[API] Wire in canContain via policy

src/adapter/bundle.js

@@ -2,12 +2,14 @@ define([
     'legacyRegistry',
     './directives/MCTView',
     './services/Instantiate',
-    './capabilities/APICapabilityDecorator'
+    './capabilities/APICapabilityDecorator',
+    './policies/AdapterCompositionPolicy'
 ], function (
     legacyRegistry,
     MCTView,
     Instantiate,
-    APICapabilityDecorator
+    APICapabilityDecorator,
+    AdapterCompositionPolicy
 ) {
     legacyRegistry.register('src/adapter', {
         "extensions": {
@@ -42,6 +44,13 @@ define([
                         "$injector"
                     ]
                 }
+            ],
+            policies: [
+                {
+                    category: "composition",
+                    implementation: AdapterCompositionPolicy,
+                    depends: [ "mct" ]
+                }
             ]
         }
     });

src/adapter/policies/AdapterCompositionPolicy.js

@@ -0,0 +1,26 @@
+define([], function () {
+    function AdapterCompositionPolicy(mct) {
+        this.mct = mct;
+    }
+
+    AdapterCompositionPolicy.prototype.allow = function (
+        containerType,
+        childType
+    ) {
+        var containerObject = containerType.getInitialModel();
+        var childObject = childType.getInitialModel();
+
+        containerObject.type = containerType.getKey();
+        childObject.type = childType.getKey();
+
+        var composition = mct.Composition(containerObject);
+
+        if (composition) {
+            return composition.canContain(childObject);
+        }
+
+        return true;
+    };
+
+    return AdapterCompositionPolicy;
+});