[jira] [Commented] (POLYGENE-179) Mechanism to declare Defaults factories

["Niclas Hedhman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/POLYGENE-179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16027857#comment-16027857 ] 

Niclas Hedhman commented on POLYGENE-179:
-----------------------------------------

NOTE: There is code about this going into 3.0 release, but it is not working and any attempt to use it is likely to fail.

Target this for 3.1 or more likely 3.2 or later

> Mechanism to declare Defaults factories
> ---------------------------------------
>
>                 Key: POLYGENE-179
>                 URL: https://issues.apache.org/jira/browse/POLYGENE-179
>             Project: Polygene
>          Issue Type: New Feature
>            Reporter: Niclas Hedhman
>            Assignee: Niclas Hedhman
>            Priority: Minor
>
> Currently, it is possible to declare a default value for properties during assembly.
> {code}
> module.forMixin( Abc.class ).declareDefaults().someProperty().set( 123 );
> {code}
> But there is no way to do this for Property declarations that take ValueComposites as their type, since the Runtime has not be activated yet.
> But if it was possible to declare a closure, which is capable of creating anything inside the Polygene runtime. Then we could do something like this;
> {code}
> public interface Abc
> {
>     Property<Address> address();
> }
> void assemble( ModuleAssembly module ) 
> {
>     module.forMixin( Abc.class ).declareInitialValueProvider( (module, propertyDescriptor) -> 
>     {
>         switch( propertyDescriptor.qualifiedName() )
>         {
>             case "Abc:address":
>                 ValueBuilder<Address> builder = module.valueBuilderFactory().newValueBuilder( Address.class );
>                 Address prototype = builder.prototype();
>                 prototype.city().set( "<not set>" );
>                 prototype.country().set( "<not set>" );
>                 prototype.zipcode().set( "<not set>" );
>                 prototype.line1().set( "<not set>" );
>                 prototype.line2.set( "<not set>" );
>                 return builder.newInstance();
>         }
>     });
> }
> {code}



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