FeelCustomFunctionProvider (Camunda Platform Javadocs 7.20.0-SNAPSHOT)

```
public interface FeelCustomFunctionProvider
```
Provides one or more functions which can be used in an FEEL expression.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Collection<String>`	`getFunctionNames()`	Returns the names of all functions.
`Optional<CustomFunction>`	`resolveFunction(String functionName)`	Returns the function for the given name.

- Method Detail
  - resolveFunction
```
Optional<CustomFunction> resolveFunction(String functionName)
```
    Returns the function for the given name.
    
    Parameters:
    
    functionName - the name of the function
    
    Returns:
    
    the function or Optional.empty(), if no function is provided for this name
  - getFunctionNames
```
Collection<String> getFunctionNames()
```
    Returns the names of all functions.
    
    Returns:
    
    the names of all functions