Adds browser-side component of Java Bridge for a TabContents

content/browser/renderer_host/java_bridge_dispatcher_host_manager.cc

+// 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.
+
+#include "content/browser/renderer_host/java_bridge_dispatcher_host_manager.h"
+
+#include "base/utf_string_conversions.h"
+#include "content/browser/renderer_host/java_bridge_dispatcher_host.h"
+#include "content/browser/tab_contents/tab_contents.h"
+
+JavaBridgeDispatcherHostManager::JavaBridgeDispatcherHostManager(
+    TabContents* tab_contents)
+    : TabContentsObserver(tab_contents) {
+}
+
+JavaBridgeDispatcherHostManager::~JavaBridgeDispatcherHostManager() {
+  DCHECK_EQ(0U, instances_.size());
+}
+
+void JavaBridgeDispatcherHostManager::AddNamedObject(const string16& name,
+    NPObject* object) {
+  // Record this object in a map so that we can add it into RenderViewHosts
+  // created later. We don't need to take a reference because each
+  // JavaBridgeDispatcherHost will do so. The object can't be deleted until
+  // after RemoveNamedObject() is called, at which time we remove the entry
+  // from the map.
+  DCHECK(!instances_.empty()) << "There must be at least one instance present";
+  objects_[name] = object;
+
+  for (InstanceMap::iterator iter = instances_.begin();
+      iter != instances_.end(); ++iter) {
+    iter->second->AddNamedObject(name, object);
+  }
+}
+
+void JavaBridgeDispatcherHostManager::RemoveNamedObject(const string16& name) {
+  ObjectMap::iterator iter = objects_.find(name);
+  if (iter == objects_.end()) {
+    return;
+  }
+
+  objects_.erase(iter);
+
+  for (InstanceMap::iterator iter = instances_.begin();
+      iter != instances_.end(); ++iter) {
+    iter->second->RemoveNamedObject(name);
+  }
+}
+
+void JavaBridgeDispatcherHostManager::RenderViewCreated(
+    RenderViewHost* render_view_host) {
+  // Creates a JavaBridgeDispatcherHost for the specified RenderViewHost and
+  // adds all currently registered named objects to the new instance.
+  scoped_refptr<JavaBridgeDispatcherHost> instance =
+      new JavaBridgeDispatcherHost(render_view_host);
+
+  for (ObjectMap::const_iterator iter = objects_.begin();
+      iter != objects_.end(); ++iter) {
+    instance->AddNamedObject(iter->first, iter->second);
+  }
+
+  instances_[render_view_host] = instance;
+}
+
+void JavaBridgeDispatcherHostManager::RenderViewDeleted(
+    RenderViewHost* render_view_host) {
+  instances_.erase(render_view_host);
+}
+
+void JavaBridgeDispatcherHostManager::TabContentsDestroyed(
+    TabContents* tab_contents) {
+  // When the tab is shutting down, the TabContents clears its observers before
+  // it kills all of its RenderViewHosts, so we won't get a call to
+  // RenderViewDeleted() for all RenderViewHosts.
+  instances_.clear();
+}