Package org.elasticsearch.search.aggregations

Class InternalAggregation

java.lang.Object

org.elasticsearch.search.aggregations.InternalAggregation

All Implemented Interfaces:

NamedWriteable, Writeable, ToXContent, ToXContentFragment, Aggregation

Direct Known Subclasses:

InternalGeoBounds, InternalGeoCentroid, InternalMultiBucketAggregation, InternalNumericMetricsAggregation, InternalScriptedMetric, InternalSingleBucketAggregation, InternalTopHits

public abstract class InternalAggregation
extends Object
implements Aggregation, NamedWriteable

An internal implementation of Aggregation. Serves as a base class for all aggregation implementations.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	InternalAggregation.ReduceContext

Nested classes/interfaces inherited from interface org.elasticsearch.search.aggregations.Aggregation

Aggregation.CommonFields

Nested classes/interfaces inherited from interface org.elasticsearch.common.xcontent.ToXContent

ToXContent.DelegatingMapParams, ToXContent.MapParams, ToXContent.Params

Nested classes/interfaces inherited from interface org.elasticsearch.common.io.stream.Writeable

Writeable.Reader<V>, Writeable.Writer<V>

Field Summary

Fields

Modifier and Type	Field	Description
protected Map<String,Object>	metaData
protected String	name

Fields inherited from interface org.elasticsearch.search.aggregations.Aggregation

TYPED_KEYS_DELIMITER

Fields inherited from interface org.elasticsearch.common.xcontent.ToXContent

EMPTY_PARAMS

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	InternalAggregation(String name, List<PipelineAggregator> pipelineAggregators, Map<String,Object> metaData)	Constructs an get with a given name.
protected	InternalAggregation(StreamInput in)	Read from a stream.

Method Summary

Modifier and Type	Method	Description
abstract InternalAggregation	doReduce(List<InternalAggregation> aggregations, InternalAggregation.ReduceContext reduceContext)
protected abstract void	doWriteTo(StreamOutput out)
abstract XContentBuilder	doXContentBody(XContentBuilder builder, ToXContent.Params params)
boolean	equals(Object obj)
Map<String,Object>	getMetaData()	Get the optional byte array metadata that was set on the aggregation
String	getName()
Object	getProperty(String path)	Get the value of specified path in the aggregation.
abstract Object	getProperty(List<String> path)
String	getType()
int	hashCode()
boolean	isMapped()	Return true if this aggregation is mapped, and can lead a reduction.
List<PipelineAggregator>	pipelineAggregators()
protected static int	readSize(StreamInput in)	Read a size under the assumption that a value of 0 means unlimited.
InternalAggregation	reduce(List<InternalAggregation> aggregations, InternalAggregation.ReduceContext reduceContext)	Reduces the given aggregations to a single one and returns it.
String	toString()
XContentBuilder	toXContent(XContentBuilder builder, ToXContent.Params params)
protected static void	writeSize(int size, StreamOutput out)	Write a size under the assumption that a value of 0 means unlimited.
void	writeTo(StreamOutput out)	Write this into the StreamOutput.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.elasticsearch.common.io.stream.NamedWriteable

getWriteableName

Methods inherited from interface org.elasticsearch.common.xcontent.ToXContentFragment

isFragment

Field Detail

name

protected final String name

metaData

protected final Map<String,Object> metaData

Constructor Detail

InternalAggregation

protected InternalAggregation(String name,
                              List<PipelineAggregator> pipelineAggregators,
                              Map<String,Object> metaData)

Constructs an get with a given name.

Parameters:

name - The name of the get.

InternalAggregation

protected InternalAggregation(StreamInput in)
                       throws IOException

Read from a stream.

Throws:

IOException

Method Detail

writeTo

public final void writeTo(StreamOutput out)
                   throws IOException

Description copied from interface: Writeable

Write this into the StreamOutput.

Specified by:

writeTo in interface Writeable

Throws:

IOException

doWriteTo

protected abstract void doWriteTo(StreamOutput out)
                           throws IOException

Throws:

IOException

getName

public String getName()

Specified by:

getName in interface Aggregation

Returns:

The name of this aggregation.

reduce

public final InternalAggregation reduce(List<InternalAggregation> aggregations,
                                        InternalAggregation.ReduceContext reduceContext)

Reduces the given aggregations to a single one and returns it. In most cases, the assumption will be the all given aggregations are of the same type (the same type as this aggregation). For best efficiency, when implementing, try reusing an existing instance (typically the first in the given list) to save on redundant object construction.

doReduce

public abstract InternalAggregation doReduce(List<InternalAggregation> aggregations,
                                             InternalAggregation.ReduceContext reduceContext)

isMapped

public boolean isMapped()

Return true if this aggregation is mapped, and can lead a reduction. If this agg returns false, it should return itself if asked to lead a reduction

getProperty

public Object getProperty(String path)

Get the value of specified path in the aggregation.

Parameters:

path - the path to the property in the aggregation tree

Returns:

the value of the property

getProperty

public abstract Object getProperty(List<String> path)

readSize

protected static int readSize(StreamInput in)
                       throws IOException

Read a size under the assumption that a value of 0 means unlimited.

Throws:

IOException

writeSize

protected static void writeSize(int size,
                                StreamOutput out)
                         throws IOException

Write a size under the assumption that a value of 0 means unlimited.

Throws:

IOException

getMetaData

public Map<String,Object> getMetaData()

Description copied from interface: Aggregation

Get the optional byte array metadata that was set on the aggregation

Specified by:

getMetaData in interface Aggregation

pipelineAggregators

public List<PipelineAggregator> pipelineAggregators()

getType

public String getType()

Specified by:

getType in interface Aggregation

Returns:

a string representing the type of the aggregation. This type is added to the aggregation name in the response, so that it can later be used by clients to determine type of the aggregation and parse it into the proper object.

toXContent

public final XContentBuilder toXContent(XContentBuilder builder,
                                        ToXContent.Params params)
                                 throws IOException

Specified by:

toXContent in interface ToXContent

Throws:

IOException

doXContentBody

public abstract XContentBuilder doXContentBody(XContentBuilder builder,
                                               ToXContent.Params params)
                                        throws IOException

Throws:

IOException

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

toString

public String toString()

Overrides:

toString in class Object