Package com.sap.cds.ql.cqn

Interface CqnExpression

All Superinterfaces:
CqnToken, CqnValue, JSONizable
All Known Subinterfaces:
BooleanFunction, BooleanValue, CqnArithmeticExpression, CqnArithmeticNegation, CqnBetweenPredicate, CqnCaseExpression, CqnComparisonPredicate, CqnConnectivePredicate, CqnContainmentTest, CqnEtagPredicate, CqnExistsSubquery, CqnInPredicate, CqnInSubquery, CqnMatchPredicate, CqnNegation, CqnPassThroughSearchPredicate, CqnPredicate, CqnSearchPredicate, CqnSearchTermPredicate, Predicate
public interface CqnExpression extends CqnValue

  • Method Details

    • 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

    • isCaseExpression

      default boolean isCaseExpression()
      Returns true if this is a CqnCaseExpression.
      Returns:
      true if this is a case 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

    • asCaseExpression

      default CqnCaseExpression asCaseExpression()
      Casts this expression to a CqnCaseExpression.
      Returns:
      this as a case expression
      Throws:
      ClassCastException - if this expression is not a case 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