components/omnibox/browser/autocomplete_classifier.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_CLASSIFIER_H_
   6 #define COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_CLASSIFIER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/strings/string16.h"
  12 #include "components/keyed_service/core/keyed_service.h"
  13 #include "components/metrics/proto/omnibox_event.pb.h"
  14 #include "components/omnibox/browser/autocomplete_scheme_classifier.h"
  15
  16 class AutocompleteController;
  17 struct AutocompleteMatch;
  18 class GURL;
  19
  20 class AutocompleteClassifier : public KeyedService {
  21  public:
  22   // Bitmap of AutocompleteProvider::Type values describing the default set of
  23   // providers queried for the omnibox.  Intended to be passed to
  24   // AutocompleteController().
  25   static const int kDefaultOmniboxProviders;
  26
  27   AutocompleteClassifier(
  28       scoped_ptr<AutocompleteController> controller_,
  29       scoped_ptr<AutocompleteSchemeClassifier> scheme_classifier);
  30   ~AutocompleteClassifier() override;
  31
  32   // Given some string |text| that the user wants to use for navigation,
  33   // determines how it should be interpreted.
  34   // |prefer_keyword| should be true the when keyword UI is onscreen; see
  35   // comments on AutocompleteController::Start().
  36   // |allow_exact_keyword_match| should be true when treating the string as a
  37   // potential keyword search is valid; see
  38   // AutocompleteInput::allow_exact_keyword_match().
  39   // |page_classification| gives information about the context (e.g., is the
  40   // user on a search results page doing search term replacement); this may
  41   // be useful in deciding how the input should be interpreted.
  42   // |match| should be a non-NULL outparam that will be set to the default
  43   // match for this input, if any (for invalid input, there will be no default
  44   // match, and |match| will be left unchanged).  |alternate_nav_url| is a
  45   // possibly-NULL outparam that, if non-NULL, will be set to the navigational
  46   // URL (if any) in case of an accidental search; see comments on
  47   // AutocompleteResult::alternate_nav_url_ in autocomplete.h.
  48   void Classify(const base::string16& text,
  49                 bool prefer_keyword,
  50                 bool allow_exact_keyword_match,
  51                 metrics::OmniboxEventProto::PageClassification
  52                     page_classification,
  53                 AutocompleteMatch* match,
  54                 GURL* alternate_nav_url);
  55
  56  private:
  57   // KeyedService:
  58   void Shutdown() override;
  59
  60   scoped_ptr<AutocompleteController> controller_;
  61   scoped_ptr<AutocompleteSchemeClassifier> scheme_classifier_;
  62
  63   // Are we currently in Classify? Used to verify Classify isn't invoked
  64   // recursively, since this can corrupt state and cause crashes.
  65   bool inside_classify_;
  66
  67   DISALLOW_IMPLICIT_CONSTRUCTORS(AutocompleteClassifier);
  68 };
  69
  70 #endif  // COMPONENTS_OMNIBOX_BROWSER_AUTOCOMPLETE_CLASSIFIER_H_