[jira] [Commented] (EXTCDI-175) introduce @ViewParam annotation for page beans

["Gerhard Petracek (JIRA)" <de...@myfaces.apache.org>]

    [ https://issues.apache.org/jira/browse/EXTCDI-175?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032571#comment-13032571 ] 

Gerhard Petracek commented on EXTCDI-175:
-----------------------------------------

that's more or less our original @RequestParameter idea.

'name' could be optional -> the name of the field is auto. the view-param.-name

we have to come up with a nice approach for converters. imo we will need custom meta-annotations which provide information for the converter.

e.g.

@RequestParam
@CustomDateConverter(pattern = "dd.MM.yyyy")
private Date date; 

@Target({TYPE, METHOD})
@Retention(RUNTIME)
@Documented

@CodiFacesConverter(CustomDateConverterImpl.class)
public @interface CustomDateConverter
{
    String pattern();
}

we don't need such an annotation for validators - we can use bv (if present)

> introduce @ViewParam annotation for page beans
> ----------------------------------------------
>
>                 Key: EXTCDI-175
>                 URL: https://issues.apache.org/jira/browse/EXTCDI-175
>             Project: MyFaces CODI
>          Issue Type: New Feature
>            Reporter: Mark Struberg
>
> When using the ViewConfig in CODI we not only get type safe navigation but also know the 'connection' between views and their backing beans. We already support annotations like @PreRenderView and likes for such beans. 
> We should also support the direct annotation of view parameters directly in the backing beans.
> instead of declaring the view parameters in the xhtml:
> <f:metadata>
>   <f:viewParam id="versionParam" name="version" value="#{backingbean.versionString}" required="false"/>
>   <f:viewParam id="searchString" name="s" value="#{backingbean.searchString}" required="false"/>
> </f:metadata>
> we can maybe use an annotation directly in the backing bean:
> @Named
> @RequestScoped
> public class Backingbean {
>   @ViewParam(required=false, name="version")
>   private String versionString;
>   @ViewParam(required=false, name="s")
>   private String searchString;
>   @PreRenderView
>   private void dosomeinit() {
>   ...
>   }
> }

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