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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 "base/stringprintf.h"
#include "chrome/browser/extensions/web_intent_callbacks.h"
#include "chrome/browser/profiles/profile_dependency_manager.h"
#include "chrome/common/extensions/extension.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/browser/web_intents_dispatcher.h"
namespace {
// Get the key for use inside the internal pending WebIntentCallbacks map.
std::string GetKey(const extensions::Extension* extension, int id) {
return StringPrintf("%s/%d", extension->id().c_str(), id);
}
} // namespace
namespace extensions {
// SourceObserver is a subclass of WebContentsObserver that is instantiated
// on RegisterCallback to wait for the source WebContents to be destroyed.
// If it is destroyed, this automatically clears the callback from pending_.
class WebIntentCallbacks::SourceObserver : content::WebContentsObserver {
public:
SourceObserver(content::WebContents* web_contents,
WebIntentCallbacks* callbacks,
const std::string& key)
: content::WebContentsObserver(web_contents),
callbacks_(callbacks),
key_(key) {}
virtual ~SourceObserver() {}
// Implement WebContentsObserver
virtual void WebContentsDestroyed(content::WebContents* web_contents)
OVERRIDE {
content::WebIntentsDispatcher* dispatcher =
callbacks_->GetAndClear(key_);
if (dispatcher)
delete dispatcher;
delete this;
}
private:
WebIntentCallbacks* callbacks_;
const std::string key_;
};
WebIntentCallbacks::WebIntentCallbacks() : last_id_(0) {}
WebIntentCallbacks::~WebIntentCallbacks() {}
// static
WebIntentCallbacks* WebIntentCallbacks::Get(Profile* profile) {
return Factory::GetForProfile(profile);
}
int WebIntentCallbacks::RegisterCallback(
const Extension* extension,
content::WebIntentsDispatcher* dispatcher,
content::WebContents* source) {
int id = ++last_id_;
std::string key = GetKey(extension, id);
pending_[key] = dispatcher;
// TODO(thorogood): We should also listen for extension suspend events, and
// clear the relevant callback (i.e., the handler of this intent)
// TODO(thorogood): The source window may actually be a ShellWindow of a
// platform app. In this case, we should not wait for its destruction:
// rather, we should be listening to platform app suspend events.
// Listen to when the source WebContent is destroyed. This object is self-
// deleting on this event.
DCHECK(source);
new SourceObserver(source, this, key);
return id;
}
content::WebIntentsDispatcher* WebIntentCallbacks::RetrieveCallback(
const Extension* extension, int id) {
std::string key = GetKey(extension, id);
return GetAndClear(key);
}
content::WebIntentsDispatcher* WebIntentCallbacks::GetAndClear(
const std::string& key) {
if (!pending_.count(key))
return NULL;
content::WebIntentsDispatcher* dispatcher = pending_[key];
pending_.erase(key);
return dispatcher;
}
///////////////////////////////////////////////////////////////////////////////
// Factory boilerplate
// static
WebIntentCallbacks* WebIntentCallbacks::Factory::GetForProfile(
Profile* profile) {
return static_cast<WebIntentCallbacks*>(
GetInstance()->GetServiceForProfile(profile, true));
}
WebIntentCallbacks::Factory* WebIntentCallbacks::Factory::GetInstance() {
return Singleton<WebIntentCallbacks::Factory>::get();
}
WebIntentCallbacks::Factory::Factory()
: ProfileKeyedServiceFactory("WebIntentCallbacks",
ProfileDependencyManager::GetInstance()) {
}
WebIntentCallbacks::Factory::~Factory() {
}
ProfileKeyedService* WebIntentCallbacks::Factory::BuildServiceInstanceFor(
Profile* profile) const {
return new WebIntentCallbacks();
}
} // namespace extensions
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