Rename nestingMiddleware to PathHandler.nestedIn.

lib/src/util/path_handler.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:path/path.dart' as p;
 import 'package:shelf/shelf.dart' as shelf;
 
 /// A handler that routes to sub-handlers based on exact path prefixes.
 class PathHandler {
   /// A trie of path components to handlers.
   final _paths = new _Node();
 
   /// The shelf handler.
   shelf.Handler get handler => _onRequest;
 
-  PathHandler();
+  /// Returns middleware that nests all requests beneath the URL prefix
+  /// [beneath].
+  static shelf.Middleware nestedIn(String beneath) {
+    return (handler) {
+      var pathHandler = new PathHandler()..add(beneath, handler);
+      return pathHandler.handler;
+    };
+  }
 
   /// Routes requests at or under [path] to [handler].
   ///
   /// If [path] is a parent or child directory of another path in this handler,
   /// the longest matching prefix wins.
   void add(String path, shelf.Handler handler) {
     var node = _paths;
     for (var component in p.url.split(path)) {
       node = node.children.putIfAbsent(component, () => new _Node());
     }
@@ skipping 13 matching lines @@
       handlerIndex = i;
     }
 
     if (handler == null) return new shelf.Response.notFound("Not found.");
 
     return handler(request.change(
         path: p.url.joinAll(components.take(handlerIndex + 1))));
   }
 }
 
-/// Returns middleware that nests all requests beneath the URL prefix [beneath].
-shelf.Middleware nestingMiddleware(String beneath) {
-  return (handler) {
-    var pathHandler = new PathHandler()..add(beneath, handler);
-    return pathHandler.handler;
-  };
-}
-
 /// A trie node.
 class _Node {
   shelf.Handler handler;
   final children = new Map<String, _Node>();
 }