[hibernate-issues] [Hibernate-JIRA] Created: (BVAL-224) Provide a way for accessing default implementations for XML configured bootstrap artifacts

[Gunnar Morling (JIRA)]

Provide a way for accessing default implementations for XML configured bootstrap artifacts
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                 Key: BVAL-224
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/BVAL-224
             Project: Bean Validation
          Issue Type: New Feature
          Components: spec-general
            Reporter: Gunnar Morling


Using {{validation.xml}} one can specify custom implementations for constraint validator factory, message interpolator etc. Right now there is no way to delegate from within these custom implementations to the default ones. This would be possible when using the configuration API:

{code}
HibernateValidatorConfiguration configuration = Validation.byProvider(HibernateValidator.class).configure();
ConstraintValidatorFactory defaultFactory = configuration.getDefaultConstraintValidatorFactory();
ConstraintValidatorFactory customFactory = new CustomConstraintValidatorFactory(defaultFactory);
configuration.constraintValidatorFactory(customFactory);
{code}

One idea to allow for such a delegation is to support constructors taking the default implementation as parameter:


{code}
CustomConstraintValidatorFactory implements ConstraintValidatorFactory {

    ConstraintValidatorFactory delegate;

    CustomConstraintValidatorFactory(ConstraintValidatorFactory defaultFactory) {
        this.delegate = defaultFactory;
    }

} 
{code}

For XML-configured artifacts the runtime could invoke this delegate constructor if existent, otherwise the default constructor could be invoked.

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