Package ca.corbett.forms.validators

Class FileMustNotExistValidator

java.lang.Object
ca.corbett.forms.validators.FileMustNotExistValidator
All Implemented Interfaces:
FieldValidator<FileField>
public class FileMustNotExistValidator extends Object implements FieldValidator<FileField>
The opposite of FileMustExistValidator, this one ensures that the selected file or directory does not already exist (such as for a save dialog).
Since:
2019-11-24
Author:
scorbo2

  • Constructor Details

    • FileMustNotExistValidator

      public FileMustNotExistValidator()

  • Method Details

    • validate

      public ValidationResult validate(FileField fieldToValidate)
      Description copied from interface: FieldValidator
      Performs validation on the field in question, and returns a ValidationResult as appropriate. Here you can do whatever checks you need to do, either on the FormField in question, or on other FormFields on the same FormPanel if you have references to them, or to whatever other state your application maintains. If you wish to signal a validation error, it's highly recommended to make sure you give some clue as to what the user can do to fix the problem.

      An example of bad validation:

      return new ValidationResult(false, "Something bad happened.");

      An example of good validation:

      return new ValidationResult(false, "Value must be less than 10.");
      Specified by:
      validate in interface FieldValidator<FileField>
      Parameters:
      fieldToValidate - The FormField to be validated.
      Returns:
      A ValidationResult which describes whether the current value in our field is valid.