Adds browser-side component of Java Bridge for a TabContents

content/browser/renderer_host/java_bridge_dispatcher_host_manager.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_BROWSER_RENDERER_JAVA_BRIDGE_DISPATCHER_HOST_MANAGER_H_
+#define CONTENT_BROWSER_RENDERER_JAVA_BRIDGE_DISPATCHER_HOST_MANAGER_H_
+#pragma once
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/string16.h"
+#include "content/browser/tab_contents/tab_contents_observer.h"
+
+#include <map>

[jam, 2011/10/21 16:18:21]

nit: this goes first

+
+class JavaBridgeDispatcherHost;
+class RenderViewHost;
+struct NPObject;
+
+// This class handles injecting Java objects into all of the RenderViews
+// associated with a TabContents. It manages a set of JavaBridgeDispatcherHost
+// objects, one per RenderViewHost.
+class JavaBridgeDispatcherHostManager : public TabContentsObserver {
+ public:
+  JavaBridgeDispatcherHostManager(TabContents* tab_contents);
+
+  // These methods add or remove the object to each JavaBridgeDispatcherHost.
+  // Each one holds a reference to the NPObject while the object is bound to
+  // the corresponding RenderView. See JavaBridgeDispatcherHost for details.
+  void AddNamedObject(const string16& name, NPObject* object);
+  void RemoveNamedObject(const string16& name);
+
+  // TabContentsObserver overrides
+  virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
+  virtual void RenderViewDeleted(RenderViewHost* render_view_host) OVERRIDE;
+  virtual void TabContentsDestroyed(TabContents* tab_contents) OVERRIDE;
+
+ private:
+  friend class scoped_ptr<JavaBridgeDispatcherHostManager>;

[jam, 2011/10/21 16:18:21]

i haven't seen this pattern before with scoped_ptr

+  virtual ~JavaBridgeDispatcherHostManager();
+
+  typedef std::map<RenderViewHost*, scoped_refptr<JavaBridgeDispatcherHost> >
+      InstanceMap;
+  InstanceMap instances_;
+  typedef std::map<string16, NPObject*> ObjectMap;
+  ObjectMap objects_;
+
+  DISALLOW_COPY_AND_ASSIGN(JavaBridgeDispatcherHostManager);
+};
+
+#endif  // CONTENT_BROWSER_RENDERER_JAVA_BRIDGE_DISPATCHER_HOST_MANAGER_H_