feat(reflector): added a method to get type's interfaces

modules/angular2/src/reflection/reflection_capabilities.dart

@@ -71,6 +71,11 @@ class ReflectionCapabilities {
     return meta.map((m) => m.reflectee).toList();
   }
 
+  List interfaces(type) {
+    ClassMirror classMirror = reflectType(type);
+    return classMirror.superinterfaces.map((si) => si.reflectedType).toList();
+  }
+
   GetterFn getter(String name) {
     var symbol = new Symbol(name);
     return (receiver) => reflect(receiver).getField(symbol).reflectee;

modules/angular2/src/reflection/reflection_capabilities.ts

@@ -1,4 +1,4 @@
-import {Type, isPresent, global, stringify} from 'angular2/src/facade/lang';
+import {Type, isPresent, global, stringify, BaseException} from 'angular2/src/facade/lang';
 import {List, ListWrapper} from 'angular2/src/facade/collection';
 import {GetterFn, SetterFn, MethodFn} from './types';
 
@@ -97,6 +97,10 @@ export class ReflectionCapabilities {
     return [];
   }
 
+  interfaces(type): List<any> {
+    throw new BaseException("JavaScript does not support interfaces");
+  }
+
   getter(name: string): GetterFn { return new Function('o', 'return o.' + name + ';'); }
 
   setter(name: string): SetterFn { return new Function('o', 'v', 'return o.' + name + ' = v;'); }

modules/angular2/src/reflection/reflector.ts

@@ -52,6 +52,14 @@ export class Reflector {
     }
   }
 
+  interfaces(type): List<any> {
+    if (MapWrapper.contains(this._typeInfo, type)) {
+      return MapWrapper.get(this._typeInfo, type)["interfaces"];
+    } else {
+      return this.reflectionCapabilities.interfaces(type);
+    }
+  }
+
   getter(name: string): GetterFn {
     if (MapWrapper.contains(this._getters, name)) {
       return MapWrapper.get(this._getters, name);

modules/angular2/src/transform/template_compiler/recording_reflection_capabilities.dart

@@ -20,6 +20,8 @@ class RecordingReflectionCapabilities implements ReflectionCapabilities {
 
   List<List> parameters(typeOrFunc) => _notImplemented('parameters');
 
+  List<List> interfaces(typeOrFunc) => _notImplemented('interfaces');
+
   List annotations(typeOrFunc) => _notImplemented('annotations');
 
   GetterFn getter(String name) {

modules/angular2/test/reflection/reflector_spec.ts

@@ -1,4 +1,4 @@
-import {describe, it, iit, ddescribe, expect, beforeEach} from 'angular2/test_lib';
+import {describe, it, iit, ddescribe, expect, beforeEach, IS_DARTIUM} from 'angular2/test_lib';
 import {Reflector} from 'angular2/src/reflection/reflection';
 import {ReflectionCapabilities} from 'angular2/src/reflection/reflection_capabilities';
 import {ClassDecorator, ParamDecorator, classDecorator, paramDecorator} from './reflector_common';
@@ -40,6 +40,11 @@ class TestObj {
   identity(arg) { return arg; }
 }
 
+class Interface {}
+
+class ClassImplementingInterface implements Interface {
+}
+
 export function main() {
   describe('Reflector', () => {
     var reflector;
@@ -93,12 +98,26 @@ export function main() {
         expect(reflector.annotations(TestObj)).toEqual([1, 2]);
       });
 
-      it("should work for a clas without annotations", () => {
+      it("should work for a class without annotations", () => {
         var p = reflector.annotations(ClassWithoutDecorators);
         expect(p).toEqual([]);
       });
     });
 
+    if (IS_DARTIUM) {
+      describe("interfaces", () => {
+        it("should return an array of interfaces for a type", () => {
+          var p = reflector.interfaces(ClassImplementingInterface);
+          expect(p).toEqual([Interface]);
+        });
+
+        it("should return an empty array otherwise", () => {
+          var p = reflector.interfaces(ClassWithDecorators);
+          expect(p).toEqual([]);
+        });
+      });
+    }
+
     describe("getter", () => {
       it("returns a function reading a property", () => {
         var getA = reflector.getter('a');