Class AbstractAllGroupsCollector<TGroupValue>

A collector that collects all groups that match the query. Only the group value is collected, and the order is undefined. This collector does not determine the most relevant document of a group.

This is an abstract version. Concrete implementations define what a group actually is and how it is internally collected.

Note

This API is experimental and might change in incompatible ways in the next release.

Inheritance
System.Object
AbstractAllGroupsCollector<TGroupValue>
FunctionAllGroupsCollector<TMutableValue>
TermAllGroupsCollector
Implements
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
Assembly: Lucene.Net.Grouping.dll
Syntax
public abstract class AbstractAllGroupsCollector<TGroupValue> : IAbstractAllGroupsCollector<TGroupValue>, ICollector
Type Parameters
Name Description
TGroupValue

Properties

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AcceptsDocsOutOfOrder

Declaration
public virtual bool AcceptsDocsOutOfOrder { get; }
Property Value
Type Description
System.Boolean
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GroupCount

Returns the total number of groups for the executed search. This is a convenience method. The following code snippet has the same effect: 

GetGroups().Count

Declaration
public virtual int GroupCount { get; }
Property Value
Type Description
System.Int32

The total number of groups for the executed search
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Groups

Returns the group values

This is an unordered collections of group values. For each group that matched the query there is a Lucene.Net.Util.BytesRef representing a group value.

Declaration
public abstract IEnumerable<TGroupValue> Groups { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<TGroupValue>

the group values

Methods

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Collect(Int32)

Called once for every document matching a query, with the unbased document number.

Note: The collection of the current segment can be terminated by throwing a Lucene.Net.Search.CollectionTerminatedException. In this case, the last docs of the current Lucene.Net.Index.AtomicReaderContext will be skipped and Lucene.Net.Search.IndexSearcher will swallow the exception and continue collection with the next leaf.

Note: this is called in an inner search loop. For good search performance, implementations of this method should not call Doc(Int32) or Document(Int32) on every hit. Doing so can slow searches by an order of magnitude or more.

Declaration
public abstract void Collect(int doc)
Parameters
Type Name Description
System.Int32 doc
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SetNextReader(AtomicReaderContext)

Called before collecting from each Lucene.Net.Index.AtomicReaderContext. All doc ids in Collect(Int32) will correspond to Lucene.Net.Index.IndexReaderContext.Reader.

Add DocBase to the current Lucene.Net.Index.IndexReaderContext.Reader's internal document id to re-base ids in Collect(Int32).

Declaration
public abstract void SetNextReader(AtomicReaderContext context)
Parameters
Type Name Description
Lucene.Net.Index.AtomicReaderContext context

next atomic reader context

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SetScorer(Scorer)

Declaration
public virtual void SetScorer(Scorer scorer)
Parameters
Type Name Description
Lucene.Net.Search.Scorer scorer

Implements

Lucene.Net.Search.ICollector