chrome/browser/autocomplete/autocomplete_field_trial.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_FIELD_TRIAL_H_
#define CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_FIELD_TRIAL_H_
#pragma once

#include <string>

#include "base/basictypes.h"

// This class manages the Autocomplete field trials.
class AutocompleteFieldTrial {
 public:
  // Creates the field trial groups.
  // *** MUST NOT BE CALLED MORE THAN ONCE. ***
  static void Activate();

  // ---------------------------------------------------------
  // For the inline History Quick Provider field trial.

  // Returns whether the user is in any field trial group for this
  // field trial.  False indicates that the field trial wasn't
  // successfully created for some reason.
  static bool InDisallowInlineHQPFieldTrial();

  // Returns whether the user should get the experiment setup or
  // the default setup for this field trial.  The experiment
  // group prohibits inlining suggestions.
  static bool InDisallowInlineHQPFieldTrialExperimentGroup();

  // ---------------------------------------------------------
  // For the suggest field trial.

  // Returns whether the user is in any field trial group for this
  // field trial.  False indicates that the field trial wasn't
  // successfully created for some reason.
  static bool InSuggestFieldTrial();

  // Gets the group name to use when sending a suggest query to Google.
  // Should only be called if InSuggestFieldTrial().
  static std::string GetSuggestGroupName();

  // Gets the group name (as a number) to use when sending a suggest query
  // to Google.  Should only be called if InSuggestFieldTrial().
  static int GetSuggestGroupNameAsNumber();

  // Gets the maximum number of groups in the suggest field trial.
  // (Useful for telling UMA_HISTOGRAM_ENUMERATION the number of buckets
  // to create.)
  static int GetSuggestNumberOfGroups();

 private:
  DISALLOW_IMPLICIT_CONSTRUCTORS(AutocompleteFieldTrial);
};

#endif  // CHROME_BROWSER_AUTOCOMPLETE_AUTOCOMPLETE_FIELD_TRIAL_H_