[jira] [Commented] (ISIS-478) Provide conditional choices, defaults and validation between action parameters

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ISIS-478?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762371#comment-13762371 ] 

ASF subversion and git services commented on ISIS-478:
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Commit ad6b896faf60278156880feefca5a687f69d1d7c in branch refs/heads/master from [~danhaywood]
[ https://git-wip-us.apache.org/repos/asf?p=isis.git;h=ad6b896 ]

ISIS-478: fixing null pointer exception in EntityLinkSimplePanel

... happens when attempt to edit an object that has a colleciton of objects within

                
> Provide conditional choices, defaults and validation between action parameters
> ------------------------------------------------------------------------------
>
>                 Key: ISIS-478
>                 URL: https://issues.apache.org/jira/browse/ISIS-478
>             Project: Isis
>          Issue Type: New Feature
>          Components: Core, Viewer: Wicket
>    Affects Versions: viewer-wicket-1.2.0, core-1.2.0
>            Reporter: Dan Haywood
>            Assignee: Dan Haywood
>             Fix For: viewer-wicket-1.3.0, core-1.3.0
>
>
> For example, suppose there is an action to specify an address, where we specify the country, the state and the postcode.  We want the state to have choices and a default dependent on the country, and we want the postcode to be validated according to the rules of that country.
> public Address enterAddress(Country c, State st, @Named("Postcode") String postcode) { ... }
> Any dependent parameter must supply a param-specific validate [this is a new method prefix]:
> public String validate1EnterAddress(Country c, State st, String postcode) {  ... }
> public String validate2EnterAddress(Country c, State st, String postcode) {  ... }
> The choices and defaults for State also accept all param types preceding:
> public List<State> choices1EnterAddress(Country c) { ... }
> public State default1EnterAddress(Country c) { ... }
> When the user enters a value for the country, this is passed to these methods.  If the user tabs directly to the State param without entering the country, then these would return empty lists/value.
> If the user enters a value for the country, then corresponding entries for the state and postcode, and then tabs back to the country and enters a different value, then the validateNXxx methods are called (for all N > 0, country being param 0).  If the validate methods indicate their current value is invalid, then the values are set to null or to the recomputed default (if a default method is available).

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