org.datanucleus.query.evaluator.memory

Class MathFunctionEvaluator

java.lang.Object

org.datanucleus.query.evaluator.memory.MathFunctionEvaluator

All Implemented Interfaces:

InvocationEvaluator

Direct Known Subclasses:

AbsFunctionEvaluator, ArcCosineFunctionEvaluator, ArcSineFunctionEvaluator, ArcTangentFunctionEvaluator, CeilFunctionEvaluator, CosineFunctionEvaluator, ExpFunctionEvaluator, FloorFunctionEvaluator, LogFunctionEvaluator, SineFunctionEvaluator, SqrtFunctionEvaluator, TangentFunctionEvaluator

public abstract class MathFunctionEvaluator
extends Object
implements InvocationEvaluator

Evaluator for mathematical function XYZ(numExpr).

Field Summary

Fields

Modifier and Type	Field and Description
protected static Localiser	LOCALISER Localisation utility for output messages

Constructor Summary

Constructors

Constructor and Description
MathFunctionEvaluator()

Method Summary

Methods

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

Field Detail

LOCALISER

protected static final Localiser LOCALISER

Localisation utility for output messages

Constructor Detail

MathFunctionEvaluator

public MathFunctionEvaluator()

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)