[hibernate-issues] [Hibernate-JIRA] Commented: (HV-292) Provide a constraint annotation @ScriptAssert

Provide a constraint annotation @ScriptAssert --------------------------------------------- Key: HV-292 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-292 Project: Hibernate Validator Issue Type: New Feature Components: validators Affects Versions: 4.1.0.Beta1 Reporter: Gunnar Morling Assignee: Hardy Ferentschik Fix For: 4.1.0 Attachments: HV-292-doc.diff, HV-292.diff Quite often the validation of one bean property depends on the value of another property of the same bean. In such case a custom class-level constraint and a corresponding validator have to be implemented. This effort can be reduced by providing a generic class-level constraint, which allows to evaluate arbitrary script expressions based on the annotated class as in the following example: @ScriptAssert(lang = "groovy", script = "_this.startDate.before(_this.endDate)") public class CalendarEvent { private Date startDate; private Date endDate; //... } The blog post http://musingsofaprogrammingaddict.blogspot.com/2009/08/script-annotation... describes, how such a constraint could be realized using the JSR 223 ("Scripting for the Java Platform") API. In alternative to solely rely on JSR 223 it should be investigated, whether a more general approach could be taken to enable the integration of scripting/expression languages, for which no JSR 223 binding exists (e.g. Spring EL). This could be realized by providing a SPI mechanism, which allows to plug-in additional script engine providers.