Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> sql >> [ execute overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

org.apache.derby.impl.sql.execute
Class GenericAggregator  

java.lang.Object
  org.apache.derby.impl.sql.execute.GenericAggregator

---

class GenericAggregator

extends java.lang.Object

Adaptor that sits between execution layer and aggregates.

---

Field Summary
(package private)  AggregatorInfo	aggInfo
(package private)  int	aggregatorColumnId
private  org.apache.derby.iapi.sql.execute.ExecAggregator	cachedAggregator
private  org.apache.derby.iapi.services.loader.ClassFactory	cf
private  TemporaryRowHolderResultSet	execResultSet
private  int	inputColumnId
private  org.apache.derby.iapi.sql.ResultDescription	inputColumnResultDescription
private  int	resultColumnId
private  org.apache.derby.iapi.sql.execute.ExecRow[]	rowArray

 

Constructor Summary
(package private)	GenericAggregator(AggregatorInfo aggInfo, org.apache.derby.iapi.services.loader.ClassFactory cf)           Constructor:

 

Method Summary
(package private)  void	accumulate(org.apache.derby.iapi.types.DataValueDescriptor inputColumn, org.apache.derby.iapi.types.DataValueDescriptor aggregatorColumn)           Accumulate the aggregate results.
(package private)  void	accumulate(org.apache.derby.iapi.sql.execute.ExecRow inputRow, org.apache.derby.iapi.sql.execute.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(org.apache.derby.iapi.sql.execute.ExecRow row)           Get the results of the aggregation and put it in the result column.
(package private)  AggregatorInfo	getAggregatorInfo()
(package private)  org.apache.derby.iapi.sql.execute.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)  void	initialize(org.apache.derby.iapi.sql.execute.ExecRow row)           Initialize the aggregator
(package private)  void	merge(org.apache.derby.iapi.sql.execute.ExecRow inputRow, org.apache.derby.iapi.sql.execute.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(org.apache.derby.iapi.services.io.Storable aggregatorColumnIn, org.apache.derby.iapi.services.io.Storable aggregatorColumnOut)           Merge two partial aggregations.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

aggInfo

AggregatorInfo aggInfo

---

aggregatorColumnId

int aggregatorColumnId

---

inputColumnId

private int inputColumnId

---

resultColumnId

private int resultColumnId

---

inputColumnResultDescription

private org.apache.derby.iapi.sql.ResultDescription inputColumnResultDescription

---

rowArray

private org.apache.derby.iapi.sql.execute.ExecRow[] rowArray

---

execResultSet

private TemporaryRowHolderResultSet execResultSet

---

cf

private final org.apache.derby.iapi.services.loader.ClassFactory cf

---

cachedAggregator

private org.apache.derby.iapi.sql.execute.ExecAggregator cachedAggregator

Constructor Detail

GenericAggregator

GenericAggregator(AggregatorInfo aggInfo,
                  org.apache.derby.iapi.services.loader.ClassFactory cf)

Constructor:

Method Detail

initialize

void initialize(org.apache.derby.iapi.sql.execute.ExecRow row)
          throws org.apache.derby.iapi.error.StandardException

Initialize the aggregator

---

accumulate

void accumulate(org.apache.derby.iapi.sql.execute.ExecRow inputRow,
                org.apache.derby.iapi.sql.execute.ExecRow accumulateRow)
          throws org.apache.derby.iapi.error.StandardException

Accumulate the aggregate results. This is the guts of the aggregation. We will call the user aggregate on itself to do the aggregation.

---

accumulate

void accumulate(java.lang.Object[] inputRow,
                java.lang.Object[] accumulateRow)
          throws org.apache.derby.iapi.error.StandardException

Accumulate the aggregate results. This is the guts of the aggregation. We will call the user aggregate on itself to do the aggregation.

---

accumulate

void accumulate(org.apache.derby.iapi.types.DataValueDescriptor inputColumn,
                org.apache.derby.iapi.types.DataValueDescriptor aggregatorColumn)
          throws org.apache.derby.iapi.error.StandardException

Accumulate the aggregate results. This is the guts of the aggregation. We will call the user aggregate on itself to do the aggregation.

---

merge

void merge(org.apache.derby.iapi.sql.execute.ExecRow inputRow,
           org.apache.derby.iapi.sql.execute.ExecRow mergeRow)
     throws org.apache.derby.iapi.error.StandardException

Merge the aggregate results. This is the guts of the aggregation. We will call the user aggregate on itself to do the aggregation.

---

merge

void merge(java.lang.Object[] inputRow,
           java.lang.Object[] mergeRow)
     throws org.apache.derby.iapi.error.StandardException

Merge the aggregate results. This is the guts of the aggregation. We will call the user aggregate on itself to do the aggregation.

---

finish

boolean finish(org.apache.derby.iapi.sql.execute.ExecRow row)
         throws org.apache.derby.iapi.error.StandardException

Get the results of the aggregation and put it in the result column.

---

getAggregatorInstance

org.apache.derby.iapi.sql.execute.ExecAggregator getAggregatorInstance()
                                                                 throws org.apache.derby.iapi.error.StandardException

Get a new instance of the aggregator and initialize it.

---

getColumnId

int getColumnId()

Return the column id that is being aggregated

---

merge

void merge(org.apache.derby.iapi.services.io.Storable aggregatorColumnIn,
           org.apache.derby.iapi.services.io.Storable aggregatorColumnOut)
     throws org.apache.derby.iapi.error.StandardException

Merge two partial aggregations. This is how the sorter merges partial aggregates.

---

getAggregatorInfo

AggregatorInfo getAggregatorInfo()

---

Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> sql >> [ execute overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---