Class OpenBitSetIterator

An iterator to iterate over set bits in an OpenBitSet. this is faster than NextSetBit(long) for iterating over the complete set of bits, especially when the density of the bits set is high.

Inheritance
object
DocIdSetIterator
OpenBitSetIterator
Inherited Members
Namespace: Lucene.Net.Util
Assembly: Lucene.Net.dll
Syntax
public class OpenBitSetIterator : DocIdSetIterator

Constructors

OpenBitSetIterator(OpenBitSet)

An iterator to iterate over set bits in an OpenBitSet. this is faster than NextSetBit(long) for iterating over the complete set of bits, especially when the density of the bits set is high.

Declaration
public OpenBitSetIterator(OpenBitSet obs)
Parameters
Type Name Description
OpenBitSet obs

OpenBitSetIterator(long[], int)

An iterator to iterate over set bits in an OpenBitSet. this is faster than NextSetBit(long) for iterating over the complete set of bits, especially when the density of the bits set is high.

Declaration
public OpenBitSetIterator(long[] bits, int numWords)
Parameters
Type Name Description
long[] bits
int numWords

Properties

DocID

Returns the following:

@since 2.9

Declaration
public override int DocID { get; }
Property Value
Type Description
int
Overrides

Methods

Advance(int)

Advances to the first beyond the current whose document number is greater than or equal to target, and returns the document number itself. Exhausts the iterator and returns NO_MORE_DOCS if target is greater than the highest document number in the set.

The behavior of this method is undefined when called with target <= current, or after the iterator has exhausted. Both cases may result in unpredicted behavior.

When target > current it behaves as if written: 
int Advance(int target) 
{
    int doc;
    while ((doc = NextDoc()) < target) 
    {
    }
    return doc;
}

Some implementations are considerably more efficient than that.

NOTE: this method may be called with NO_MORE_DOCS for efficiency by some Scorers. If your implementation cannot efficiently determine that it should exhaust, it is recommended that you check for that value in each call to this method.

@since 2.9

Declaration
public override int Advance(int target)
Parameters
Type Name Description
int target
Returns
Type Description
int
Overrides

GetCost()

Returns the estimated cost of this DocIdSetIterator.

This is generally an upper bound of the number of documents this iterator might match, but may be a rough heuristic, hardcoded value, or otherwise completely inaccurate.
Declaration
public override long GetCost()
Returns
Type Description
long
Overrides

NextDoc()

Advances to the next document in the set and returns the doc it is currently on, or NO_MORE_DOCS if there are no more docs in the set.

NOTE: after the iterator has exhausted you should not call this method, as it may result in unpredicted behavior.

@since 2.9
Declaration
public override int NextDoc()
Returns
Type Description
int
Overrides