Class FunctionFirstPassGroupingCollector

Concrete implementation of AbstractFirstPassGroupingCollector<TGroupValue> that groups based on Lucene.Net.Queries.Function.ValueSource instances.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
AbstractFirstPassGroupingCollector<Lucene.Net.Util.Mutable.MutableValue>
FunctionFirstPassGroupingCollector
Implements
IAbstractFirstPassGroupingCollector<Lucene.Net.Util.Mutable.MutableValue>
Lucene.Net.Search.ICollector
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Search.Grouping.Function
Assembly: Lucene.Net.Grouping.dll
Syntax
public class FunctionFirstPassGroupingCollector : AbstractFirstPassGroupingCollector<MutableValue>, IAbstractFirstPassGroupingCollector<MutableValue>, ICollector

Constructors

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FunctionFirstPassGroupingCollector(ValueSource, IDictionary, Sort, Int32)

Creates a first pass collector.

Declaration
public FunctionFirstPassGroupingCollector(ValueSource groupByVS, IDictionary vsContext, Sort groupSort, int topNGroups)
Parameters
Type Name Description
Lucene.Net.Queries.Function.ValueSource groupByVS

The Lucene.Net.Queries.Function.ValueSource instance to group by
System.Collections.IDictionary vsContext

The Lucene.Net.Queries.Function.ValueSource context
Lucene.Net.Search.Sort groupSort

The Lucene.Net.Search.Sort used to sort the groups. The top sorted document within each group according to groupSort, determines how that group sorts against other groups. This must be non-null, ie, if you want to groupSort by relevance use RELEVANCE.
System.Int32 topNGroups

How many top groups to keep.
Exceptions
Type Condition
System.IO.IOException

When I/O related errors occur

Methods

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CopyDocGroupValue(MutableValue, MutableValue)

Declaration
protected override MutableValue CopyDocGroupValue(MutableValue groupValue, MutableValue reuse)
Parameters
Type Name Description
Lucene.Net.Util.Mutable.MutableValue groupValue
Lucene.Net.Util.Mutable.MutableValue reuse
Returns
Type Description
Lucene.Net.Util.Mutable.MutableValue
Overrides
Lucene.Net.Search.Grouping.AbstractFirstPassGroupingCollector<Lucene.Net.Util.Mutable.MutableValue>.CopyDocGroupValue(Lucene.Net.Util.Mutable.MutableValue, Lucene.Net.Util.Mutable.MutableValue)
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GetDocGroupValue(Int32)

Declaration
protected override MutableValue GetDocGroupValue(int doc)
Parameters
Type Name Description
System.Int32 doc
Returns
Type Description
Lucene.Net.Util.Mutable.MutableValue
Overrides
Lucene.Net.Search.Grouping.AbstractFirstPassGroupingCollector<Lucene.Net.Util.Mutable.MutableValue>.GetDocGroupValue(System.Int32)
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SetNextReader(AtomicReaderContext)

Declaration
public override void SetNextReader(AtomicReaderContext context)
Parameters
Type Name Description
Lucene.Net.Index.AtomicReaderContext context
Overrides
Lucene.Net.Search.Grouping.AbstractFirstPassGroupingCollector<Lucene.Net.Util.Mutable.MutableValue>.SetNextReader(Lucene.Net.Index.AtomicReaderContext)

Implements

Lucene.Net.Search.ICollector