Apply any module to specific class

[ManosMachairas]

Hi,
I would like to ask if there is any way to apply an existing rule to a specific class. For example, let's say that I want to apply "RegexpSingleline" module to Enum classes only. I imagine it like this, but property "tokens" cannot be used in this module and it results in error:

Is there any way to achieve it without creating a custom rule?
Thanks in advance!!!

[nrmancuso]

@ManosMachairas there is a few different ways this could be handled, but it might be better to provide a concrete example of what you want to achieve, such as “How can I enforce xyz naming convention on enum constants?”.

[ManosMachairas]

A rule I want to apply is exactly this one! Enum entries should follow the following format: "^[A-Z][A-Z0-9_]*$".

At first, I tried to create a "TreeWalker" and apply the "tokens" property in it, so that each module inherit that property and check only enum classes like the snippet below, but "TreeWalker" does not accept this property.

[nrmancuso]

Please take a look through our naming conventions checks: https://checkstyle.sourceforge.io/checks/naming/index.html

These are checks that target specific language elements in Java code, whereas regexp checks are more general.

I also recommend you to read our documentation about configuring checkstyle: https://checkstyle.sourceforge.io/config.html

Also, it is helpful to provide examples of code that you expect to be acceptable, and code that you expect violations on, to make sure we understand your needs.

[romani]

Use https://checkstyle.org/checks/naming/typename.html
And put enum token only.

You need to put config under proper parent, it should be Checker in your case
https://checkstyle.org/checks/regexp/regexpsingleline.html#Example1-config