[jira] [Resolved] (ISIS-488) Derive Isis' MandatoryFacet from JDO @Column(allowNulls=) annotation, and provide @Mandatory annotation as override

["Dan Haywood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ISIS-488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Haywood resolved ISIS-488.
------------------------------

    Resolution: Fixed
    
> Derive Isis' MandatoryFacet from JDO @Column(allowNulls=) annotation, and provide @Mandatory annotation as override
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: ISIS-488
>                 URL: https://issues.apache.org/jira/browse/ISIS-488
>             Project: Isis
>          Issue Type: New Feature
>          Components: Objectstore: JDO
>    Affects Versions: objectstore-jdo-1.1.0
>            Reporter: Dan Haywood
>            Assignee: Dan Haywood
>            Priority: Minor
>             Fix For: objectstore-jdo-1.2.0
>
>
> Thus:
> @javax.jdo.annotations.Column(allowNulls="false")
> public String getFoo() { ... }
> is mandatory
> @javax.jdo.annotations.Column(allowNulls="true")
> public String getFoo() { ... }
> is optional
> @javax.jdo.annotations.Column
> public int getFoo() { ... }
> is mandatory (JDO default for primitives)
> @javax.jdo.annotations.Column
> public String getFoo() { ... }
> is optional (JDO default for non-primitives)
> ~~~
> In certain circumstances (when using roll-up SUPERCLASS_TABLE inheritance) it is necessary to annotate a mandatory property as optional in JDO.  To force Isis to implement a mandatory check, use the @Mandatory annotation
> eg:
> @javax.jdo.annotations.Inheritance(strategy = InheritanceStrategy.SUPERCLASS_TABLE)
> public class SomeSubclass {
>     @javax.jdo.annotations.Column(allowNulls="false")
>     @Mandatory
>     public String getFoo() { ... }

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