UserDefinedFunction (Keikai Spreadsheet Build 6.1.0.1 API)

java.lang.Object
- org.apache.poi.ss.formula.UserDefinedFunction

All Implemented Interfaces:

FreeRefFunction
```
public final class UserDefinedFunction
extends Object
implements FreeRefFunction
```
Common entry point for all user-defined (non-built-in) functions (where AbstractFunctionPtg.field_2_fnc_index == 255)

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static FreeRefFunction instance
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - instance
```
public static final FreeRefFunction instance
```
- Method Detail
  - evaluate
```
public ValueEval evaluate(ValueEval[] args,
                          OperationEvaluationContext ec)
```
    Specified by:
    
    evaluate in interface FreeRefFunction
    
    Parameters:
    
    args - the pre-evaluated arguments for this function. args is never null, nor are any of its elements.
    
    ec - primarily used to identify the source cell containing the formula being evaluated. may also be used to dynamically create reference evals.
    
    Returns:
    
    value
    
    Throws:
    
    IllegalStateException - if first arg is not a FunctionNameEval
    
    NotImplementedFunctionException - if function is not implemented