PermissionFunction (velocity-api 3.2.0-SNAPSHOT API)

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface PermissionFunction
```
Function that calculates the permission settings for a given PermissionSubject.

Field Summary

Fields
Modifier and Type	Field	Description
`static PermissionFunction`	`ALWAYS_FALSE`	A permission function that always returns `Tristate.FALSE`.
`static PermissionFunction`	`ALWAYS_TRUE`	A permission function that always returns `Tristate.TRUE`.
`static PermissionFunction`	`ALWAYS_UNDEFINED`	A permission function that always returns `Tristate.UNDEFINED`.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type Method Description

Tristate getPermissionValue(String permission)
Gets the subjects setting for a particular permission.

- Field Detail
  - ALWAYS_TRUE
```
static final PermissionFunction ALWAYS_TRUE
```
    A permission function that always returns Tristate.TRUE.
  - ALWAYS_FALSE
```
static final PermissionFunction ALWAYS_FALSE
```
    A permission function that always returns Tristate.FALSE.
  - ALWAYS_UNDEFINED
```
static final PermissionFunction ALWAYS_UNDEFINED
```
    A permission function that always returns Tristate.UNDEFINED.
- Method Detail
  - getPermissionValue
```
Tristate getPermissionValue(String permission)
```
    Gets the subjects setting for a particular permission.
    
    Parameters:
    
    permission - the permission
    
    Returns:
    
    the value the permission is set to