Warn when certain constructor is used

[Maurizio Cimadamore]

Hi Pietro,
I believe the compiler tree API is what you want (I'm giving you JDK 7 
API links, since your link seems to be referring to JDK 7, but these API 
points are available in later releases as well, of course):

https://docs.oracle.com/javase/7/docs/jdk/api/javac/tree/index.html

More specifically, if you are writing an annotation processor, the 
compiler tree API allows you to retrieve a Tree objects for a given Element:

https://docs.oracle.com/javase/7/docs/jdk/api/javac/tree/com/sun/source/util/Trees.html

After which, you can define a visitor which detects the constructor 
calls you are interested in. For the visitor look here:

https://docs.oracle.com/javase/7/docs/jdk/api/javac/tree/com/sun/source/util/TreeScanner.html

there's a scan method for every tree node, I think you want to override 
visitNewClass:

https://docs.oracle.com/javase/7/docs/jdk/api/javac/tree/com/sun/source/util/TreeScanner.html#visitNewClass(com.sun.source.tree.NewClassTree,%20P)

As for generating diagnostics, you can do that by using the Messager 
interface which is part of the annotation processing API:

https://docs.oracle.com/javase/7/docs/api/javax/annotation/processing/Messager.html

you obtain one of these from the ProcessingEnvironment object you get at 
the start of anno processing - see

https://docs.oracle.com/javase/7/docs/api/javax/annotation/processing/Processor.html#init(javax.annotation.processing.ProcessingEnvironment)


I think these pointers should be enough to get started, feel free to 
reach out if you get stuck.

Maurizio


On 31/05/18 10:05, Pietro Paolini wrote:
> Hi all,
>
> I am not sure the question is appropriate for compiler-dev but I would like to give it a try anyway.
>
> I would like to detect when a certain class's constructor is used and log its usage along with filename and line number somewhere, such as a log file or standard output, I can't use an IDE to do that as I am working on a fairly large codebase and I need to automate the process, moreover it seems like an interesting problem to solve.
>
> https://docs.oracle.com/javase/7/docs/api/javax/tools/JavaCompiler.html
>
> I was hoping that could help me but I haven't spot anything as yet, even though I must admit that my knowledge on the matter is limited.
>
> Thanks,
> Pietro
>
>
> Pietro Paolini
> Consultant
>
> Alfa
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