Package org.apache.felix.gogo.runtime
Class Expression.Function
- java.lang.Object
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- org.apache.felix.gogo.runtime.Expression.Function
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- 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.
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Method Summary
All Methods Instance Methods Abstract Methods Concrete Methods 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()
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Constructor Detail
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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.
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Method Detail
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getName
public String getName()
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getNumParams
public int getNumParams()
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eval
public abstract BigDecimal eval(List<BigDecimal> parameters)
Implementation for this function.- Parameters:
parameters
- Parameters will be passed by the expression evaluator as aList
ofBigDecimal
values.- Returns:
- The function must return a new
BigDecimal
value as a computing result.
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