org.eclipse.birt.data.engine.api.aggregation
Class Aggregation

java.lang.Object
  org.eclipse.birt.data.engine.api.aggregation.Aggregation

All Implemented Interfaces:

IAggregation

public abstract class Aggregation

extends java.lang.Object

implements IAggregation

All multipass aggregations must implement this interface.

Field Summary

Fields inherited from interface org.eclipse.birt.data.engine.api.aggregation.IAggregation

RUNNING_AGGR, SUMMARY_AGGR

Constructor Summary

Aggregation()

Method Summary

int	getNumberOfPasses() Returns the number of passes over the data series that the accumulator of this aggregate requires.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.birt.data.engine.api.aggregation.IAggregation

getName, getParameterDefn, getType, newAccumulator

Constructor Detail

Aggregation

public Aggregation()

Method Detail

getNumberOfPasses

public int getNumberOfPasses()

Returns the number of passes over the data series that the accumulator of this aggregate requires. For SUMMARY aggregates, the accumulator returns a value after all passes are complete. For RUNNING aggregates, the accumulator returns data in the last pass.

Returns: