Package org.openjump.core.ui.plugin.tools.aggregate

Interface Aggregator<T>

All Known Implementing Classes:

Aggregators.BooleanMajority, Aggregators.Collect, Aggregators.Concatenate, Aggregators.ConcatenateUnique, Aggregators.Count, Aggregators.DateMax, Aggregators.DateMean, Aggregators.DateMedian, Aggregators.DateMin, Aggregators.DoubleMax, Aggregators.DoubleMean, Aggregators.DoubleMedian, Aggregators.DoubleMin, Aggregators.DoubleSum, Aggregators.IntMax, Aggregators.IntMean, Aggregators.IntMedian, Aggregators.IntMin, Aggregators.IntSum, Aggregators.LongMax, Aggregators.LongMean, Aggregators.LongMedian, Aggregators.LongMin, Aggregators.LongSum, Aggregators.StringMajority, Aggregators.StringMax, Aggregators.StringMin, Aggregators.Union

public interface Aggregator<T>

An aggregator accumulate individual values with addValue method and return a synthetic value with getResult method.

Field Summary

Fields

Modifier and Type	Field	Description
static String	SEPARATOR_NAME

Method Summary

Modifier and Type	Method	Description
void	addValue(T value)	Adds a new value to the aggregator.
Aggregator<?>	clone()	Create a new Aggregator with the same attributes as this one.
String	getName()	Returns the name of this Aggregator.
AttributeType	getOutputAttributeType()
Object	getParameter(String name)	Returns parameter value for name parameter.
Set<String>	getParameters()	Return parameter names used by this aggregator
Object	getResult()
List<T>	getValues()
boolean	ignoreNull()	Returns true if this aggregator must ignore null values.
void	reset()	Reset the aggregator (clear the list of values)
void	setIgnoreNull(boolean ignoreNull)	Change the way this aggregator process null values.
void	setParameter(String name, Object value)	Set a parameter value for this aggregator.

Field Detail

SEPARATOR_NAME

static final String SEPARATOR_NAME

See Also:

Constant Field Values

Method Detail

clone

Aggregator<?> clone()

Create a new Aggregator with the same attributes as this one.

ignoreNull

boolean ignoreNull()

Returns true if this aggregator must ignore null values.

setIgnoreNull

void setIgnoreNull(boolean ignoreNull)

Change the way this aggregator process null values.

getParameters

Set<String> getParameters()

Return parameter names used by this aggregator

Returns:

the set of parameters

setParameter

void setParameter(String name,
                  Object value)

Set a parameter value for this aggregator.

Parameters:

name - the name of the aggregator

value - the new value of the parameter

getParameter

Object getParameter(String name)

Returns parameter value for name parameter.

Parameters:

name - the name of the parameter

getName

String getName()

Returns the name of this Aggregator.

getOutputAttributeType

AttributeType getOutputAttributeType()

Returns:

the AttributeType of the aggregated value.

addValue

void addValue(T value)

Adds a new value to the aggregator.

Parameters:

value - value to be added

getValues

List<T> getValues()

Returns:

the values accumulated by this aggregator.

getResult

Object getResult()

Returns:

the aggregated value.

reset

void reset()

Reset the aggregator (clear the list of values)