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java.lang.Objectorg.apache.derby.impl.sql.execute.GenericAggregator
class GenericAggregator
Adaptor that sits between execution layer and aggregates.
Field Summary | |
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private AggregatorInfo |
aggInfo
|
(package private) int |
aggregatorColumnId
|
private ExecAggregator |
cachedAggregator
|
private ClassFactory |
cf
|
private int |
inputColumnId
|
private int |
resultColumnId
|
Constructor Summary | |
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GenericAggregator(AggregatorInfo aggInfo,
ClassFactory cf)
Constructor: |
Method Summary | |
---|---|
(package private) void |
accumulate(DataValueDescriptor inputColumn,
DataValueDescriptor aggregatorColumn)
Accumulate the aggregate results. |
(package private) void |
accumulate(ExecRow inputRow,
ExecRow accumulateRow)
Accumulate the aggregate results. |
(package private) void |
accumulate(java.lang.Object[] inputRow,
java.lang.Object[] accumulateRow)
Accumulate the aggregate results. |
(package private) boolean |
finish(ExecRow row)
Get the results of the aggregation and put it in the result column. |
(package private) AggregatorInfo |
getAggregatorInfo()
|
(package private) ExecAggregator |
getAggregatorInstance()
Get a new instance of the aggregator and initialize it. |
(package private) int |
getColumnId()
Return the column id that is being aggregated |
(package private) DataValueDescriptor |
getInputColumnValue(ExecRow row)
|
(package private) void |
initialize(ExecRow row)
Initialize the aggregator |
(package private) void |
merge(ExecRow inputRow,
ExecRow mergeRow)
Merge the aggregate results. |
(package private) void |
merge(java.lang.Object[] inputRow,
java.lang.Object[] mergeRow)
Merge the aggregate results. |
(package private) void |
merge(Storable aggregatorColumnIn,
Storable aggregatorColumnOut)
Merge two partial aggregations. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private final AggregatorInfo aggInfo
int aggregatorColumnId
private int inputColumnId
private int resultColumnId
private final ClassFactory cf
private ExecAggregator cachedAggregator
Constructor Detail |
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GenericAggregator(AggregatorInfo aggInfo, ClassFactory cf)
aggInfo
- information about the user aggregatecf
- the class factory.Method Detail |
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void initialize(ExecRow row) throws StandardException
row
- the row with the aggregator to be initialized
StandardException
- on errorvoid accumulate(ExecRow inputRow, ExecRow accumulateRow) throws StandardException
inputRow
- the row with the input columaccumulateRow
- the row with the aggregator
StandardException
- on errorvoid accumulate(java.lang.Object[] inputRow, java.lang.Object[] accumulateRow) throws StandardException
inputRow
- the row with the input columaccumulateRow
- the row with the aggregator
StandardException
- on errorvoid accumulate(DataValueDescriptor inputColumn, DataValueDescriptor aggregatorColumn) throws StandardException
inputColumn
- aggregatorColumn
-
StandardException
- on errorvoid merge(ExecRow inputRow, ExecRow mergeRow) throws StandardException
inputRow
- the row with the input colummergeRow
- the row with the aggregator
StandardException
- on errorvoid merge(java.lang.Object[] inputRow, java.lang.Object[] mergeRow) throws StandardException
inputRow
- the row with the input colummergeRow
- the row with the aggregator
StandardException
- on errorboolean finish(ExecRow row) throws StandardException
row
- the row with the result and the aggregator
StandardException
- on errorExecAggregator getAggregatorInstance() throws StandardException
StandardException
- on errorint getColumnId()
DataValueDescriptor getInputColumnValue(ExecRow row) throws StandardException
StandardException
void merge(Storable aggregatorColumnIn, Storable aggregatorColumnOut) throws StandardException
StandardException
- on errorAggregatorInfo getAggregatorInfo()
|
Built on Thu 2010-12-23 20:49:13+0000, from revision ??? | ||||||||
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