Dependency injection via Google Guice use case

Question

I have code that looks like the ff.:

Interface i; if (someCondition) { ImplementationA a = new ImplementationA(); a.setFieldA(someValueA); a.setFieldB(someValueB); i = a; } else { ImplementationB b = new ImplementationB(); b.setFieldC(someValueC); i = b; } // Do something with i.

My questions are:

Should I use dependency injection here or is this beyond the scope of the technique?
If I should use dependency injection here, how can I accomplish it using Google Guice?

Jan Galinski · Accepted Answer · 2012-07-19 17:49:17Z

dynamic runtime injection is out of scope. you will have to configure which implementation to use via Modules. You could still use a factory (have a look at multibindings and assisted injection) and save yourself the work to set up your instances though ...

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