Package com.arcadedb.query.sql.function.coll

Class SQLFunctionMultiValueAbstract<T>

java.lang.Object

com.arcadedb.query.sql.function.SQLFunctionAbstract

com.arcadedb.query.sql.function.SQLFunctionConfigurableAbstract

com.arcadedb.query.sql.function.coll.SQLFunctionMultiValueAbstract<T>

All Implemented Interfaces:

SQLFunction

Direct Known Subclasses:

SQLFunctionDifference, SQLFunctionIntersect, SQLFunctionList, SQLFunctionMap, SQLFunctionSet, SQLFunctionSymmetricDifference, SQLFunctionUnionAll

public abstract class SQLFunctionMultiValueAbstract<T>
extends SQLFunctionConfigurableAbstract

Abstract class for multi-value based function implementations.

Author:

Luca Garulli (l.garulli--(at)--gmail.com)

Field Summary

Fields

Modifier and Type	Field	Description
protected T	context

Fields inherited from class com.arcadedb.query.sql.function.SQLFunctionConfigurableAbstract

configuredParameters

Fields inherited from class com.arcadedb.query.sql.function.SQLFunctionAbstract

name

Constructor Summary

Constructors

Constructor	Description
SQLFunctionMultiValueAbstract(String iName, int iMinParams, int iMaxParams)

Method Summary

Modifier and Type	Method	Description
boolean	aggregateResults()	A function can make calculation on several records before returning a result.
T	getResult()	Only called when function aggregates results after all records have been passed to the function.

Methods inherited from class com.arcadedb.query.sql.function.SQLFunctionConfigurableAbstract

config, toString

Methods inherited from class com.arcadedb.query.sql.function.SQLFunctionAbstract

getName

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.arcadedb.query.sql.executor.SQLFunction

execute, getSyntax

Field Detail

context

protected T context

Constructor Detail

SQLFunctionMultiValueAbstract

public SQLFunctionMultiValueAbstract(String iName,
                                     int iMinParams,
                                     int iMaxParams)

Method Detail

aggregateResults

public boolean aggregateResults()

Description copied from interface: SQLFunction

A function can make calculation on several records before returning a result.

Example of such function : sum, count, max, min ...

The final result of the aggregation is obtained by calling SQLFunction.getResult()

Specified by:

aggregateResults in interface SQLFunction

Overrides:

aggregateResults in class SQLFunctionAbstract

Returns:

true if function aggregate results

getResult

public T getResult()

Description copied from interface: SQLFunction

Only called when function aggregates results after all records have been passed to the function.

Specified by:

getResult in interface SQLFunction

Overrides:

getResult in class SQLFunctionAbstract

Returns:

Aggregation result