def getBitCount: Long = {
bitCount
}
Expand Down Expand Up @@ -102,4 +108,16 @@ object UnsafeBitArray {
private def readResolve: AnyRef = unsafeBitArray
}

def getSetBit(i: Long): Long = {
@tailrec
def aux(i: Long, cnt: Long): Long = {
if (i == 0) {
cnt
} else {
aux(i & (i -1), cnt + 1)
}
}

aux(i, 0)
}
}