OptionValidator

```
public interface OptionValidator
```
Callback interface for validating a list of options with values.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.lang.String`	`validateOptions(java.util.List<Option> options)`	Validates the options if valid, returns null.

- Method Detail
  - validateOptions
```
java.lang.String validateOptions(java.util.List<Option> options)
```
    Validates the options if valid, returns null. Otherwise an error message is returned.
    
    Parameters:
    
    options - the options to be validated.
    
    Returns:
    
    null, if the options have valid values. Otherwise return an error message.