[CAUSEWAY-1484] [Wish] Extend @Parameter, specify a class to obtain the default, choices, autoComplete.

• Type: Wish
• Status: Reopened
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 1.13.0
• Component/s: Applib (programming model)
• Assignee: Unassigned
• Reporter: Daniel Keir Haywood
• Created: 10/Sep/16 06:11
• Updated: 29/Apr/22 16:31

Description

public void updateName(
    @Parameter(defaultOf="Foo")  // if can specify an Object???
    @ParameterLayout(named = "New name")
    final String name) {

    setName(newName);
}

or a more elaborate (over-complicated?) design:

eg:

public void updateName(
    @Parameter(defaultFrom=ParameterDefaultFromProperty.class
    @ParameterLayout(named = "New name")
    final String name) {

    setName(newName);
}

where (part of the applib):

public interface ParameterDefaulter {
    Object defaultFor(Object domainObject, String actionName, String parameterName);
} 

and the applib also provides a default implementation:

public class ParameterDefaultFromProperty implements ParametedDefaulter { ... }

that uses an injected service (from core.runtime) to look up the parameter value from the corresponding property of the object.