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// Copyright (c) 2012 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/java_bridge_dispatcher.h"
#include "content/child/child_process.h"
#include "content/child/npobject_util.h" // For CreateNPVariant()
#include "content/common/java_bridge_messages.h"
#include "content/public/renderer/render_thread.h"
#include "content/public/renderer/render_view.h"
#include "content/renderer/java/java_bridge_channel.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebBindings.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
namespace content {
JavaBridgeDispatcher::JavaBridgeDispatcher(RenderView* render_view)
: RenderViewObserver(render_view) {
}
bool JavaBridgeDispatcher::EnsureChannelIsSetUp() {
if (channel_.get()) {
return true;
}
IPC::ChannelHandle channel_handle;
Send(new JavaBridgeHostMsg_GetChannelHandle(routing_id(), &channel_handle));
channel_ = JavaBridgeChannel::GetJavaBridgeChannel(
channel_handle, ChildProcess::current()->io_message_loop_proxy());
return channel_.get();
}
JavaBridgeDispatcher::~JavaBridgeDispatcher() {
for (ObjectMap::const_iterator iter = objects_.begin();
iter != objects_.end(); ++iter) {
WebKit::WebBindings::releaseObject(NPVARIANT_TO_OBJECT(iter->second));
}
}
bool JavaBridgeDispatcher::OnMessageReceived(const IPC::Message& msg) {
bool handled = true;
IPC_BEGIN_MESSAGE_MAP(JavaBridgeDispatcher, msg)
IPC_MESSAGE_HANDLER(JavaBridgeMsg_AddNamedObject, OnAddNamedObject)
IPC_MESSAGE_HANDLER(JavaBridgeMsg_RemoveNamedObject,
OnRemoveNamedObject)
IPC_MESSAGE_UNHANDLED(handled = false)
IPC_END_MESSAGE_MAP()
return handled;
}
void JavaBridgeDispatcher::DidClearWindowObject(WebKit::WebFrame* web_frame) {
// Note that we have to (re)bind all objects, as they will have been unbound
// when the window object was cleared.
for (ObjectMap::const_iterator iter = objects_.begin();
iter != objects_.end(); ++iter) {
// This refs the NPObject. This reference is dropped when either the window
// object is later cleared, or the object is GC'ed. So the object may be
// deleted at any time after OnRemoveNamedObject() is called.
web_frame->bindToWindowObject(iter->first,
NPVARIANT_TO_OBJECT(iter->second));
}
}
void JavaBridgeDispatcher::OnAddNamedObject(
const string16& name,
const NPVariant_Param& variant_param) {
DCHECK_EQ(variant_param.type, NPVARIANT_PARAM_SENDER_OBJECT_ROUTING_ID);
if (!EnsureChannelIsSetUp()) {
// It's possible for |channel_| to be NULL if the RenderView is going away.
return;
}
// This creates an NPObject, wrapped as an NPVariant. Pass 0 for the for
// containing window, as this is only used by plugins to pump the window
// message queue when a method on a renderer-side object causes a dialog to
// be displayed, and the Java Bridge does not need this functionality. The
// page URL is also not required.
NPVariant variant;
bool created =
CreateNPVariant(variant_param, channel_.get(), &variant, 0, GURL());
DCHECK(created);
DCHECK_EQ(variant.type, NPVariantType_Object);
// The NPObject is created with a ref count of one, which we remove when
// OnRemoveNamedObject() is called for that object.
ObjectMap::iterator iter = objects_.find(name);
if (iter != objects_.end()) {
WebKit::WebBindings::releaseObject(NPVARIANT_TO_OBJECT(iter->second));
}
objects_[name] = variant;
}
void JavaBridgeDispatcher::OnRemoveNamedObject(const string16& name) {
// Removing an object does not unbind it from JavaScript until the window
// object is next cleared. Note that the browser checks that the named object
// is present.
ObjectMap::iterator iter = objects_.find(name);
DCHECK(iter != objects_.end());
WebKit::WebBindings::releaseObject(NPVARIANT_TO_OBJECT(iter->second));
objects_.erase(iter);
}
} // namespace content
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