org.javalid.core.validator
Interface JavalidValidator<T extends java.lang.annotation.Annotation>

All Known Implementing Classes:

BetweenLengthValidatorImpl, CollectionSizeValidatorImpl, DateCheckValidatorImpl, DbNumCheckValidatorImpl, LovConstraintValidatorImpl, MaxLengthValidatorImpl, MaxValueValidatorImpl, MinLengthValidatorImpl, MinValueValidatorImpl, NotEmptyValidatorImpl, NotNullValidatorImpl, RegularExpressionValidatorImpl, ValidateListValidatorImpl, ValidateMapValidatorImpl

public interface JavalidValidator<T extends java.lang.annotation.Annotation>

This interface is the contract for a class that performs validation for an annotation. For instance the annotation @NotNull has a NotNullValidatorImpl class, which is responsible for validating a method on the constraint not null.

You can define your own annotations and add a validator for them. Your choice of annotation is free (no restrictions). The validator class responsible for validating for that annotation however must implement this interface. Don't forget to register the annotation with its validator class in your own jv-config.xml file!

The framework first calls validationMustBeAppliedToGroup(Annotation annotation, String group) to determine if this validation must be applied or not. If true, then it calls validate(..)

The implementing class must have a default constructor and NOT use state information (as the classes are instantiated only once and then shared).

Since:

1.0

Version:

1.0

Author:

M.Reuvers

Method Summary

java.util.List<ValidationMessage>	validate(T annotation, java.lang.Object value, java.lang.String path, JvConfigurationWrapper config) This method is responsible for validating given value for the annotation this class is responsible for.
boolean	validationMustBeAppliedToGroup(T annotation, java.lang.String groupName, JvGroup jvGroup, JvConfigurationWrapper config) Implementors must return true if given groupName must indeed apply validation on its method.

Method Detail

validate

java.util.List<ValidationMessage> validate(T annotation,
                                           java.lang.Object value,
                                           java.lang.String path,
                                           JvConfigurationWrapper config)

This method is responsible for validating given value for the annotation this class is responsible for.

Parameters:

annotation - The annotation it is about

value - The value to validate

path - The framework gives the full path for this value you are validating, thus you can use it directly in the ValidationMessage as path.

config - Wrapper containing public configuration info (such as reflectionsupport, beanlookup, can be used if needed)

Returns:

List with ValidationMessage when validation fails, if no error return an EMPTY list (not NULL!!!)

validationMustBeAppliedToGroup

boolean validationMustBeAppliedToGroup(T annotation,
                                       java.lang.String groupName,
                                       JvGroup jvGroup,
                                       JvConfigurationWrapper config)

Implementors must return true if given groupName must indeed apply validation on its method. By default JV validation annotations have a property 'applyToGroups' where one can specify 1 or more groupnames if needed. Custom implementations may decide whether to adhere to that custom or use something else. If a custom annotation must always be applied for any group, simply return true.

Example: JvGroup (create,edit), groupName=create and the annotation in question has as groups {JvGroup.GROUP_APPLY_ALL}. This means the annotation supports ANY group that is defined for JvGroup, in this example JvGroup defines create and an edit group. As the annotation defines JV_GROUP_ALL and the requested group=create, it does exist in JvGroup and the annotation supports any group, thus true must be returend.

Another example: JvGroup(create,edit), groupName=edit, annotation={create}. Group requested is edit, this exists for JvGroup, yet the annotation defines only to validate for create. Thus false must be returned.

Last example: JvGroup(create,edit), groupName='delete', annotation={create,edit,delete}. The groupName requested (delete) does not exist in JvGroup and must be skipped always whatever the annotation says (delete group in annotation is useless as it is not part of the JvGroup).

Parameters:

annotation - The annotation it is about

groupName - The groupName, the groupName we wish to know about whether it is allowed or not (this is the group currently being validated).

jvGroup - the group to check in if requested groupName is indeed ok to be validated (it must exist in that array of groups)

config - Wrapper containing public configuration info (such as reflectionsupport, beanlookup, can be used if needed)

Returns:

True if for the groupname validation must be applied, false otherwise.