Package mondrian.olap

Interface Validator

public interface Validator
Provides context necessary to resolve identifiers to objects, function calls to specific functions.

An expression calls validate(mondrian.olap.Exp, boolean) on each of its children, which in turn calls Exp.accept(mondrian.olap.Validator).

Author:
jhyde

  • Method Details

    • getQuery

      Query getQuery()
      Returns the Query which is being validated.

    • validate

      Exp validate(Exp exp, boolean scalar)
      Validates an expression, and returns the expression it resolves to.
      Parameters:
      exp - Expression to validate
      scalar - Whether the context requires that the expression is evaluated to a value, as opposed to a tuple

    • validate

      void validate(ParameterExpr parameterExpr)
      Validates a usage of a parameter.

      It must resolve to the same object (although sub-objects may change).

    • validate

      void validate(MemberProperty memberProperty)
      Validates a child member property.

      It must resolve to the same object (although sub-objects may change).

    • validate

      void validate(QueryAxis axis)
      Validates an axis. It must resolve to the same object (although sub-objects may change).

    • validate

      void validate(Formula formula)
      Validates a formula. It must resolve to the same object (although sub-objects may change).

    • requiresExpression

      boolean requiresExpression()
      Returns whether the current context requires an expression.

    • canConvert

      boolean canConvert(int ordinal, Exp fromExp, int to, List<Resolver.Conversion> conversions)
      Returns whether we can convert an argument to a parameter type.
      Parameters:
      ordinal - argument ordinal
      fromExp - argument type
      to - parameter type
      conversions - List of conversions performed; method adds an element for each non-trivial conversion (for example, converting a member to a level).
      Returns:
      Whether we can convert an argument to a parameter type

    • getFunTable

      FunTable getFunTable()
      Returns the table of function and operator definitions.

    • createOrLookupParam

      Parameter createOrLookupParam(boolean definition, String name, Type type, Exp defaultExp, String description)
      Creates or retrieves the parameter corresponding to a "Parameter" or "ParamRef" function call.

    • getDef

      FunDef getDef(Exp[] args, String name, Syntax syntax)
      Resolves a function call to a particular function. If the function is overloaded, returns as precise a match to the argument types as possible.

    • alwaysResolveFunDef

      boolean alwaysResolveFunDef()
      Whether to resolve function name and arguments to a function definition each time a node is validated, not just the first time.

      Default implementation returns false.

      Returns:
      whether to resolve function each time

    • getSchemaReader

      SchemaReader getSchemaReader()
      Returns the schema reader with which to resolve names of MDX objects (dimensions, hierarchies, levels, members, named sets).

      The schema reader is initially in the context of the query's cube, and during a traversal it may change if named sets are introduced using the 'expr AS alias' construct.

      Returns:
      Schema reader