[hibernate-issues] [Hibernate-JIRA] Created: (ANN-506) Request for Expression Language (EL) for Validator annotations

[Chris Hansen (JIRA)]

Request for Expression Language (EL) for Validator annotations
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         Key: ANN-506
         URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-506
     Project: Hibernate Annotations
        Type: New Feature

  Components: validator  
 Environment: All
    Reporter: Chris Hansen


Since annotations are limited to primitive types, I would like to see a type of EL for the Validator annotations (similar to the JSF/JSP EL). This would effectively overcome this limitation of annotations and allow for very powerful functionality, such as utilizing the natural ordering of classes. For example:

@Range(min="#{MyClass.MIN_OBJECT}", max="#{MyClass.MAX_OBJECT}") public MyClass getCurrent()

Assuming MIN_OBJECT and MAX_OBJECT are (static, final) instances of MyClass and MyClass implements Comparable<myClass>, the validator could compare the return value of the method with both MIN_OBJECT and MAX_OBJECT and validate that it is within the desired range.

This is just an example. I'm sure there are many more interesting uses possible because this is a powerful concept.

The regular functionality of the annotatinos could be preserved by treating static (non-EL) values, such as the string "0", as old-style primitives, e.g. @Min(value="0").


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