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

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Function

public Function(java.lang.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 java.lang.String getName()

getNumParams

public int getNumParams()

eval

public java.math.BigDecimal eval(java.util.Map<java.lang.String,java.lang.Object> variables,
                                 java.util.List<java.lang.Object> parameters)

eval

public abstract java.math.BigDecimal eval(java.util.List<java.math.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 java.lang.String toString()

Overrides:

toString in class java.lang.Object