Qualifier (JMRI API)

All Known Implementing Classes:

AbstractQualifier, ArithmeticQualifier, JComponentQualifier, PaneQualifier, QualifierCombiner, ValueQualifier
```
public interface Qualifier
```
Define capability to watch other things and "Qualify" CVs and Variables.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`currentDesiredState()`	Check whether this Qualifier is currently in the OK, qualified-to-act state.
`void`	`setWatchedAvailable(boolean enable)`	Drive the available or not state of the qualified object.
`void`	`update()`	Process the current value and do whatever is needed.

- Method Detail
  - update
```
void update()
```
    Process the current value and do whatever is needed.
  - currentDesiredState
```
boolean currentDesiredState()
```
    Check whether this Qualifier is currently in the OK, qualified-to-act state.
    
    Returns:
    
    true if this Qualifier is currently saying OK
  - setWatchedAvailable
```
void setWatchedAvailable(boolean enable)
```
    Drive the available or not state of the qualified object.
    Subclasses implement this to control a specific type of qualified object, like a Variable or Pane.
    
    Parameters:
    
    enable - true to drive, else false.