CqnNullValue (cds4j:api 1.34.1 API)

All Superinterfaces:: CqnToken, CqnValue, JSONizable

public interface CqnNullValue
extends CqnValue

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`accept(CqnVisitor visitor)`	Traverses the expression tree represented by this token with a given `visitor`.
`default CqnNullValue`	`asNullValue()`	Casts this value to `CqnNullValue`.
`default boolean`	`isNullValue()`	Returns `true` if this is a `CqnNullValue`.

Methods inherited from interface com.sap.cds.ql.cqn.CqnToken
tokens

Methods inherited from interface com.sap.cds.ql.cqn.CqnValue
as, asExpression, asFunction, asList, asLiteral, asParameter, asPlain, asRef, isExpression, isFunction, isList, isLiteral, isParameter, isPlain, isRef, ofRef, type

Methods inherited from interface com.sap.cds.JSONizable
toJson

- Method Detail
  - isNullValue
```
default boolean isNullValue()
```
    Description copied from interface: CqnValue
    
    Returns true if this is a CqnNullValue.
    
    Specified by:
    
    isNullValue in interface CqnValue
    
    Returns:
    
    true if this is a null value, otherwise false
  - asNullValue
```
default CqnNullValue asNullValue()
```
    Description copied from interface: CqnValue
    
    Casts this value to CqnNullValue.
    
    Specified by:
    
    asNullValue in interface CqnValue
    
    Returns:
    
    this value as a null value
  - accept
```
void accept(CqnVisitor visitor)
```
    Description copied from interface: CqnToken
    
    Traverses the expression tree represented by this token with a given visitor. The traversal order is depth-first. If this token has child nodes they are traversed first by dispatching the visitor to the children's accept methods. Afterwards this token is passed to the visitor's visit method specific for this token's type.
    
    Specified by:
    
    accept in interface CqnToken
    
    Parameters:
    
    visitor - the CqnVisitor