uk.ac.starlink.ttools.task

Class TableGroup.AggSpec

java.lang.Object

uk.ac.starlink.ttools.task.TableGroup.AggSpec

Enclosing class:

TableGroup

public static class TableGroup.AggSpec
extends Object

Defines the aggregation that should be done to form an output column.

Constructor Summary

Constructors

Constructor and Description
AggSpec(String expr, Aggregator aggregator, String outName) Constructor.

Method Summary

Modifier and Type	Method and Description
Aggregator	getAggregator() Returns the aggregation method.
String	getExpression() Returns an expression giving the quantity to be aggregated.
String	getOutputName() Returns the output column name, if specified.

Methods inherited from class java.lang.Object

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

Constructor Detail

AggSpec

public AggSpec(String expr,
               Aggregator aggregator,
               String outName)

Constructor.

Parameters:

expr - expression giving quantity to be aggregated

aggregator - aggregation method

outName - output column name, or null for default

Method Detail

getExpression

public String getExpression()

Returns an expression giving the quantity to be aggregated.

Returns:

JEL expression or column name

getAggregator

public Aggregator getAggregator()

Returns the aggregation method.

Returns:

aggregator

getOutputName

public String getOutputName()

Returns the output column name, if specified.

Returns:

user-specified output column name, or null