Componentize AutocompleteController and its supporting cast

chrome/browser/autocomplete/autocomplete_classifier.h

-// 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.
-
-#ifndef CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CLASSIFIER_H_
-#define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CLASSIFIER_H_
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string16.h"
-#include "components/keyed_service/core/keyed_service.h"
-#include "components/metrics/proto/omnibox_event.pb.h"
-#include "components/omnibox/autocomplete_scheme_classifier.h"
-
-class AutocompleteController;
-struct AutocompleteMatch;
-class GURL;
-
-class AutocompleteClassifier : public KeyedService {
- public:
-  // Bitmap of AutocompleteProvider::Type values describing the default set of
-  // providers queried for the omnibox.  Intended to be passed to
-  // AutocompleteController().
-  static const int kDefaultOmniboxProviders;
-
-  AutocompleteClassifier(
-      scoped_ptr<AutocompleteController> controller_,
-      scoped_ptr<AutocompleteSchemeClassifier> scheme_classifier);
-  ~AutocompleteClassifier() override;
-
-  // Given some string |text| that the user wants to use for navigation,
-  // determines how it should be interpreted.
-  // |prefer_keyword| should be true the when keyword UI is onscreen; see
-  // comments on AutocompleteController::Start().
-  // |allow_exact_keyword_match| should be true when treating the string as a
-  // potential keyword search is valid; see
-  // AutocompleteInput::allow_exact_keyword_match().
-  // |page_classification| gives information about the context (e.g., is the
-  // user on a search results page doing search term replacement); this may
-  // be useful in deciding how the input should be interpreted.
-  // |match| should be a non-NULL outparam that will be set to the default
-  // match for this input, if any (for invalid input, there will be no default
-  // match, and |match| will be left unchanged).  |alternate_nav_url| is a
-  // possibly-NULL outparam that, if non-NULL, will be set to the navigational
-  // URL (if any) in case of an accidental search; see comments on
-  // AutocompleteResult::alternate_nav_url_ in autocomplete.h.
-  void Classify(const base::string16& text,
-                bool prefer_keyword,
-                bool allow_exact_keyword_match,
-                metrics::OmniboxEventProto::PageClassification
-                    page_classification,
-                AutocompleteMatch* match,
-                GURL* alternate_nav_url);
-
- private:
-  // KeyedService:
-  void Shutdown() override;
-
-  scoped_ptr<AutocompleteController> controller_;
-  scoped_ptr<AutocompleteSchemeClassifier> scheme_classifier_;
-
-  // Are we currently in Classify? Used to verify Classify isn't invoked
-  // recursively, since this can corrupt state and cause crashes.
-  bool inside_classify_;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(AutocompleteClassifier);
-};
-
-#endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_CLASSIFIER_H_