Josh Lemer created FLINK-9264:
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Summary: Add method Writer[A]#contramap[B](f: B => A): Writer[B]
Key: FLINK-9264
URL: https://issues.apache.org/jira/browse/FLINK-9264
Project: Flink
Issue Type: Task
Components: FileSystem
Affects Versions: 1.5.0
Reporter: Josh Lemer
Similar to https://issues.apache.org/jira/browse/FLINK-9221, it would be very
handy to have a `Add method Writer[A]#contramap[B](f: B => A): Writer[B]`
method, which would allow reuse of existing writers, with a "formatting"
function placed infront of it. For example:
val stringWriter = new StringWriter[String]()
val intWriter: Writer[Int] = stringWriter.contraMap[Int](_.toString)
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