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Oracle® Coherence Java API Reference Release 3.6.0.0 E15725-01 |
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java.lang.Object
com.tangosol.util.Base
com.tangosol.util.aggregator.Count
public class Count
Calculates a number of values in an entry set.
Constructor Summary | |
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Count() Default constructor (necessary for the ExternalizableLite interface). |
Method Summary | |
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Object |
aggregate(Set setEntries) Process a set of InvocableMap.Entry objects in order to produce an aggregated result. |
Object |
aggregateResults(Collection collResults) Aggregate the results of the parallel aggregations. |
InvocableMap.EntryAggregator |
getParallelAggregator() Get an aggregator that can take the place of this aggregator in situations in which the InvocableMap can aggregate in parallel. |
void |
readExternal(DataInput in) Restore the contents of this object by loading the object's state from the passed DataInput object. |
void |
readExternal(PofReader in) Restore the contents of a user type instance by reading its state using the specified PofReader object. |
void |
writeExternal(DataOutput out) Save the contents of this object by storing the object's state into the passed DataOutput object. |
void |
writeExternal(PofWriter out) Save the contents of a POF user type instance by writing its state using the specified PofWriter object. |
Constructor Detail |
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public Count()
Method Detail |
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public Object aggregate(Set setEntries)
aggregate
in interface InvocableMap.EntryAggregator
setEntries
- a Set of read-only InvocableMap.Entry objects to aggregatepublic InvocableMap.EntryAggregator getParallelAggregator()
getParallelAggregator
in interface InvocableMap.ParallelAwareAggregator
public Object aggregateResults(Collection collResults)
aggregateResults
in interface InvocableMap.ParallelAwareAggregator
collResults
- the parallel aggregation resultspublic void readExternal(DataInput in) throws IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore the state of this objectIOException
- if an I/O exception occursNotActiveException
- if the object is not in its initial state, and therefore cannot be deserialized intopublic void writeExternal(DataOutput out) throws IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object toIOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's stateIOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's stateIOException
- if an I/O error occurs
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Oracle® Coherence Java API Reference Release 3.6.0.0 E15725-01 |
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