Dears,
In the scope of a game, I would like to generate random areas on the fly,
based upon some parameters and a specific type.
The parameters depend on the area that I want to build.
The thing is that there are several types of providers (or generators). One
per string identifier.
For the moment, I have the following in my module:
for (...) {
String areaType = ...;
Properties areaParameters = ...;
String areaId = ...;
Provider<Area> provider;
if ("type1".equals(areaType)) {
provider = new Type1AreaProvider(areaParameters);
} else if ("type2".equals(areaType)) {
provider = new Type2AreaProvider(areaParameters);
} else if ... // Dozen of types
Areas.bindArea(binder(), areaId).toProvider(provider);
}
I would like to refactor this in a named FactoryProvider of Provider so my
code looks like this (using an interface AreaProviderFactory):
// Areas.bind... uses the ProviderFactory internally.
Areas.bindAreaProviderFactory(binder(), "type1", Type1AreaProvider.class);
Areas.bindAreaProviderFactory(binder(), "type2", Type2AreaProvider.class);
...
// Somehow retrieve a fully injected areaProviderFactories
Xxxx areaProviderFactories = ...;
for (...) {
String areaType = ...;
Properties areaParameters = ...;
String areaId = ...;
Provider<Area> provider =
areaProviderFactories.get(areaType).create(areaParameters);
Areas.bindArea(binder(), areaId).toProvider(provider);
}
The questions are:
* How to get the areaProviderFactories (being a map, an injector or
whatever) generated already inside my Module (or using just a Binder if I
want to get it in a static helper method)? I've thought about a
method-private class with "@Inject Map<String,AreaProviderFactory>
factories;" and a call to requestInjection() on an instance of that class
but I find this ugly; if I want to use the static helper, that means I have
to inject this for every call, which I would rather avoid.
* What is the best to create/get these factories in this scope: using a
MapBinder or the Injector+Named annotation?
I'm still using Guice 2.0 for this project. Is there any way Guice 3.0 helps
me better?
Thank you very much,
Olivier
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