Package org.datanucleus.store.query.inmemory.method

Class MathFunction

java.lang.Object

org.datanucleus.store.query.inmemory.method.MathFunction

All Implemented Interfaces:

InvocationEvaluator

Direct Known Subclasses:

AbsFunction, ArcCosineFunction, ArcSineFunction, ArcTangent2Function, ArcTangentFunction, CeilFunction, CoshFunction, CosineFunction, CotangentFunction, DegreesFunction, ExpFunction, FloorFunction, LogFunction, RadiansFunction, SignFunction, SineFunction, SinhFunction, SqrtFunction, TangentFunction, TanhFunction

public abstract class MathFunction
extends java.lang.Object
implements InvocationEvaluator

Evaluator for mathematical function XYZ(numExpr).

Constructor Summary

Constructors

Constructor	Description
MathFunction()

Method Summary

Modifier and Type	Method	Description
java.lang.Object	evaluate(InvokeExpression expr, java.lang.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 double	evaluateMathFunction(double num1, double num2)
protected abstract java.lang.String	getFunctionName()
protected java.lang.Object	getParamValueForParam(java.lang.Object param, InMemoryExpressionEvaluator eval, java.lang.String method)

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 java.lang.Object evaluate(InvokeExpression expr,
                                 java.lang.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 java.lang.String getFunctionName()

evaluateMathFunction

protected abstract double evaluateMathFunction(double num)

evaluateMathFunction

protected double evaluateMathFunction(double num1,
                                      double num2)

getParamValueForParam

protected java.lang.Object getParamValueForParam(java.lang.Object param,
                                                 InMemoryExpressionEvaluator eval,
                                                 java.lang.String method)