tree 66fc104cd8d473530bf97c788563b05437643a48
parent e7707580aa47b1dea03c2c6af2438219ee8d9bd6
author Benjamin Peterson <bp@benjamin.pe> 1512995497 -0800
committer Copybara-Service <copybara-piper@google.com> 1512995607 -0800

Avoid expansion of NestedSets in MiddlemanFactory.

MiddlemanFactory wants to check if the middleman inputs set is empty
or singleton. A NestedSet can answer both queries efficiently if the
right APIs are used.

My ultimate goal here is to avoid the expansion of runfiles artifacts
nested sets until execution.

Change-Id: I29a269df757ef41b1410bbb492cf24c926df6114
PiperOrigin-RevId: 178600943