[FLINK-3075] Rename Either creation methods to avoid name clash with projection methods

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Assignee: Gyula Fora
• Reporter: Gyula Fora
• Created: 24/Nov/15 18:06
• Updated: 28/Feb/19 14:29
• Resolved: 29/Nov/15 21:31

Description

Currently the method signatures for creating Either values `Either.left(left)` and the projection methods `either.left()` only differ in the parameters.

This makes it awkward to use with lambdas such as: 'eitherStream.filter(Either:isLeft).map(Either::left)'
The above code is currently impossible.

I suggest to change the creation methods to `Either.createLeft(left)` and `Either.createRight(right)` and also to directly expose the Left, Right classes.