[Android] Implement renderer side of Gin Java Bridge

content/renderer/java/gin_java_bridge_dispatcher.cc

+// Copyright 2014 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/renderer/java/gin_java_bridge_dispatcher.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/common/gin_java_bridge_messages.h"
+#include "content/public/renderer/render_frame.h"
+#include "content/renderer/java/gin_java_bridge_object.h"
+#include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebView.h"
+
+namespace content {
+
+GinJavaBridgeDispatcher::GinJavaBridgeDispatcher(RenderFrame* render_frame)
+    : RenderFrameObserver(render_frame) {
+}
+
+GinJavaBridgeDispatcher::~GinJavaBridgeDispatcher() {
+}
+
+bool GinJavaBridgeDispatcher::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(GinJavaBridgeDispatcher, msg)
+    IPC_MESSAGE_HANDLER(GinJavaBridgeMsg_AddNamedObject, OnAddNamedObject)
+    IPC_MESSAGE_HANDLER(GinJavaBridgeMsg_RemoveNamedObject, OnRemoveNamedObject)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void GinJavaBridgeDispatcher::DidClearWindowObject() {
+  for (NamedObjectMap::const_iterator iter = named_objects_.begin();
+       iter != named_objects_.end(); ++iter) {
+    // Always create a new GinJavaBridgeObject, so we don't pull any of the V8
+    // wrapper's custom properties into the context of the page we have
+    // navigated to. The old GinJavaBridgeObject will be automatically
+    // deleted after its wrapper will be collected.
+    // On the browser side, we ignore wrapper deletion events for named objects,
+    // as they are only removed upon embedder's request (RemoveNamedObject).
+    if (objects_.Lookup(iter->second))
+      objects_.Remove(iter->second);
+    GinJavaBridgeObject* object = GinJavaBridgeObject::InjectNamed(
+        render_frame()->GetWebFrame(), AsWeakPtr(), iter->first, iter->second);
+    if (object) {
+      objects_.AddWithID(object, iter->second);
+    } else {
+      // Inform the host about wrapper creation failure.
+      render_frame()->Send(new GinJavaBridgeHostMsg_ObjectWrapperDeleted(
+          routing_id(), iter->second));
+    }
+  }
+}
+
+void GinJavaBridgeDispatcher::OnAddNamedObject(
+    const std::string& name,
+    ObjectID object_id) {
+  // Added objects only become available after page reload, so here they
+  // are only added into the internal map.
+  named_objects_.insert(std::make_pair(name, object_id));
+}
+
+void GinJavaBridgeDispatcher::OnRemoveNamedObject(const std::string& name) {
+  // Removal becomes in effect on next reload. We simply removing the entry
+  // from the map here.
+  NamedObjectMap::iterator iter = named_objects_.find(name);
+  DCHECK(iter != named_objects_.end());
+  named_objects_.erase(iter);
+}
+
+void GinJavaBridgeDispatcher::GetJavaMethods(
+    ObjectID object_id,
+    std::set<std::string>* methods) {
+  render_frame()->Send(new GinJavaBridgeHostMsg_GetMethods(
+      routing_id(), object_id, methods));
+}
+
+bool GinJavaBridgeDispatcher::HasJavaMethod(ObjectID object_id,
+                                            const std::string& method_name) {
+  bool result;
+  render_frame()->Send(new GinJavaBridgeHostMsg_HasMethod(
+      routing_id(), object_id, method_name, &result));
+  return result;
+}
+
+scoped_ptr<base::Value> GinJavaBridgeDispatcher::InvokeJavaMethod(
+    ObjectID object_id,
+    const std::string& method_name,
+    const base::ListValue& arguments) {
+  base::ListValue result_wrapper;
+  render_frame()->Send(
+      new GinJavaBridgeHostMsg_InvokeMethod(routing_id(),
+                                            object_id,
+                                            method_name,
+                                            arguments,
+                                            &result_wrapper));
+  base::Value* result;
+  if (result_wrapper.Get(0, &result)) {
+    return scoped_ptr<base::Value>(result->DeepCopy());
+  } else {
+    return scoped_ptr<base::Value>();
+  }
+}
+
+GinJavaBridgeObject* GinJavaBridgeDispatcher::GetObject(ObjectID object_id) {
+  GinJavaBridgeObject* result = objects_.Lookup(object_id);
+  if (!result) {
+    result = GinJavaBridgeObject::InjectAnonymous(AsWeakPtr(), object_id);
+    if (result)
+      objects_.AddWithID(result, object_id);
+  }
+  return result;
+}
+
+void GinJavaBridgeDispatcher::OnGinJavaBridgeObjectDeleted(ObjectID object_id) {
+  if (!objects_.Lookup(object_id))
+    return;
+  objects_.Remove(object_id);
+  render_frame()->Send(
+      new GinJavaBridgeHostMsg_ObjectWrapperDeleted(routing_id(), object_id));
+}
+
+}  // namespace content