Package org.elasticsearch.search.aggregations

Class MultiBucketCollector

java.lang.Object

org.elasticsearch.search.aggregations.BucketCollector

org.elasticsearch.search.aggregations.MultiBucketCollector

All Implemented Interfaces:

org.apache.lucene.search.Collector

public class MultiBucketCollector
extends BucketCollector

A BucketCollector which allows running a bucket collection with several BucketCollectors. It is similar to the MultiCollector except that the wrap(org.elasticsearch.search.aggregations.BucketCollector...) method filters out the BucketCollector.NO_OP_COLLECTORs and not the null ones.

Field Summary

Fields inherited from class org.elasticsearch.search.aggregations.BucketCollector

NO_OP_COLLECTOR

Method Summary

Modifier and Type	Method	Description
LeafBucketCollector	getLeafCollector(org.apache.lucene.index.LeafReaderContext context)
boolean	needsScores()
void	postCollection()	Post-collection callback.
void	preCollection()	Pre collection callback.
java.lang.String	toString()
static BucketCollector	wrap(java.lang.Iterable<? extends BucketCollector> collectors)	Wraps a list of BucketCollectors with a MultiBucketCollector.
static BucketCollector	wrap(BucketCollector... collectors)	See wrap(Iterable).

Methods inherited from class java.lang.Object

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

Method Detail

wrap

public static BucketCollector wrap(BucketCollector... collectors)

See wrap(Iterable).

wrap

public static BucketCollector wrap(java.lang.Iterable<? extends BucketCollector> collectors)

Wraps a list of BucketCollectors with a MultiBucketCollector. This method works as follows:

• Filters out the BucketCollector.NO_OP_COLLECTORs collectors, so they are not used during search time.
• If the input contains 1 real collector, it is returned.
• Otherwise the method returns a MultiBucketCollector which wraps the non-BucketCollector.NO_OP_COLLECTOR collectors.

preCollection

public void preCollection()
                   throws java.io.IOException

Description copied from class: BucketCollector

Pre collection callback.

Specified by:

preCollection in class BucketCollector

Throws:

java.io.IOException

postCollection

public void postCollection()
                    throws java.io.IOException

Description copied from class: BucketCollector

Post-collection callback.

Specified by:

postCollection in class BucketCollector

Throws:

java.io.IOException

needsScores

public boolean needsScores()

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getLeafCollector

public LeafBucketCollector getLeafCollector(org.apache.lucene.index.LeafReaderContext context)
                                     throws java.io.IOException

Specified by:

getLeafCollector in interface org.apache.lucene.search.Collector

Specified by:

getLeafCollector in class BucketCollector

Throws:

java.io.IOException