WhereValidator

Instance Methods

Empty constructor that creates an instance of the WhereValidator.

constructor

WhereValidator()

Scans all objects of the WhereExpression tree for errors, using the Visit method of the parent WhereVisitor class.

method validate(anExpression: WhereExpression; allowedFieldNames: array of String; anErrors: ReferenceType<String>): Integer

Integer validate(WhereExpression anExpression, String[] allowedFieldNames, ReferenceType<String> anErrors)

Parameters:

• anExpression: The instance of where expression that is to be validate.
• allowedFieldNames: The array of allowed field names for the given expression.
• anErrors: The reference paramether whose value holds validatoin errors, if they were found during validation.

method visit(expression: WhereExpression): WhereExpression

WhereExpression visit(WhereExpression expression)

Parameters:

• expression:

Defines the base rule of traversal for BetweenExpression. First, it visits Expression, then Lower Expression and finally Upper Expression. If parts of BetweenExpression were changed during visits, a new BetweenExpression, containing the new parts, will be obtained as a result.

method visitBetween(anExpression: BetweenExpression): WhereExpression

WhereExpression visitBetween(BetweenExpression anExpression)

Parameters:

• anExpression: The given between expresion to visit.

Defines the base rule of traversal for BinaryExpression. First, it visits Left Expression, then Right Expression. If parts of BinaryExpression were changed during visits, a new BinaryExpression, containing the new parts, will be obtained.

method visitBinary(anExpression: BinaryExpression): WhereExpression

WhereExpression visitBinary(BinaryExpression anExpression)

Parameters:

• anExpression: The given binaryexpresion to visit.

Defines the base rule of traversal for ConstantExpressions. Since ConstantExpressions can't consist of other expressions (it's the final object in the WhereExpression tree), this method returns the given ConstantExpression.

method visitConstant(anExpression: ConstantExpression): WhereExpression

WhereExpression visitConstant(ConstantExpression anExpression)

Parameters:

• anExpression: The given constant expresion to visit.

method visitDateTimeNow(expression: DateTimeNowExpression): WhereExpression

WhereExpression visitDateTimeNow(DateTimeNowExpression expression)

Parameters:

• expression:

method visitDateTimePart(expression: DateTimePartExpression): WhereExpression

WhereExpression visitDateTimePart(DateTimePartExpression expression)

Parameters:

• expression:

method visitDateTimeToday(expression: DateTimeTodayExpression): WhereExpression

WhereExpression visitDateTimeToday(DateTimeTodayExpression expression)

Parameters:

• expression:

Overloaded method that will be called for each FieldExpression contained in the test WhereExpression. It validates that the FieldExpression.FieldName is one of the allowedFieldNames given through the Validate method. Otherwise it adds an error message to the error list, which will be returned as refference parameter of the Validate method.

method visitField(anExpression: FieldExpression): WhereExpression

WhereExpression visitField(FieldExpression anExpression)

Parameters:

• anExpression: The field expression to be validated.

method visitFunctionCall(expression: FunctionCallExpression): WhereExpression

WhereExpression visitFunctionCall(FunctionCallExpression expression)

Parameters:

• expression:

Defines the base rule of traversal for ListExpressions. This method goes through the list and visits every expression on it. If at least one expression on the list was changed during the visit, a new ListExpression, containing the changed items, will be obtained as a result.

method visitList(anExpression: ListExpression): WhereExpression

WhereExpression visitList(ListExpression anExpression)

Parameters:

• anExpression: The given list expresion to visit.

Defines the base rule of traversal for MacroExpressions. This method goes through the items list and visits every expression on it. If at least one expression on the list was changed during the visit, a new MacroExpression, containing the changed items, will be obtained as a result.

method visitMacro(anExpression: MacroExpression): WhereExpression

WhereExpression visitMacro(MacroExpression anExpression)

Parameters:

• anExpression: The given macro expresion to visit.

Defines the base rule of traversal for NullExpressions. Since NullExpression can't consist of other expressions, this method returns the given expression.

method visitNull(anExpression: NullExpression): WhereExpression

WhereExpression visitNull(NullExpression anExpression)

Parameters:

• anExpression: The given null expresion to visit.

Defines the base rule of traversal for ParameterExpressions. Since ParameterExpression can't consist of other expressions (it's the final object in the WhereExpression tree), this method returns the given ParameterExpression.

method visitParameter(anExpression: ParameterExpression): WhereExpression

WhereExpression visitParameter(ParameterExpression anExpression)

Parameters:

• anExpression: The given parameter expresion to visit.

Overloaded method that will be called for each UnaryExpression contained in the test WhereExpression. It checks if the UnaryExpression.Expression is a BinaryExpression, otherwise it adds an error message to the error list, which will be returned as out parameter of the Validate method.

method visitUnary(anExpression: UnaryExpression): WhereExpression

WhereExpression visitUnary(UnaryExpression anExpression)

Parameters:

• anExpression: The unary expression to be validated.

WhereVisitor