org.apache.lucene.search.grouping

Class AllGroupsCollector<T>

java.lang.Object

org.apache.lucene.search.SimpleCollector

org.apache.lucene.search.grouping.AllGroupsCollector<T>

All Implemented Interfaces:

Collector, LeafCollector

public class AllGroupsCollector<T>
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.

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

Constructor Summary

Constructors

Constructor and Description
AllGroupsCollector(GroupSelector<T> groupSelector) Create a new AllGroupsCollector

Method Summary

Modifier and Type	Method and Description
void	collect(int doc)
protected void	doSetNextReader(LeafReaderContext context)
int	getGroupCount() Returns the total number of groups for the executed search.
Collection<T>	getGroups() Returns the group values
boolean	needsScores()
void	setScorer(Scorer scorer)

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

getLeafCollector

Methods inherited from class java.lang.Object

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

Constructor Detail

AllGroupsCollector

public AllGroupsCollector(GroupSelector<T> groupSelector)

Create a new AllGroupsCollector

Parameters:

groupSelector - the GroupSelector to determine groups

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 Collection<T> getGroups()

Returns the group values

This is an unordered collections of group values.

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

doSetNextReader

protected void doSetNextReader(LeafReaderContext context)
                        throws IOException

Overrides:

doSetNextReader in class SimpleCollector

Throws:

IOException

collect

public void collect(int doc)
             throws IOException

Specified by:

collect in interface LeafCollector

Specified by:

collect in class SimpleCollector

Throws:

IOException

needsScores

public boolean needsScores()