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https://issues.apache.org/jira/browse/ISIS-1484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Keir Haywood updated ISIS-1484:
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Component/s: Isis Core
> Extend @Parameter, specify a class to obtain the default
> --------------------------------------------------------
>
> Key: ISIS-1484
> URL: https://issues.apache.org/jira/browse/ISIS-1484
> Project: Isis
> Issue Type: New Feature
> Components: Isis Applib (programming model), Isis Core
> Affects Versions: 1.13.0
> Reporter: Daniel Keir Haywood
> Priority: Minor
>
> {code}
> public void updateName(
> @Parameter(defaultOf="Foo") // if can specify an Object???
> @ParameterLayout(named = "New name")
> final String name) {
> setName(newName);
> }
> {code}
> or a more elaborate (over-complicated?) design:
> eg:
> {code}
> public void updateName(
> @Parameter(defaultFrom=ParameterDefaultFromProperty.class
> @ParameterLayout(named = "New name")
> final String name) {
> setName(newName);
> }
> {code}
> where (part of the applib):
> {code}
> public interface ParameterDefaulter {
> Object defaultFor(Object domainObject, String actionName, String
> parameterName);
> }
> {code}
> and the applib also provides a default implementation:
> {code}
> public class ParameterDefaultFromProperty implements ParametedDefaulter { ...
> }
> {code}
> that uses an injected service (from core.runtime) to look up the parameter
> value from the corresponding property of the object.
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