flip

fun Map<String, Set<String>>.flip(): Map<String, Set<String>>(source)

Flips a map. In the context of ComputeAffectedProjectsTask, we use this to flip a map of projects to their dependencies to a map of projects to the projects that depend on them. We use this to find all affected projects given a seed of changed projects.

Example:

Given a map
{a:[b, c], b:[d], c:[d], d:[]}
return
{b:[a], c:[a], d:[b, c]}