org.apache.lucene.search.grouping

Class AbstractAllGroupsCollector<GROUP_VALUE_TYPE>

java.lang.Object

org.apache.lucene.search.SimpleCollector

org.apache.lucene.search.grouping.AbstractAllGroupsCollector<GROUP_VALUE_TYPE>

All Implemented Interfaces:

Collector, LeafCollector

Direct Known Subclasses:

FunctionAllGroupsCollector, TermAllGroupsCollector

public abstract class AbstractAllGroupsCollector<GROUP_VALUE_TYPE>
extends SimpleCollector

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.

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

Constructor Summary

Constructors

Constructor and Description
AbstractAllGroupsCollector()

Method Summary

Methods

Modifier and Type	Method and Description
int	getGroupCount() Returns the total number of groups for the executed search.
abstract Collection<GROUP_VALUE_TYPE>	getGroups() Returns the group values
void	setScorer(Scorer scorer)

Methods inherited from class org.apache.lucene.search.SimpleCollector

collect, doSetNextReader, getLeafCollector

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.lucene.search.Collector

needsScores

Constructor Detail

AbstractAllGroupsCollector

public AbstractAllGroupsCollector()

Method Detail

getGroupCount

public int getGroupCount()

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

getGroups().size()

Returns:

The total number of groups for the executed search

getGroups

public abstract Collection<GROUP_VALUE_TYPE> getGroups()

Returns the group values

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

Returns:

the group values

setScorer

public void setScorer(Scorer scorer)
               throws IOException

Specified by:

setScorer in interface LeafCollector

Overrides:

setScorer in class SimpleCollector

Throws:

IOException