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Oracle® Coherence Java API Reference
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## com.tangosol.util.aggregator
Class AbstractDoubleAggregator

    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

All Implemented Interfaces:
  ExternalizableLite, PortableObject, InvocableMap.EntryAggregator, InvocableMap.ParallelAwareAggregator, java.io.Serializable

Direct Known Subclasses:
  DoubleAverage, DoubleMax, DoubleMin, DoubleSum

    public abstract class AbstractDoubleAggregator

extends AbstractAggregator

Abstract aggregator that processes numeric values extracted from a set of entries in a Map. All the extracted Number objects will be treated as Java `double` values and the result of the aggregator is a Double. If the set of entries is empty, a `null` result is returned.

Since:
  Coherence 3.1
Author:
  cp/gg/jh 2005.07.19

Field Summary
`protected int` | `m_count` The count of processed entries.
`protected double` | `m_dflResult` The running result value.

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

Constructor Summary
`AbstractDoubleAggregator()` Default constructor (necessary for the ExternalizableLite interface).
`AbstractDoubleAggregator(java.lang.String sMethod)` Construct an AbstractDoubleAggregator object.
`AbstractDoubleAggregator(ValueExtractor extractor)` Construct an AbstractDoubleAggregator object.

Method Summary
`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, 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`

Field Detail

### m_count

    protected transient int m_count

  The count of processed entries.

### m_dflResult

    protected transient double m_dflResult

  The running result value.

Constructor Detail

### AbstractDoubleAggregator

    public AbstractDoubleAggregator()

  Default constructor (necessary for the ExternalizableLite interface).

### AbstractDoubleAggregator

    public AbstractDoubleAggregator(ValueExtractor extractor)

  Construct an AbstractDoubleAggregator object.

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

### AbstractDoubleAggregator

    public AbstractDoubleAggregator(java.lang.String sMethod)

  Construct an AbstractDoubleAggregator 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

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Oracle® Coherence Java API Reference
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E15583-01
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