On 10-Aug-09, at 1:32 PM, Jochen Wiedmann wrote:
Hi,
in a plugin, I'd like to select a component dynamically. Basically,
I'd like to have something along these lines:
<configuration>
<myComponent hint="foo">
...
</myComponent>
</configuration>
The idea is to use the hint for looking up the "myComponent" bean and
use the XML fragment between <myComponent> and <myComponent> to
configure the bean.
Is that possible? Any other ideas how to achieve my goal?
// Lookup you unconfigured component
//
Foo component = container.lookup( Foo.class, "myComponent" );
// Create a PlexusConfiguration to use against your component and
populate as necessary
// by adding elements and attributes. Use autocomplete in your IDE to
find out what's available.
PlexusConfiguration configuration = new
XmlPlexusConfiguration( "configuration" );
// Look up the default component configurator which is used internally
to configure component.
//
ComponentConfigurator configurator =
container.lookup( Configurator.class );
// I assume you're in a plugin so you'll need the classrealm of the
plugin itself
// which you can access through the mojoExecution using the $
{mojoExecution} expression
ClassRealm pluginRealm =
mojoExecution.getMojoDescriptor().getPluginDescriptor().getClassRealm();
// Use the configurator to configure the component
configurator.configureComponent( component, configuration,
pluginRealm );
You might want to make your own implementation of the
PlexusConfiguration if you're going to use another source other then
XML. Internally in Plexus the configuration can come from any source
but in Maven it's primarily XML but you're not restricted to XML.
Thanks,
Jochen
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Thanks,
Jason
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People develop abstractions by generalizing from concrete examples.
Every attempt to determine the correct abstraction on paper without
actually developing a running system is doomed to failure. No one
is that smart. A framework is a resuable design, so you develop it by
looking at the things it is supposed to be a design of. The more
examples
you look at, the more general your framework will be.
-- Ralph Johnson & Don Roberts, Patterns for Evolving Frameworks
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