Can I Inject x Class?

[Joe DeSantis]

I was working with a JUnit 5 extension for Guice, and we had the need to determine if a particular class was able to be injected by an injector.

The only solution we came up with is attempting to get an instance with that Injector. (Literally calling the getInstance method, in a try/catch block).

So my question is simply, what is the best way of determining if you can get an instance of a particular class given an injector.

The discussion on the implementation is here for anyone who is curious,

https://github.com/JeffreyFalgout/junit5-extensions/commit/adf2f4ece977e834ba9b4f1563ebc568784ad3a4#commitcomment-29425765

Thanks!

[Stephan Classen]

Jukito takes another approach. They use an ElementVisitor to collect all bindings and then decide if the required binding is in the module(s).
Have a look at the BindingsCollector.java class

https://github.com/ArcBees/Jukito/blob/master/jukito/src/main/java/org/jukito/BindingsCollector.java

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[Luke Sandberg]

Injector.getBinding is probably the right method

To view this discussion on the web visit https://groups.google.com/d/msgid/google-guice/c98854df-a81a-7053-c32a-692dde254fc9%40gmx.ch.

[Joe DeSantis]

The method that was used prior was: injector.getExistingBinding(key)).isPresent()

It did accurately identify all explicit bindings, however it did not work with just-in-time bindings.