Package ca.corbett.forms.validators

Class FileMustBeSpecifiedValidator

java.lang.Object
ca.corbett.forms.validators.FileMustBeSpecifiedValidator
All Implemented Interfaces:
FieldValidator<FileField>
public class FileMustBeSpecifiedValidator extends Object implements FieldValidator<FileField>
Similar to NonBlankFieldValidator for TextFields, this FieldValidator implementation insists that a FileField cannot contain a blank value. Note that this validation is in addition to the SelectionType for the FileField in question (e.g. if you specify ExistingFile and also add this FieldValidator, then a file must be specified AND exist. If you specify ExistingFile but don't add this FieldValidator, then the given file must only exist if one is specified... blank value will return null in that case).
Since:
2020-10-13
Author:
scorbo2

  • Constructor Details

    • FileMustBeSpecifiedValidator

      public FileMustBeSpecifiedValidator()

  • 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.