Package com.orientechnologies.orient.core.sql.functions.math

Class OSQLFunctionMathAbstract

java.lang.Object

com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

com.orientechnologies.orient.core.sql.functions.OSQLFunctionConfigurableAbstract

com.orientechnologies.orient.core.sql.functions.math.OSQLFunctionMathAbstract

All Implemented Interfaces:

OSQLFunction

Direct Known Subclasses:

OSQLFunctionAbsoluteValue, OSQLFunctionAverage, OSQLFunctionCount, OSQLFunctionDecimal, OSQLFunctionEval, OSQLFunctionHeuristicPathFinderAbstract, OSQLFunctionInterval, OSQLFunctionMax, OSQLFunctionMin, OSQLFunctionPathFinder, OSQLFunctionShortestPath, OSQLFunctionSum

public abstract class OSQLFunctionMathAbstract
extends OSQLFunctionConfigurableAbstract

Abstract class for math function.

Author:

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

Field Summary

Fields inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionConfigurableAbstract

configuredParameters

Fields inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

maxParams, minParams, name

Constructor Summary

Constructors

Constructor	Description
OSQLFunctionMathAbstract(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.
protected Class<? extends Number>	getClassWithMorePrecision(Class<? extends Number> iClass1, Class<? extends Number> iClass2)
protected Number	getContextValue(Object iContext, Class<? extends Number> iClass)
boolean	shouldMergeDistributedResult()	This method correspond to distributed query execution

Methods inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionConfigurableAbstract

config, toString

Methods inherited from class com.orientechnologies.orient.core.sql.functions.OSQLFunctionAbstract

filterResult, getDatabase, getDistributedStorageId, getMaxParams, getMinParams, getName, getResult, getSingleItem, getSingleProperty, mergeDistributedResult, returnDistributedResult, setResult

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.orientechnologies.orient.core.sql.functions.OSQLFunction

execute, getSyntax

Constructor Details

OSQLFunctionMathAbstract

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

Method Details

getContextValue

protected Number getContextValue(Object iContext,
 Class<? extends Number> iClass)

getClassWithMorePrecision

protected Class<? extends Number> getClassWithMorePrecision(Class<? extends Number> iClass1,
 Class<? extends Number> iClass2)

aggregateResults

public boolean aggregateResults()

Description copied from interface: OSQLFunction

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 obtain by calling OSQLFunction.getResult(OCommandContext)

Specified by:

aggregateResults in interface OSQLFunction

Overrides:

aggregateResults in class OSQLFunctionAbstract

Returns:

true if function aggregate results

shouldMergeDistributedResult

public boolean shouldMergeDistributedResult()

Description copied from interface: OSQLFunction

This method correspond to distributed query execution

Specified by:

shouldMergeDistributedResult in interface OSQLFunction

Overrides:

shouldMergeDistributedResult in class OSQLFunctionAbstract

Returns:

true if results that comes from different nodes need to be merged to obtain valid one, false otherwise