Package org.apache.tapestry5.services

# Interface ValidationConstraintGenerator

All Known Implementing Classes:
  `MessagesConstraintGenerator`, `PrimitiveFieldConstraintGenerator`, `ValidateAnnotationConstraintGenerator`, `ValidationConstraintGeneratorImpl`

@UsesOrderedConfiguration(ValidationConstraintGenerator.class) public interface ValidationConstraintGenerator
Invoked to generate a list of validation constraint strings for a property. This typically involves scanning the property for annotations or naming conventions that confer the desired validation. The constraint strings are ultimately handed to `FieldValidatorSource.createValidator(org.apache.tapestry5.Field, String, String, String, org.apache.tapestry5.commons.Messages, java.util.Locale)`.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `List<String>`
  `buildConstraints(Class<?> propertyType, AnnotationProvider annotationProvider)`
  For a given property, identify all the approprite validation constraints.

- ## Method Details

  - ### buildConstraints

    List<String> buildConstraints(Class<?> propertyType, AnnotationProvider annotationProvider)
    For a given property, identify all the approprite validation constraints. Each returned value is the name of a validator (i.e., "required") or a validator name and configuration (i.e., "minlength=5"). These contraints are exactly the individual terms in a `validate specification`. These will ultimately be used to create `FieldValidator`s for the field that edits the property.
    Parameters:
      `propertyType` - the type of the property for which constraints are needed
      `annotationProvider` - provides access to any annotations concerning the property (for implementations that are based on analysis of property annotations)
    Returns:
      a list of constraints
    See Also:
      - `FieldValidatorSource`