style: make utility classes proper utilities

[vil02]

Brief Summary of Changes

All changed classes are now marked as final and their default constructor as private (i.e. it is hidden).

What does this PR address?

• GitHub issue (Add reference - Hide constructors of utility classes #340)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No

Reviewer, please note:

Fixes #340.

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all the tests pass.

[vil02]

@adimiz1, @michal-sordyl-cloudinary, @colbyfayock: is there anything else what I should do regarding this pull request?

[colbyfayock]

thanks @vil02 for the PR. This will be reviewed by the relevant SDK team member.

While this will count towards hacktoberfest.com as the label is on the repository, just wanted to clarify that this will not count towards Cloudinary's Hacktoberfest swag based on the rules provided here: https://cld.media/hacktoberfest

we appreciate your contribution to improving the code health of the project!

[vil02]

just wanted to clarify that this will not count towards Cloudinary's Hacktoberfest swag based on the rules provided here: https://cld.media/hacktoberfest

@colbyfayock: could you please elaborate more on that? I thought that #340 (comment) counts as an approval.

[colbyfayock]

i think the confusion is that the person who was giving you the go ahead was just simply saying you could put together a PR when you asked:

So... could I create a pull request fixing this?

but because i could see how that could be confusing we'll just let it count towards the swag pack if it's approved and merged

[vil02]

@colbyfayock: thanks! That is nice of you. Let's hope this will be merged in time.

[colbyfayock]

@vil02 thanks for your contribution! this PR is eligible for free Cloudinary Hackatoberfest swag. Please send me an email at [email protected] with your name, GitHub username, and a link to the PR where I'll send further instructions.

Happy Hacktoberfest!

[vil02]

@vil02 thanks for your contribution! this PR is eligible for free Cloudinary Hackatoberfest swag. Please send me an email at [email protected] with your name, GitHub username, and a link to the PR where I'll send further instructions.

Happy Hacktoberfest!

@colbyfayock: done.