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// Copyright 2013 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_UI_SEARCH_INSTANT_SEARCH_PRERENDERER_H_
#define CHROME_BROWSER_UI_SEARCH_INSTANT_SEARCH_PRERENDERER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string16.h"
#include "chrome/common/instant_types.h"
#include "content/public/browser/navigation_controller.h"
class GURL;
class Profile;
struct AutocompleteMatch;
namespace chrome {
struct NavigateParams;
}
namespace content {
class SessionStorageNamespace;
class WebContents;
}
namespace gfx {
class Size;
}
namespace prerender {
class PrerenderHandle;
}
// InstantSearchPrerenderer is responsible for prerendering the default search
// provider Instant search base page URL to prefetch high-confidence search
// suggestions. InstantSearchPrerenderer manages the prerender handle associated
// with the prerendered contents.
class InstantSearchPrerenderer {
public:
InstantSearchPrerenderer(Profile* profile, const GURL& url);
~InstantSearchPrerenderer();
// Returns the InstantSearchPrerenderer instance for the given |profile|.
static InstantSearchPrerenderer* GetForProfile(Profile* profile);
// Prerender the |prerender_url_| contents. |session_storage_namespace| is
// used to identify the namespace of the active tab at the time the prerender
// is generated. The |size| gives the initial size for the target
// prerender. InstantSearchPrerenderer will run at most one prerender at a
// time, so launching a prerender will cancel the previous prerenders (if
// any).
void Init(content::SessionStorageNamespace* session_storage_namespace,
const gfx::Size& size);
// Cancels the current request.
void Cancel();
// Tells the Instant search base page to prerender |suggestion|.
void Prerender(const InstantSuggestion& suggestion);
// Tells the Instant search base page to render the search results for the
// given |query|.
void Commit(const base::string16& query,
const EmbeddedSearchRequestParams& params);
// Returns true if the prerendered page can be used to process the search for
// the given |source|.
bool CanCommitQuery(content::WebContents* source,
const base::string16& query) const;
// Returns true and updates |params->target_contents| if a prerendered page
// exists for |url| and is swapped in.
bool UsePrerenderedPage(const GURL& url, chrome::NavigateParams* params);
// Returns the last prefetched search query.
const base::string16& get_last_query() const {
return last_instant_suggestion_.text;
}
// Returns true when prerendering is allowed for the given |source| and
// |match|.
bool IsAllowed(const AutocompleteMatch& match,
content::WebContents* source) const;
private:
friend class InstantSearchPrerendererTest;
content::WebContents* prerender_contents() const;
// Returns true if the |query| matches the last prefetched search query or if
// the 'reuse_instant_search_base_page' flag is enabled in the field trials.
bool QueryMatchesPrefetch(const base::string16& query) const;
Profile* const profile_;
// Instant search base page URL.
const GURL prerender_url_;
scoped_ptr<prerender::PrerenderHandle> prerender_handle_;
InstantSuggestion last_instant_suggestion_;
DISALLOW_COPY_AND_ASSIGN(InstantSearchPrerenderer);
};
#endif // CHROME_BROWSER_UI_SEARCH_INSTANT_SEARCH_PRERENDERER_H_
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