refactor: fix SonarQube - make field 'private', use accessor

[zielint0]

Change access level from 'public' to 'private'.
Use accessor in other places.

I even did not add an accessor - it existed so I used it. I assume that this public accessor (getContext()) was added to have this field private. Should not be a compatibility issue.

[spoon-bot]

API changes: 1 (Detected by Revapi)

Old API: fr.inria.gforge.spoon:spoon-core:jar:7.1.0-20180809.071946-110 / New API: fr.inria.gforge.spoon:spoon-core:jar:7.1.0-SNAPSHOT

	Visibility was reduced from 'public' to 'private'.
Old	field DefaultJavaPrettyPrinter.context
New	field DefaultJavaPrettyPrinter.context
Breaking	binary: breaking,

[surli]

I assume that this public accessor (getContext()) was added to have this field private. Should not be a compatibility issue.

I agree this need a change however it could be a compatibility issue for users that inherits from DefaultJavaPrettyPrinter and uses the field context.
I propose that you add a deprecated annotation on it with a since 7.1.0. And add some javadoc to explain to use the getter instead. It will be removed in the next two releases.

[zielint0]

@surli

I propose that you add a deprecated annotation on it with a since 7.1.0. And add some javadoc to explain to use the getter instead. It will be removed in the next two releases.

Done. Please verify it.