Implementation

The framework provides a single grid implementation, o.a.c.core.metamodel.services.grid.bootstrap.GridSystemServiceBootstrap, which supports Bootstrap3 (https://causeway.apache.org/applib/layout/grid/bootstrap3/bootstrap3.xsd).

A SPI is provided via nested interface FallbackLayoutDataSource, that allows to customize layout fallback behavior on a per class basis. (Without having to override the heavy weight GridSystemServiceBootstrap.)

FallbackLayoutDataSource SPI
interface FallbackLayoutDataSource {
    Try<String> tryLoadAsStringUtf8(Class<?> domainClass); (1)
}

  1. Provides custom default for given domainClass or return an Try.empty() if indifferent.

FallbackLayoutDataSource example
@Service
public class FallbackLayoutForManager implements FallbackLayoutDataSource {

    @Override
    public Try<String> tryLoadAsStringUtf8(final Class<?> domainClass) {
        return domainClass.getSimpleName().endsWith("Manager")
                ? DataSource.ofResource(getClass(), "ManagerLayout.xml") (1)
                    .tryReadAsStringUtf8()
                : Try.empty(); (2)
    }

}

  1. Provides a custom layout for all domain classes that have a name ending with 'Manager'.

  2. Indifferent for given domain type. Tells the framework to fall through.

(The framework also provides Web UI (Wicket viewer) components that are capable of interpreting and rendering this metadata.