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

Post by 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!
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[Luke Sandberg]

Injector.getBinding is probably the right method

Post by 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
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!
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[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.

Post by Luke Sandberg
Injector.getBinding is probably the right method

Post by 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
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!
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