com.tangosol.util.aggregator
Class DoubleSum

java.lang.Object
  com.tangosol.util.Base
      com.tangosol.util.BitHelper
          com.tangosol.util.ExternalizableHelper
              com.tangosol.util.aggregator.AbstractAggregator
                  com.tangosol.util.aggregator.AbstractDoubleAggregator
                      com.tangosol.util.aggregator.DoubleSum

All Implemented Interfaces:

ExternalizableLite, PortableObject, InvocableMap.EntryAggregator, InvocableMap.ParallelAwareAggregator, Serializable

public class DoubleSum
extends AbstractDoubleAggregator

Sums up numeric values extracted from a set of entries in a Map. All the extracted Number objects will be treated as Java double values.

Since:

Coherence 3.1

Author:

gg 2005.09.05

Field Summary

Fields inherited from class com.tangosol.util.aggregator.AbstractDoubleAggregator

m_count, m_dflResult

Fields inherited from class com.tangosol.util.aggregator.AbstractAggregator

m_fParallel

Constructor Summary

DoubleSum()
Default constructor (necessary for the ExternalizableLite interface).

DoubleSum(String sMethod)
Construct a DoubleSum aggregator.

DoubleSum(ValueExtractor extractor)
Construct a DoubleSum aggregator.

Method Summary

protected void	init(boolean fFinal) Initialize the aggregation result.
protected void	process(Object o, boolean fFinal) Incorporate one aggregatable value into the result.

Methods inherited from class com.tangosol.util.aggregator.AbstractDoubleAggregator

finalizeResult

Methods inherited from class com.tangosol.util.aggregator.AbstractAggregator

aggregate, aggregateResults, equals, getParallelAggregator, getValueExtractor, hashCode, readExternal, readExternal, toString, writeExternal, writeExternal

Methods inherited from class com.tangosol.util.BitHelper

countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, toBitString, toBitString, toBitString

Constructor Detail

DoubleSum

public DoubleSum()

Default constructor (necessary for the ExternalizableLite interface).

DoubleSum

public DoubleSum(ValueExtractor extractor)

Construct a DoubleSum aggregator.

Parameters:

extractor - the extractor that provides a value in the form of any Java object that is a Number

DoubleSum

public DoubleSum(String sMethod)

Construct a DoubleSum aggregator.

Parameters:

sMethod - the name of the method that returns a value in the form of any Java object that is a Number

Method Detail

init

protected void init(boolean fFinal)

Initialize the aggregation result.

Overrides:

init in class AbstractDoubleAggregator

Parameters:

fFinal - true is passed if the aggregation process that is being initialized must produce a final aggregation result; this will only be false if a parallel approach is being used and the initial (partial) aggregation process is being initialized

process

protected void process(Object o,
                       boolean fFinal)

Incorporate one aggregatable value into the result.

If the fFinal parameter is true, the given object is a partial result (returned by an individual parallel aggregator) that should be incorporated into the final result; otherwise, the object is a value extracted from an InvocableMap.Entry.

Specified by:

process in class AbstractAggregator

Parameters:

o - the value to incorporate into the aggregated result

fFinal - true to indicate that the given object is a partial result returned by a parallel aggregator