Member predicate MetricPackage::getAfferentCoupling

Afferent Coupling (incoming dependencies).

The afferent coupling of a package is the number of types outside this package that depend on types inside this package.

A high afferent coupling is an indication that the package has many responsibilities; it may thus be a good idea to consider whether these responsibilities can be separated into separate packages.

Afferent coupling of packages is also used to define other package metrics, such as the instability metric.