[hibernate-issues] [Hibernate-JIRA] Commented: (BVAL-36) Validation of method parameters and returned values

[Hardy Ferentschik (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/BVAL-36?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31411#action_31411 ] 

Hardy Ferentschik commented on BVAL-36:
---------------------------------------

Is the aim to make Bean Validation some sort of Design by Contract (DbC) framework similar to iContract, jContractor or Contract4J? The latter also being based on annotations.  How would the annotations look like for method contraints? Would you introduce the pre/post condition annotation into Bean Validation? 

I am not sure whether this belongs into Bean Validation?

> Validation of method parameters and returned values
> ---------------------------------------------------
>
>                 Key: BVAL-36
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/BVAL-36
>             Project: Bean Validation
>          Issue Type: New Feature
>          Components: spec-general
>            Reporter: Emmanuel Bernard
>            Assignee: Emmanuel Bernard
>
> The goal is to expose the necessary APIs to validate method parameters and returned type. This API can typically be used by an interceptor framework.
> Validator {
>     List<IC> validateParameters(Method, Object[] parameterValues);
>     List<IC> validateParameter(Method, Object parameterValue, int parameterIndex);
>     List<IC> validateReturnedValue(Method, Object returnedValue);
>     List<IC> validateParameters(Constructor, Object[] parameterValues);
>     List<IC> validateParameter(Constructor, Object parameterValue, int parameterIndex);
> }
> Metadata
> Validator {
>     BeanDescriptor getConstraintsForBean()
>     PropertyDescriptor getConstraintsForProperty(String propertyName);
>     MethodDescriptor getConstraintsForMethod(Method);
>     MethodDescriptor getConstraintsForConstructor(Constructor);
>     String[] getValidatedProperties();
>     Method[] getValidatedMethods();
>     Constructor[] getValidatedConstructors();
> }
> ElementDescriptor {
>     ElementType getElementType();
>     Class getType();
>     List<ConstraintDescriptor> getConstraintDescriptors();
> }
> PropertyDescriptor extends ElementDescriptor {
>     boolean isCascaded();
>     String getPropertyPath();
> }
> ParameterDescriptor extends ElementDescriptor {
>     boolean isCascaded();
>     int getIndex();
> }
> BeanDescriptor extends ElementDescriptor {
> }
> MethodDescriptor extends ElementDescriptor {
>     List<ParameterDescriptor> getParameterDescriptors(); //index aligned
>     boolean isCascaded();
> }
> ConstructorDescriptor extends ElementDescriptor {
>     List<ParameterDescriptor> getParameterDescriptors(); //index aligned
> }
> How to read parameter annotations
> Class<?> parameterTypes = method.getParameterTypes()
> Annotation[][] parameterAnnotations = method.getParameterAnnotations()

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