org.apache.solr.analytics.function.reduction.data

Class UniqueCollector<T>

java.lang.Object

org.apache.solr.analytics.function.reduction.data.ReductionDataCollector<UniqueCollector.UniqueData<T>>

org.apache.solr.analytics.function.reduction.data.UniqueCollector<T>

Direct Known Subclasses:

UniqueCollector.UniqueDoubleCollector, UniqueCollector.UniqueFloatCollector, UniqueCollector.UniqueIntCollector, UniqueCollector.UniqueLongCollector, UniqueCollector.UniqueStringCollector

public abstract class UniqueCollector<T>
extends ReductionDataCollector<UniqueCollector.UniqueData<T>>

Collects the number of unique values that exist for the given parameter.

Supported types are:

• Int
• Long
• Float
• Double
• Date (through longs)
• String

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	UniqueCollector.UniqueData<T>
static class	UniqueCollector.UniqueDoubleCollector
static class	UniqueCollector.UniqueFloatCollector
static class	UniqueCollector.UniqueIntCollector
static class	UniqueCollector.UniqueLongCollector
static class	UniqueCollector.UniqueStringCollector

Field Summary

Fields

Modifier and Type	Field and Description
static String	name

Fields inherited from class org.apache.solr.analytics.function.reduction.data.ReductionDataCollector

collectionTargets, ioData, lastingTargets

Constructor Summary

Constructors

Constructor and Description
UniqueCollector(AnalyticsValueStream param)

Method Summary

Modifier and Type	Method and Description
protected void	apply(UniqueCollector.UniqueData<T> data) Apply the collected info to the given reduction data.
long	count() Get the count of unique values in the set data.
T	exportNext()
String	getExpressionStr() The unique expression string of the reduction data collector, given all inputs and parameters.
String	getName() Get the name of the reduction data collector.
UniqueCollector.UniqueData<T>	newData() A clean slate to start a new reduction.
void	setData(ReductionData data) Finalize the reduction with the collected data stored in the parameter.
void	setMergedData(ReductionData data) Finalize the reduction with the merged data stored in the parameter.
int	startExport()

Methods inherited from class org.apache.solr.analytics.function.reduction.data.ReductionDataCollector

addCollectTarget, addLastingCollectTarget, clearLastingCollectTargets, collect, collectAndApply, dataIO, newDataIO, newDataTarget, submitReservations

Methods inherited from class java.lang.Object

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

Field Detail

name

public static final String name

See Also:

Constant Field Values

Constructor Detail

UniqueCollector

public UniqueCollector(AnalyticsValueStream param)

Method Detail

count

public long count()

Get the count of unique values in the set data.

Returns:

the count of unique values

newData

public UniqueCollector.UniqueData<T> newData()

Description copied from class: ReductionDataCollector

A clean slate to start a new reduction.

Specified by:

newData in class ReductionDataCollector<UniqueCollector.UniqueData<T>>

Returns:

the new reduction data

apply

protected void apply(UniqueCollector.UniqueData<T> data)

Description copied from class: ReductionDataCollector

Apply the collected info to the given reduction data. Should always be called after a ReductionDataCollector.collect() call.

Specified by:

apply in class ReductionDataCollector<UniqueCollector.UniqueData<T>>

Parameters:

data - reduction data to apply collected info to

startExport

public int startExport()

exportNext

public T exportNext()

setMergedData

public void setMergedData(ReductionData data)

Description copied from class: ReductionDataCollector

Finalize the reduction with the merged data stored in the parameter. Once the reduction is finalized, the ReductionFunctions that use this data collector act like regular AnalyticsValue classes that can be accessed through their get<value-type> methods. (FOR CLOUD)

Specified by:

setMergedData in class ReductionDataCollector<UniqueCollector.UniqueData<T>>

Parameters:

data - the merged data to compute a reduction for

setData

public void setData(ReductionData data)

Description copied from class: ReductionDataCollector

Finalize the reduction with the collected data stored in the parameter. Once the reduction is finalized, the ReductionFunctions that use this data collector act like regular AnalyticsValue classes that can be accessed through their get<value-type> methods. (FOR SINGLE-SHARD)

Specified by:

setData in class ReductionDataCollector<UniqueCollector.UniqueData<T>>

Parameters:

data - the collected data to compute a reduction for

getName

public String getName()

Description copied from class: ReductionDataCollector

Get the name of the reduction data collector. This is the same across all instances of the data collector.

Specified by:

getName in class ReductionDataCollector<UniqueCollector.UniqueData<T>>

Returns:

the name

getExpressionStr

public String getExpressionStr()

Description copied from class: ReductionDataCollector

The unique expression string of the reduction data collector, given all inputs and parameters. Used during ReductionDataCollector syncing. Since the string should be unique, only one of expression is kept.

Specified by:

getExpressionStr in class ReductionDataCollector<UniqueCollector.UniqueData<T>>

Returns:

the expression string