Class ToParentBlockJoinFieldComparer.Lowest

Concrete implementation of ToParentBlockJoinSortField to sorts the parent docs with the lowest values in the child / nested docs first.

Inheritance
object
FieldComparer
FieldComparer<object>
ToParentBlockJoinFieldComparer
ToParentBlockJoinFieldComparer.Lowest
Inherited Members
FieldComparer<object>.SetTopValue<TValue>(TValue)
FieldComparer<object>.CompareValues(object, object)
FieldComparer.SetScorer(Scorer)
Namespace: Lucene.Net.Search.Join
Assembly: Lucene.Net.Join.dll
Syntax
public sealed class ToParentBlockJoinFieldComparer.Lowest : ToParentBlockJoinFieldComparer

Constructors

Lowest(FieldComparer, Filter, Filter, int)

Create ToParentBlockJoinFieldComparer.Lowest

Declaration
public Lowest(FieldComparer wrappedComparer, Filter parentFilter, Filter childFilter, int spareSlot)
Parameters
Type Name Description
FieldComparer wrappedComparer

The Lucene.Net.Search.FieldComparer on the child / nested level.
Filter parentFilter

Lucene.Net.Search.Filter (must produce Lucene.Net.Util.FixedBitSet per-segment) that identifies the parent documents.
Filter childFilter

Lucene.Net.Search.Filter that defines which child / nested documents participates in sorting.
int spareSlot

The extra slot inside the wrapped comparer that is used to compare which nested document inside the parent document scope is most competitive.

Methods

CompareBottom(int)

Compare the bottom of the queue with this doc. This will only invoked after SetBottom(int) has been called. This should return the same result as Compare(int, int) as if bottom were slot1 and the new document were slot 2.

For a search that hits many results, this method will be the hotspot (invoked by far the most frequently).

Declaration
public override int CompareBottom(int parentDoc)
Parameters
Type Name Description
int parentDoc
Returns
Type Description
int

Any N < 0 if the doc's value is sorted after the bottom entry (not competitive), any N > 0 if the doc's value is sorted before the bottom entry and 0 if they are equal.
Overrides

CompareTop(int)

Compare the top value with this doc. This will only invoked after Lucene.Net.Search.FieldComparer<T>.SetTopValue(T) has been called. This should return the same result as Compare(int, int) as if topValue were slot1 and the new document were slot 2. This is only called for searches that use SearchAfter (deep paging).

Declaration
public override int CompareTop(int parentDoc)
Parameters
Type Name Description
int parentDoc
Returns
Type Description
int

Any N < 0 if the doc's value is sorted after the bottom entry (not competitive), any N > 0 if the doc's value is sorted before the bottom entry and 0 if they are equal.
Overrides

Copy(int, int)

This method is called when a new hit is competitive. You should copy any state associated with this document that will be required for future comparisons, into the specified slot.

Declaration
public override void Copy(int slot, int parentDoc)
Parameters
Type Name Description
int slot

Which slot to copy the hit to
int parentDoc
Overrides