MongoTokenDao, TokenStore: Simplify constructors

This is a feature that I originally wished I could introduce into easejs.  I
enjoyed it in Scala.  Cuts down on a lot of boilerplate.

* src/server/token/MongoTokenDao.ts (constructor): Remove fields and replace
  with inline definitions.
* src/server/token/TokenStore.ts (constructor): Likewise.

src/server/token/MongoTokenDao.ts

@@ -43,41 +43,18 @@ import { context } from "../../error/ContextError";
  */
 export class MongoTokenDao implements TokenDao
 {
-    /**
-     * Mongo database collection
-     */
-    private readonly _collection: MongoCollection;
-
-    /**
-     * Field storing token data, relative to document root
-     */
-    private readonly _rootField: string;
-
-    /**
-     * Retrieve a Unix timestamp
-     *
-     * This is used for timestampping token updates.
-     */
-    private readonly _getTimestamp: () => UnixTimestamp;
-
-
     /**
      * Initialize connection
      *
-     * @param collection Mongo collection
+     * @param _collection Mongo collection
-     * @param root_field topmost field in mongo document
+     * @param _root_field topmost field in mongo document
-     * @param date_ctor  Date constructor
+     * @param _date_ctor  Date constructor
      */
     constructor(
-        collection:   MongoCollection,
+        private readonly _collection:   MongoCollection,
-        root_field:   string,
+        private readonly _root_field:   string,
-        getTimestamp: () => UnixTimestamp,
+        private readonly _getTimestamp: () => UnixTimestamp,
-    )
+    ) {}
-    {
-        this._collection   = collection;
-        this._rootField    = root_field;
-        this._getTimestamp = getTimestamp;
-    }
 
 
     /**
@@ -150,7 +127,7 @@ export class MongoTokenDao implements TokenDao
                     }
 
                     const prev_result = <TokenNamespaceResults>
-                        prev_data[ this._rootField ] || {};
+                        prev_data[ this._root_field ] || {};
 
                     const prev_ns = prev_result[ ns ];
 
@@ -281,7 +258,7 @@ export class MongoTokenDao implements TokenDao
                         return;
                     }
 
-                    const field = <TokenNamespaceResults>data[ this._rootField ]
+                    const field = <TokenNamespaceResults>data[ this._root_field ]
                         || {};
 
                     const ns_data = field[ ns ];
@@ -410,7 +387,7 @@ export class MongoTokenDao implements TokenDao
     private _genRoot( ns: TokenNamespace ): string
     {
         // XXX: injectable
-        return this._rootField + '.' + ns;
+        return this._root_field + '.' + ns;
     }
 };
 

src/server/token/TokenStore.ts

@@ -88,39 +88,20 @@ import { DocumentId } from "../../document/Document";
  */
 export class TokenStore
 {
-    /** Data access layer for underlying token data */
-    private readonly _dao: TokenDao;
-
-    /** Identifier of document to which store is constrained */
-    private readonly _doc_id: DocumentId;
-
-    /** Token namespace used for grouping per document */
-    private readonly _token_ns: TokenNamespace;
-
-    /** Token id generator (nullary, nondeterministic) */
-    private readonly _idgen: () => TokenId;
-
-
     /**
      * Initialize store
      *
-     * @param dao      data access layer
+     * @param _dao      data access layer
-     * @param doc_id   constrain store to given document id
+     * @param _doc_id   constrain store to given document id
-     * @param token_ns token namespace
+     * @param _token_ns token namespace
-     * @param idgen    token id generator
+     * @param _idgen    token id generator
      */
     constructor(
-        dao:      TokenDao,
+        private readonly _dao:      TokenDao,
-        doc_id:   DocumentId,
+        private readonly _doc_id:   DocumentId,
-        token_ns: TokenNamespace,
+        private readonly _token_ns: TokenNamespace,
-        idgen:    () => TokenId
+        private readonly _idgen:    () => TokenId
-    )
+    ) {}
-    {
-        this._dao      = dao;
-        this._doc_id   = doc_id;
-        this._token_ns = token_ns;
-        this._idgen    = idgen;
-    }
 
 
     /**