NoValue (Apache Jena)

java.lang.Object
- org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
- - org.apache.jena.reasoner.rulesys.builtins.NoValue

All Implemented Interfaces:

Builtin
```
public class NoValue
extends BaseBuiltin
```
Can be used in two arg form (X, P) or three arg form (X, P, V). In three arg form it succeeds if the triple (X, P, V) is not currently present, in two arg form it succeeds if there is not value for (X, P, *).

Field Summary
- Fields inherited from class org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
  BASE_URI

Constructor Summary

Constructors
Constructor Description

NoValue()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`bodyCall(Node[] args, int length, RuleContext context)`	This method is invoked when the builtin is called in a rule body.
`java.lang.String`	`getName()`	Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.
`boolean`	`isMonotonic()`	Flag as non-monotonic so the guard clause will get rerun after deferal as part of a non-trivial conflict set.

Methods inherited from class org.apache.jena.reasoner.rulesys.builtins.BaseBuiltin
checkArgs, getArg, getArgLength, getURI, headAction, isSafe

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - NoValue
```
public NoValue()
```
- Method Detail
  - getName
```
public java.lang.String getName()
```
    Return a name for this builtin, normally this will be the name of the functor that will be used to invoke it.
  - bodyCall
```
public boolean bodyCall(Node[] args,
                        int length,
                        RuleContext context)
```
    This method is invoked when the builtin is called in a rule body.
    
    Specified by:
    
    bodyCall in interface Builtin
    
    Overrides:
    
    bodyCall in class BaseBuiltin
    
    Parameters:
    
    args - the array of argument values for the builtin, this is an array of Nodes, some of which may be Node_RuleVariables.
    
    length - the length of the argument list, may be less than the length of the args array for some rule engines
    
    context - an execution context giving access to other relevant data
    
    Returns:
    
    return true if the buildin predicate is deemed to have succeeded in the current environment
  - isMonotonic
```
public boolean isMonotonic()
```
    Flag as non-monotonic so the guard clause will get rerun after deferal as part of a non-trivial conflict set.
    
    Specified by:
    
    isMonotonic in interface Builtin
    
    Overrides:
    
    isMonotonic in class BaseBuiltin