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Oracle® Coherence Java API Reference Release 3.7.1.0 E22843-01 |
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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
public abstract class AbstractDoubleAggregator
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.
Field Summary | |
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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 |
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m_fParallel |
Constructor Summary | |
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AbstractDoubleAggregator() Default constructor (necessary for the ExternalizableLite interface). |
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AbstractDoubleAggregator(java.lang.String sMethod) Construct an AbstractDoubleAggregator object. |
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AbstractDoubleAggregator(ValueExtractor extractor) Construct an AbstractDoubleAggregator object. |
Method Summary | |
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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 |
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aggregate, aggregateResults, equals, getParallelAggregator, getValueExtractor, hashCode, process, processEntry, readExternal, readExternal, toString, writeExternal, writeExternal |
Methods inherited from class com.tangosol.util.BitHelper |
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countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString |
Field Detail |
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protected transient int m_count
protected transient double m_dflResult
Constructor Detail |
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public AbstractDoubleAggregator()
public AbstractDoubleAggregator(ValueExtractor extractor)
extractor
- the extractor that provides a value in the form of any Java object that is a Number
public AbstractDoubleAggregator(java.lang.String sMethod)
sMethod
- the name of the method that returns a value in the form of any Java object that is a Number
Method Detail |
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protected void init(boolean fFinal)
init
in class AbstractAggregator
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 initializedprotected java.lang.Object finalizeResult(boolean fFinal)
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.
finalizeResult
in class AbstractAggregator
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
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Oracle® Coherence Java API Reference Release 3.7.1.0 E22843-01 |
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