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com.tangosol.util.aggregator
Class AbstractBigDecimalAggregator

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

All Implemented Interfaces:

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

Direct Known Subclasses:

BigDecimalAverage, BigDecimalMax, BigDecimalMin, BigDecimalSum

public abstract class AbstractBigDecimalAggregator

extends AbstractAggregator

Abstract aggregator that processes Comparable values extracted from a set of entries in a Map and returns a result in a form of a BigDecimal value. All the extracted objects will be treated as BigDecimal, BigInteger or Java double values. If the set of entries is empty, a null result is returned.

Since:

Coherence 3.2

Author:

gg 2006.02.13

Nested Class Summary

Nested classes/interfaces inherited from interface com.tangosol.util.InvocableMap.ParallelAwareAggregator

InvocableMap.ParallelAwareAggregator.PartialResultAggregator

Field Summary

protected int	m_count The count of processed entries.
protected java.math.BigDecimal	m_decResult The running result value.

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

m_fParallel

Constructor Summary

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

AbstractBigDecimalAggregator(java.lang.String sMethod)
Construct an AbstractBigDecimalAggregator object.

AbstractBigDecimalAggregator(ValueExtractor extractor)
Construct an AbstractBigDecimalAggregator object.

Method Summary

static java.math.BigDecimal	ensureBigDecimal(java.lang.Number num) Ensure the specified Number is a BigDecimal value or convert it into a new BigDecimal object.
protected java.lang.Object	finalizeResult(boolean fFinal) Obtain the result of the aggregation.
protected void	init(boolean fFinal) Initialize the aggregation result.

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

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

Methods inherited from class com.tangosol.util.BitHelper

countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString, toBytes, toBytes, toBytes, toBytes, toInt, toInt, toLong, toLong

Field Detail

m_count

protected transient int m_count

The count of processed entries.

m_decResult

protected transient java.math.BigDecimal m_decResult

The running result value.

Constructor Detail

AbstractBigDecimalAggregator

public AbstractBigDecimalAggregator()

Default constructor (necessary for the ExternalizableLite interface).

AbstractBigDecimalAggregator

public AbstractBigDecimalAggregator(ValueExtractor extractor)

Construct an AbstractBigDecimalAggregator object.

Parameters:

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

AbstractBigDecimalAggregator

public AbstractBigDecimalAggregator(java.lang.String sMethod)

Construct an AbstractBigDecimalAggregator object.

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.

Specified by:

init in class AbstractAggregator

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

finalizeResult

protected java.lang.Object finalizeResult(boolean fFinal)

Obtain the result of the aggregation.

If the fFinal parameter is true, the returned object must be the final result of the aggregation; otherwise, the returned object will be treated as a partial result that should be incorporated into the final result.

Specified by:

finalizeResult in class AbstractAggregator

Parameters:

fFinal - true to indicate that the final result of the aggregation process should be returned; this will only be false if a parallel approach is being used

Returns:

the result of the aggregation process

ensureBigDecimal

public static java.math.BigDecimal ensureBigDecimal(java.lang.Number num)

Ensure the specified Number is a BigDecimal value or convert it into a new BigDecimal object.

Parameters:

num - a Number object

Returns:

a BigDecimal object that is equal to the passed in Number

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