Find out what packages, classes and methods the Jar file contains
I have a Java code editor with syntax highlighting, with a code hint menu and quick actions. The editor is written in C#. Once again, this editor is for editing Java code! I need to know what packages, classes, methods are in the Jar library (Jar file) for further code hinting and syntax highlighting.
I have an idea about decompiling the Jar to find out "its contents", but I suspect that there is another more efficient way to implement this.
This is what my editor looks like: 
It turned out to be relatively simple. I found the 'jd-gui' repository (https://github.com/java-decompiler/jd-gui), here is the app: (http://java-decompiler.github.io/). The program itself is written in java and is a very good java decompiler based on the jd-core core (https://github.com/java-decompiler/jd-core).
I liked this application, because. it implements a detailed overview of the entire decompiled application (you can see what packages, classes, methods, fields are in the jar), that's exactly what I needed! Because it was an open source repository, I just tweaked it a little, and now when decompiling, the program saves the xml file with the "contents of the jar file". And then I wrote an xml parser in c# to load data and further work with them. That's all...
Code with edited jd-gui saving xml file with jar content: https://drive.google.com/drive/folders/1_opg0BBIrmHoZ125F0Fyl9n_0o4xutiL?usp=sharing When loading a jar file, next to it (in the same folder) an xml file with the contents of this file will be saved.
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