Package com.sap.cds.ql.cqn

Interface CqnCaseExpression

All Superinterfaces:

CqnExpression, CqnToken, CqnValue, JSONizable

public interface CqnCaseExpression
extends CqnExpression

A case expression, which represents IF - THEN - ELSE logic. The result value is determined by evaluating a list of cases. If a CqnCaseExpression.Case.condition() of a case evaluates to TRUE the result value of the case is returned. If no condition of any case evaluates to TRUE the default value is returned.

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	CqnCaseExpression.Case	A case, which relates a condition to a result value.

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 CqnCaseExpression	asCaseExpression()	Casts this expression to a CqnCaseExpression.
List<CqnCaseExpression.Case>	cases()	The cases, which are evaluated.
CqnValue	defaultValue()	The default value, which is returned if no condition of any case matches
default boolean	isCaseExpression()	Returns true if this is a CqnCaseExpression.

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

asArithmeticExpression, asExpression, asNegation, asPredicate, isArithmeticExpression, isExpression, isNegation, isPredicate, 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, ofLiteral, ofRef, type

Method Details

cases

List<CqnCaseExpression.Case> cases()

The cases, which are evaluated.

Returns:

the cases

defaultValue

CqnValue defaultValue()

The default value, which is returned if no condition of any case matches

Returns:

the default value

isCaseExpression

default boolean isCaseExpression()

Description copied from interface: CqnExpression

Returns true if this is a CqnCaseExpression.

Specified by:

isCaseExpression in interface CqnExpression

Returns:

true if this is a case expression, otherwise false

asCaseExpression

default CqnCaseExpression asCaseExpression()

Description copied from interface: CqnExpression

Casts this expression to a CqnCaseExpression.

Specified by:

asCaseExpression in interface CqnExpression

Returns:

this as a case expression

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 CqnExpression

Specified by:

accept in interface CqnToken

Parameters:

visitor - the CqnVisitor