public interface CqnNullValue extends CqnValue
Modifier and Type | Method and 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 . |
as, asExpression, asFunction, asList, asLiteral, asParameter, asPlain, asRef, isExpression, isFunction, isList, isLiteral, isParameter, isPlain, isRef, ofRef, type
toJson
default boolean isNullValue()
CqnValue
true
if this is a CqnNullValue
.isNullValue
in interface CqnValue
true
if this is a null value, otherwise false
default CqnNullValue asNullValue()
CqnValue
CqnNullValue
.asNullValue
in interface CqnValue
void accept(CqnVisitor visitor)
CqnToken
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.accept
in interface CqnToken
visitor
- the CqnVisitor
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