Package org.apache.felix.gogo.runtime

Class Expression.Function

java.lang.Object

org.apache.felix.gogo.runtime.Expression.Function

Enclosing class:

Expression

public abstract class Expression.Function
extends Object

Abstract definition of a supported expression function. A function is defined by a name, the number of parameters and the actual processing implementation.

Constructor Summary

Constructors

Constructor	Description
Function(String name, int numParams)	Creates a new function with given name and parameter count.

Method Summary

Modifier and Type	Method	Description
abstract BigDecimal	eval(List<BigDecimal> parameters)	Implementation for this function.
BigDecimal	eval(Map<String,Object> variables, List<Object> parameters)
String	getName()
int	getNumParams()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Function

public Function(String name,
                int numParams)

Creates a new function with given name and parameter count.

Parameters:

name - The name of the function.

numParams - The number of parameters for this function.

Method Detail

getName

public String getName()

getNumParams

public int getNumParams()

eval

public BigDecimal eval(Map<String,Object> variables,
                       List<Object> parameters)

eval

public abstract BigDecimal eval(List<BigDecimal> parameters)

Implementation for this function.

Parameters:

parameters - Parameters will be passed by the expression evaluator as a List of BigDecimal values.

Returns:

The function must return a new BigDecimal value as a computing result.

toString

public String toString()

Overrides:

toString in class Object