CommandLine.IDefaultValueProvider (picocli 4.7.6 API)

All Known Implementing Classes:

CommandLine.PropertiesDefaultProvider

Enclosing class:

CommandLine
```
public static interface CommandLine.IDefaultValueProvider
```
Provides default value for a command. Commands may configure a provider with the CommandLine.Command.defaultValueProvider() annotation attribute.

Since:

3.6

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`defaultValue(CommandLine.Model.ArgSpec argSpec)`	Returns the default value for an option or positional parameter or `null`.

- Method Detail
  - defaultValue
```
String defaultValue(CommandLine.Model.ArgSpec argSpec)
             throws Exception
```
    Returns the default value for an option or positional parameter or null. The returned value is converted to the type of the option/positional parameter via the same type converter used when populating this option/positional parameter from a command line argument.
    
    Parameters:
    
    argSpec - the option or positional parameter, never null
    
    Returns:
    
    the default value for the option or positional parameter, or null if this provider has no default value for the specified option or positional parameter
    
    Throws:
    
    Exception - when there was a problem obtaining the default value