Spring Boot - inject map<Enum,Class> from application.yml - initialization

Question

I use spring boot in a J2SE app.
I have some constant data, such as a map, indicating a HandlerClass to process one operation Type.
The map relation is not changed, so I want to config it in application.yml
I try this:
info:
modify_nodeip: omm.task.impl.ModifyNodeIpHandler
But the map is only can be recognized as Map<String,String>, How can I inject the map as Map<Enum,Class>?
Thank you!
Updated:
I followed #cfrick instruction, but it doen't work.
application.yml
config:
optHandlerMap:
modify_oms_nodeip: 'omm.task.opthandler.impl.ModifyOMSNodeIpHandler'
TestConfiguration:
#Configuration
#ConfigurationProperties(prefix = "config")
public class TestConfiguration
{
Map<OperationType,OptHandler> optHandlerMap; // here we store the handlers, same name in yaml
TestConfiguration() {}
}
and the main func used the configuration
#Autowired
private TestConfiguration testConfiguration;
what's wrong with that? But it doesn't work, optHandlerMap in testConfiguration is null.

Answer 1

You can play a trick like this:
In your TestConfiguration, define a Map<String,String>, and getter.
then provide a Map<Operator,Handler> getXXXX() function, in this function, convert the Map<String,String> to Map<Operator,Handler>.
Maybe you need to use reflect to new a instance.
By the way, you can use Maps.transform() in Guava to perform the conversion.

Answer 2

You write your own settings and annotate as #ConfigurationProperties (see 21.6 Typesafe Configuration Properties)
#Component
#ConfigurationProperties(prefix="cfg") // the root in my yaml
class HandlerConfiguration {
public enum Handler { Handler1, Handler2 } // enum
Map<Handler,Class> handlers // here we store the handlers, same name in yaml
HandlerConfiguration() {}
}
Then my application.yaml looks like this:
cfg:
handlers:
Handler1: 'app.Handler1'
And accessing it like this:
def ctx = SpringApplication.run(Application, args)
ctx.getBean(HandlerConfiguration).with{
assert handlers.size()==1 // there is the one
assert handlers[HandlerConfiguration.Handler.Handler1] // it's key is the enum
assert handlers[HandlerConfiguration.Handler.Handler1] == Handler1 // its value is the actual class
handlers[HandlerConfiguration.Handler.Handler1].newInstance().run()
}
(app.Handler1 is just some random class I put there, all this is in the same package (app))

Answer 3

just enable config spring.data.rest.enable-enum-translation (Spring document) and Spring will do the trick