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com.tangosol.util.aggregator
Class ComparableMax

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

All Implemented Interfaces:

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

public class ComparableMax

extends AbstractComparableAggregator

Calculates a maximum among values extracted from a set of entries in a Map. This aggregator is most commonly used with objects that implement Comparable such as String or Date; a Comparator can also be supplied to perform the comparisons.

Since:

Coherence 3.2

Author:

gg 2006.02.13

Field Summary

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

m_comparator, m_count, m_oResult

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

m_fParallel

Constructor Summary

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

ComparableMax(java.lang.String sMethod)
Construct a ComparableMax aggregator.

ComparableMax(ValueExtractor extractor)
Construct a ComparableMax aggregator.

ComparableMax(ValueExtractor extractor, java.util.Comparator comparator)
Construct a ComparableMax aggregator.

Method Summary

protected void

process(java.lang.Object o, boolean fFinal) Incorporate one aggregatable value into the result.

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

finalizeResult, init, readExternal, readExternal, writeExternal, writeExternal

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

aggregate, aggregateResults, equals, getParallelAggregator, getValueExtractor, hashCode, processEntry, toString

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

Constructor Detail

ComparableMax

public ComparableMax()

Default constructor (necessary for the ExternalizableLite interface).

ComparableMax

public ComparableMax(ValueExtractor extractor)

Construct a ComparableMax aggregator.

Parameters:

extractor - the extractor that provides a value in the form of any object that implements Comparable interface

ComparableMax

public ComparableMax(ValueExtractor extractor,
                     java.util.Comparator comparator)

Construct a ComparableMax aggregator.

Parameters:

extractor - the extractor that provides an object to be compared

comparator - the comparator used to compare the extracted object

ComparableMax

public ComparableMax(java.lang.String sMethod)

Construct a ComparableMax aggregator.

Parameters:

sMethod - the name of the method that returns a value in the form of any object that implements Comparable interface

Method Detail

process

protected void process(java.lang.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

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