methodical.impl.dispatcher.common — methodical 0.15.1

Utility functions for implementing Dispatchers.

ambiguous? clj

(ambiguous? hierarchy prefs dispatch-value dispatch-val-x dispatch-val-y)

True if neither dispatch-val-x nor dispatch-val-y dominate one another, e.g. because they are the same value or are both equally-specific ancestors.

distinct-by clj

(distinct-by f coll)

Like distinct, but uses value of (f item) to determine whether to keep each item in the resulting collection.

dominates? clj

(dominates? hierarchy prefs x y)

(dominates? hierarchy prefs default-dispatch-value x y)

True if dispatch value x should be considered more specific for purposes of method combination over dispatch value y, e.g. because x derives from y, or because x (or one of its ancestors) has been explicitly preferred over y (or one of its ancestors).

4-arity version does not take the default-dispatch-value into account, but 5-arity version does.

domination-comparator clj

(domination-comparator dominates?-pred)

(domination-comparator hierarchy prefs)

(domination-comparator hierarchy prefs dispatch-value)

Given a hierarchy and prefs return a function that can be used to sort dispatch values from most-specific to least-specific.

prefers? clj

(prefers? hierarchy prefs x y)

True if x or one of its ancestors is preferred over y or one of its ancestors.