FunctionEval (Keikai Spreadsheet Build 6.0.0 API)

java.lang.Object
- org.apache.poi.ss.formula.eval.FunctionEval

```
public final class FunctionEval
extends Object
```
Mappings from the Excel functions to our evaluation implementations (where available)

Field Summary

Fields
Modifier and Type Field Description

protected static Function[] functions
Array elements corresponding to unimplemented functions are null

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static Function`	`getBasicFunction(int functionIndex)`
`static Collection<String>`	`getNotSupportedFunctionNames()`	Returns an array of function names NOT implemented by POI.
`static Collection<String>`	`getSupportedFunctionNames()`	Returns a collection of function names implemented by POI.
`static void`	`registerFunction(String name, Function func)`	Register a new function in runtime.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - functions
```
protected static final Function[] functions
```
    Array elements corresponding to unimplemented functions are null
- Method Detail
  - getBasicFunction
```
public static Function getBasicFunction(int functionIndex)
```
    Returns:
    
    null if the specified functionIndex is for INDIRECT() or any external (add-in) function.
  - registerFunction
```
public static void registerFunction(String name,
                                    Function func)
```
    Register a new function in runtime.
    
    Parameters:
    
    name - the function name
    
    func - the function to register
    
    Throws:
    
    IllegalArgumentException - if the function is unknown or already registered.
    
    Since:
    
    3.8 beta6
  - getSupportedFunctionNames
```
public static Collection<String> getSupportedFunctionNames()
```
    Returns a collection of function names implemented by POI.
    
    Returns:
    
    an array of supported functions
    
    Since:
    
    3.8 beta6
  - getNotSupportedFunctionNames
```
public static Collection<String> getNotSupportedFunctionNames()
```
    Returns an array of function names NOT implemented by POI.
    
    Returns:
    
    an array of not supported functions
    
    Since:
    
    3.8 beta6