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Deduplicate looking for bitset.nextSetBit() in BitSetIterator.next() and hasNext() #37

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Deduplicate looking for bitset.nextSetBit() in BitSetIterator.next() and hasNext() #37

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18 changes: 14 additions & 4 deletions src/main/java/com/metamx/collections/bitmap/WrappedImmutableBitSetBitmap.java
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@

import java.nio.ByteBuffer;
import java.util.BitSet;
import java.util.NoSuchElementException;

/**
* WrappedImmutableBitSetBitmap implements ImmutableBitmap for java.util.BitSet
Expand Down Expand Up @@ -47,26 +48,35 @@ public WrappedImmutableBitSetBitmap(ByteBuffer byteBuffer){

private class BitSetIterator implements IntIterator
{
private int pos = -1;
private int nextPos;

BitSetIterator()
{
nextPos = bitmap.nextSetBit(0);
}

@Override
public boolean hasNext()
{
return bitmap.nextSetBit(pos + 1) >= 0;
return nextPos >= 0;
}

@Override
public int next()
{
pos = bitmap.nextSetBit(pos + 1);
int pos = nextPos;
if (pos < 0) {
throw new NoSuchElementException();
}
nextPos = bitmap.nextSetBit(pos + 1);
return pos;
}

@Override
public IntIterator clone()
{
BitSetIterator newIt = new BitSetIterator();
newIt.pos = pos;
newIt.nextPos = nextPos;
return newIt;
}
}
Expand Down