org.datanucleus.query.inmemory

Class MathFunction

java.lang.Object

org.datanucleus.query.inmemory.MathFunction

All Implemented Interfaces:

InvocationEvaluator

Direct Known Subclasses:

AbsFunction, ArcCosineFunction, ArcSineFunction, ArcTangentFunction, CeilFunction, CosineFunction, DegreesFunction, ExpFunction, FloorFunction, LogFunction, RadiansFunction, SineFunction, SqrtFunction, TangentFunction

public abstract class MathFunction
extends Object
implements InvocationEvaluator

Evaluator for mathematical function XYZ(numExpr).

Constructor Summary

Constructors

Constructor and Description
MathFunction()

Method Summary

Modifier and Type	Method and Description
Object	evaluate(InvokeExpression expr, Object invokedValue, InMemoryExpressionEvaluator eval) Method to evaluate the InvokeExpression, as part of the overall evaluation defined by the InMemoryExpressionEvaluator.
protected abstract double	evaluateMathFunction(double num)
protected abstract String	getFunctionName()

Methods inherited from class java.lang.Object

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

Constructor Detail

MathFunction

public MathFunction()

Method Detail

evaluate

public Object evaluate(InvokeExpression expr,
                       Object invokedValue,
                       InMemoryExpressionEvaluator eval)

Description copied from interface: InvocationEvaluator

Method to evaluate the InvokeExpression, as part of the overall evaluation defined by the InMemoryExpressionEvaluator.

Specified by:

evaluate in interface InvocationEvaluator

Parameters:

expr - The expression for invocation

invokedValue - Value on which we are invoking

eval - The overall evaluator for in-memory

Returns:

The result

getFunctionName

protected abstract String getFunctionName()

evaluateMathFunction

protected abstract double evaluateMathFunction(double num)