Centralize configure-able factory classes

src/di/factory/AbstractFactory.ts

@@ -1,5 +1,6 @@
-import {DependencyKey, DependencyRequirement, PropertyDependency} from '../types'
-import { Collection } from '../../util'
+import {DependencyKey, DependencyRequirement, Instantiable, PropertyDependency} from '../types'
+import {Collection, logIfDebugging} from '../../util'
+import {getPropertyInjectionMetadata} from '../decorator/getPropertyInjectionMetadata'
 
 /**
  * Abstract base class for dependency container factories.
@@ -42,6 +43,22 @@ export abstract class AbstractFactory<T> {
      */
     abstract getInjectedProperties(): Collection<PropertyDependency>
 
+    /** Helper method that returns all `@Inject()`'ed properties for a token and its prototypical ancestors. */
+    protected getInjectedPropertiesForPrototypeChain(token: Instantiable<any>): Collection<PropertyDependency> {
+        const meta = new Collection<PropertyDependency>()
+
+        do {
+            const loadedMeta = getPropertyInjectionMetadata(token)
+            if ( loadedMeta ) {
+                meta.concat(loadedMeta)
+            }
+            token = Object.getPrototypeOf(token)
+            logIfDebugging('extollo.di.injection', 'next currentToken:', token)
+        } while (token !== Function.prototype && token !== Object.prototype)
+
+        return meta
+    }
+
     /**
      * Get a human-readable name of the token this factory produces.
      * This is meant for debugging output only.