[LUCENE-10137] Refactor DirectReader and remove heavy code duplication

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: core/other
• Lucene Fields: New
• Assignee: Uwe Schindler
• Reporter: Uwe Schindler
• Created: 30/Sep/21 08:45
• Updated: 28/Aug/22 16:27
• Resolved: 30/Sep/21 12:02

Description

DirectReader creates a dozen of inner classes blowing up the JAR file that just contain the same code over an over.

This issue will refactor DirectReader like this:

• Let DirectReader implement LongValues directly
• The LongValues get method is implemented by calling LongUnaryOperator functional interface
• the LongUnaryOperator is a method reference to one of the new private getXY() methods, which are specialization for all supported bit sizes.

Issue Links

• links to: GitHub Pull Request #335