Package com.sap.cds.ql.cqn

Interface CqnNullValue

All Superinterfaces:

CqnToken, CqnValue, JSONizable

All Known Subinterfaces:

NullValue

public interface CqnNullValue
extends CqnValue

Method Summary

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, ofLiteral, ofRef, type

Methods inherited from interface com.sap.cds.JSONizable

toJson

Method Details

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