Package com.sap.cds.ql.cqn

Interface CqnExpression

All Superinterfaces:

CqnToken, CqnValue, JSONizable

All Known Subinterfaces:

BooleanFunction, CqnArithmeticExpression, CqnArithmeticNegation, CqnComparisonPredicate, CqnConnectivePredicate, CqnContainmentTest, CqnExistsSubquery, CqnInPredicate, CqnMatchPredicate, CqnNegation, CqnPredicate, CqnSearchPredicate, Predicate

public interface CqnExpression
extends CqnValue

Method Summary

Modifier and Type	Method	Description
default void	accept(CqnVisitor visitor)	Traverses the expression tree represented by this token with a given visitor.
default CqnArithmeticExpression	asArithmeticExpression()	Casts this expression to a CqnArithmeticExpression.
default CqnExpression	asExpression()	Casts this value to CqnExpression.
default CqnArithmeticNegation	asNegation()	Casts this expression to a CqnArithmeticNegation.
default CqnPredicate	asPredicate()	Casts this expression to a CqnPredicate.
default boolean	isArithmeticExpression()	Returns true if this is a CqnArithmeticExpression.
default boolean	isExpression()	Returns true if this is a CqnExpression.
default boolean	isNegation()	Returns true if this is a CqnArithmeticNegation.
default boolean	isPredicate()	Returns true if this is a CqnPredicate.
default String	toJson()

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

tokens

Methods inherited from interface com.sap.cds.ql.cqn.CqnValue

as, asFunction, asList, asLiteral, asNullValue, asParameter, asPlain, asRef, isFunction, isList, isLiteral, isNullValue, isParameter, isPlain, isRef, ofRef, type

Method Detail

isExpression

default boolean isExpression()

Description copied from interface: CqnValue

Returns true if this is a CqnExpression.

Specified by:

isExpression in interface CqnValue

Returns:

true if this is an expression, otherwise false

asExpression

default CqnExpression asExpression()

Description copied from interface: CqnValue

Casts this value to CqnExpression.

Specified by:

asExpression in interface CqnValue

Returns:

this value as an expression

isArithmeticExpression

default boolean isArithmeticExpression()

Returns true if this is a CqnArithmeticExpression.

Returns:

true if this is an arithmetic expression, otherwise false

asArithmeticExpression

default CqnArithmeticExpression asArithmeticExpression()

Casts this expression to a CqnArithmeticExpression.

Returns:

this as an arithmetic expression

Throws:

ClassCastException - if this expression is not an arithmetic expression

isNegation

default boolean isNegation()

Returns true if this is a CqnArithmeticNegation.

Returns:

true if this is a negation expression, otherwise false

asNegation

default CqnArithmeticNegation asNegation()

Casts this expression to a CqnArithmeticNegation.

Returns:

this as a negation expression

Throws:

ClassCastException - if this expression is not an arithmetic negation

isPredicate

default boolean isPredicate()

Returns true if this is a CqnPredicate.

Returns:

true if this is a predicate, otherwise false

asPredicate

default CqnPredicate asPredicate()

Casts this expression to a CqnPredicate.

Returns:

this as a predicate

Throws:

ClassCastException - if this expression is not a predicate

toJson

default String toJson()

Specified by:

toJson in interface JSONizable

accept

default 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