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// 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 CHROME_BROWSER_ALTERNATE_NAV_URL_FETCHER_H_
#define CHROME_BROWSER_ALTERNATE_NAV_URL_FETCHER_H_
#pragma once
#include <string>
#include "base/memory/scoped_ptr.h"
#include "content/public/common/url_fetcher_delegate.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "googleurl/src/gurl.h"
class NavigationController;
namespace net {
class URLRequestStatus;
}
// Attempts to get the HEAD of a host name and displays an info bar if the
// request was successful. This is used for single-word queries where we can't
// tell if the entry was a search or an intranet hostname. The autocomplete bar
// assumes it's a query and issues an AlternateNavURLFetcher to display a "did
// you mean" infobar suggesting a navigation.
//
// The memory management of this object is a bit tricky. The location bar view
// will create us and be responsible for us until we attach as an observer
// after a pending load starts (it will delete us if this doesn't happen).
// Once this pending load starts, we're responsible for deleting ourselves.
// We'll do this in the following cases:
// * The tab is navigated again once we start listening (so the fetch is no
// longer useful)
// * The tab is closed before we show an infobar
// * The intranet fetch fails
// * None of the above apply, so we successfully show an infobar
class AlternateNavURLFetcher : public content::NotificationObserver,
public content::URLFetcherDelegate {
public:
enum State {
NOT_STARTED,
IN_PROGRESS,
SUCCEEDED,
FAILED,
};
explicit AlternateNavURLFetcher(const GURL& alternate_nav_url);
virtual ~AlternateNavURLFetcher();
State state() const { return state_; }
private:
// content::NotificationObserver
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// content::URLFetcherDelegate
virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
// Sets |controller_| to the supplied pointer and begins fetching
// |alternate_nav_url_|.
void StartFetch(NavigationController* controller);
// Sets |state_| to either SUCCEEDED or FAILED depending on the result of the
// fetch.
void SetStatusFromURLFetch(const GURL& url,
const net::URLRequestStatus& status,
int response_code);
// Displays the infobar if all conditions are met (the page has loaded and
// the fetch of the alternate URL succeeded). Unless we're still waiting on
// one of the above conditions to finish, this will also delete us, as whether
// or not we show an infobar, there is no reason to live further.
void ShowInfobarIfPossible();
GURL alternate_nav_url_;
scoped_ptr<content::URLFetcher> fetcher_;
NavigationController* controller_;
State state_;
bool navigated_to_entry_;
content::NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(AlternateNavURLFetcher);
};
#endif // CHROME_BROWSER_ALTERNATE_NAV_URL_FETCHER_H_
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