org.apache.tapestry5.services
Interface ValidationConstraintGenerator

All Known Implementing Classes:

MessagesConstraintGenerator, PrimitiveFieldConstraintGenerator, ValidateAnnotationConstraintGenerator, ValidationConstraintGeneratorImpl

@UsesOrderedConfiguration(value=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.ioc.Messages, java.util.Locale).

Method Summary

List<String>

buildConstraints(Class propertyType, AnnotationProvider annotationProvider) For a given property, identify all the approprite validation constraints.

Method Detail

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 FieldValidators 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