StatisticCollector (Eclipse RDF4J 4.2.4)

java.lang.Object
- org.eclipse.rdf4j.query.algebra.evaluation.function.aggregate.StatisticCollector

All Implemented Interfaces:

AggregateCollector

Direct Known Subclasses:

StandardDeviationCollector, VarianceCollector
```
@Experimental
public abstract class StatisticCollector
extends Object
implements AggregateCollector
```
AggregateCollector implementation that processes SPARQL statistical functions based on input Literal values.

Author:

Tomas Kovachev t.kovachev1996@gmail.com

Field Summary

Fields
Modifier and Type	Field	Description
`protected boolean`	`population`
`protected org.apache.commons.math3.stat.descriptive.SummaryStatistics`	`statistics`
`protected ValueExprEvaluationException`	`typeError`
`protected static Literal`	`ZERO`

Constructor Summary

Constructors
Constructor Description

StatisticCollector(boolean population)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addValue(Literal val)`
`protected abstract Literal`	`computeValue()`
`Value`	`getFinalValue()`
`boolean`	`hasError()`
`void`	`setTypeError(ValueExprEvaluationException typeError)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ZERO
```
protected static final Literal ZERO
```

statistics

protected final org.apache.commons.math3.stat.descriptive.SummaryStatistics statistics

population
```
protected final boolean population
```

typeError

protected ValueExprEvaluationException typeError

Constructor Detail

StatisticCollector

public StatisticCollector(boolean population)

Method Detail

getFinalValue
```
public Value getFinalValue()
                    throws ValueExprEvaluationException
```
Specified by:

getFinalValue in interface AggregateCollector

Throws:

ValueExprEvaluationException

setTypeError

public void setTypeError(ValueExprEvaluationException typeError)

hasError
```
public boolean hasError()
```

addValue
```
public void addValue(Literal val)
```

computeValue

protected abstract Literal computeValue()