Package com.sap.cds.ql.cqn

Interface CqnToken

All Superinterfaces:

JSONizable

All Known Subinterfaces:

BooleanFunction, BooleanValue, CqnArithmeticExpression, CqnArithmeticNegation, CqnBetweenPredicate, CqnBooleanLiteral, CqnCaseExpression, CqnComparisonPredicate, CqnConnectivePredicate, CqnContainmentTest, CqnElementRef, CqnEtagPredicate, CqnExistsSubquery, CqnExpand, CqnExpression, CqnFunc, CqnHierarchy, CqnHierarchyGenerator, CqnHierarchySubset, CqnInline, CqnInPredicate, CqnInSubquery, CqnJoin, CqnListValue, CqnLiteral<T>, CqnMatchPredicate, CqnNegation, CqnNullValue, CqnNumericLiteral<N>, CqnParameter, CqnPassThroughSearchPredicate, CqnPlain, CqnPredicate, CqnReference, CqnSearchPredicate, CqnSearchTermPredicate, CqnSelect, CqnSelectList, CqnSelectListItem, CqnSelectListValue, CqnSortSpecification, CqnSource, CqnStringLiteral, CqnStructuredLiteral, CqnStructuredTypeRef, CqnTableFunction, CqnTemporalLiteral<E>, CqnValue, CqnVector, CqnWindowFunc, ElementRef<T>, Expand<T>, FunctionCall<T>, Hierarchy, HierarchySubset, Literal<T>, NullValue, Parameter<T>, Predicate, SelectableValue, Source<T>, StructuredType<T>, StructuredTypeRef, TableFunction, Value<T>, WindowFunctionCall<T>

All Known Implementing Classes:

CqnStar, Select

public interface CqnToken
extends JSONizable

Method Summary

Modifier and Type	Method	Description
void	accept(CqnVisitor visitor)	Traverses the expression tree represented by this token with a given visitor.
default Stream<CqnToken>	tokens()

Methods inherited from interface com.sap.cds.JSONizable

toJson

Method Details

accept

void accept(CqnVisitor visitor)

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.

Parameters:

visitor - the CqnVisitor

tokens

@Beta
default Stream<CqnToken> tokens()