More stuff set up

1 files changed, 54 insertions, 0 deletions

diff --git a/src/fields/Field.ts b/src/fields/Field.ts
new file mode 100644
index 000000000..46f92f203
--- /dev/null
+++ b/src/fields/Field.ts
@@ -0,0 +1,54 @@
+import { TypedEvent } from "../util/TypedEvent";
+import { FieldUpdatedArgs } from "./FieldUpdatedArgs";
+import { DocumentReference } from "./DocumentReference";
+import { Utils } from "../Utils";
+
+export function Cast<T extends Field>(field: Opt<Field>, ctor: { new(): T }): Opt<T> {
+    if (field) {
+        if (ctor && field instanceof ctor) {
+            return field;
+        }
+    }
+    return undefined;
+}
+
+export type Opt<T> = T | undefined;
+
+export abstract class Field {
+    //FieldUpdated: TypedEvent<Opt<FieldUpdatedArgs>> = new TypedEvent<Opt<FieldUpdatedArgs>>();
+
+    private id: string;
+    get Id(): string {
+        return this.id;
+    }
+
+    constructor(id: Opt<string> = undefined) {
+        this.id = id || Utils.GenerateGuid();
+    }
+
+    Dereference(): Opt<Field> {
+        return this;
+    }
+    DereferenceToRoot(): Opt<Field> {
+        return this;
+    }
+
+    DereferenceT<T extends Field = Field>(ctor: { new(): T }): Opt<T> {
+        return Cast(this.Dereference(), ctor);
+    }
+
+    DereferenceToRootT<T extends Field = Field>(ctor: { new(): T }): Opt<T> {
+        return Cast(this.DereferenceToRoot(), ctor);
+    }
+
+    Equals(other: Field): boolean {
+        return this.id === other.id;
+    }
+
+    abstract TrySetValue(value: any): boolean;
+
+    abstract GetValue(): any;
+
+    abstract Copy(): Field;
+
+}
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