1 files changed, 45 insertions, 0 deletions
diff --git a/src/controllers/FieldController.ts b/src/controllers/FieldController.ts
new file mode 100644
index 000000000..19205014a
--- /dev/null
+++ b/src/controllers/FieldController.ts
@@ -0,0 +1,45 @@
+import { TypedEvent } from "../util/TypedEvent";
+import { FieldUpdatedArgs } from "./FieldUpdatedArgs";
+import { DocumentReferenceController } from "./DocumentReferenceController";
+
+export abstract class FieldController {
+    Id: string;
+
+    FieldUpdated: TypedEvent<FieldUpdatedArgs>;
+
+    protected DereferenceImpl(): FieldController {
+        return this;
+    }
+    protected DereferenceToRootImpl(): FieldController {
+        let field = this;
+        while(field instanceof DocumentReferenceController) {
+            field = field.Dereference();
+        }
+        return field;
+    }
+
+    Dereference<T extends FieldController = FieldController>(ctor?: { new(): T }): T {
+        let field = this.DereferenceImpl();
+        if (ctor && field instanceof ctor) {
+            return field;
+        } else {
+            return null;
+        }
+    }
+
+    DereferenceToRoot<T extends FieldController = FieldController>(ctor?: { new(): T }): T {
+        let field = this.DereferenceToRootImpl();
+        if (ctor && field instanceof ctor) {
+            return field;
+        } else {
+            return null;
+        }
+    }
+
+    abstract TrySetValue(value: any): boolean;
+
+    abstract GetValue(): any;
+
+    abstract Copy(): FieldController;
+
+}
+\ No newline at end of file