Add AppLauncherId wrapper for items shown in shelf

chrome/browser/ui/ash/chrome_launcher_prefs.cc

Index: chrome/browser/ui/ash/chrome_launcher_prefs.cc
diff --git a/chrome/browser/ui/ash/chrome_launcher_prefs.cc b/chrome/browser/ui/ash/chrome_launcher_prefs.cc
index f4b87d8398319b2a81a355dafb0a992e1b7997fe..3c02681cf3a31e2848c5111f29bfb9c30343134e 100644
--- a/chrome/browser/ui/ash/chrome_launcher_prefs.cc
+++ b/chrome/browser/ui/ash/chrome_launcher_prefs.cc
@@ -42,7 +42,7 @@ const char* kDefaultPinnedApps[] = {
 base::ListValue* CreateDefaultPinnedAppsList() {
   std::unique_ptr<base::ListValue> apps(new base::ListValue);
   for (size_t i = 0; i < arraysize(kDefaultPinnedApps); ++i)
-    apps->Append(CreateAppDict(kDefaultPinnedApps[i]));
+    apps->Append(CreateAppDict(AppLauncherId(kDefaultPinnedApps[i])));
 
   return apps.release();
 }
@@ -206,10 +206,11 @@ void PropagatePrefToLocalIfNotSet(
 }
 
 struct PinInfo {
-  PinInfo(const std::string& app_id, const syncer::StringOrdinal& item_ordinal)
-      : app_id(app_id), item_ordinal(item_ordinal) {}
+  PinInfo(const AppLauncherId& app_launcher_id,
+          const syncer::StringOrdinal& item_ordinal)
+      : app_launcher_id(app_launcher_id), item_ordinal(item_ordinal) {}
 
-  std::string app_id;
+  AppLauncherId app_launcher_id;
   syncer::StringOrdinal item_ordinal;
 };
 
@@ -223,23 +224,23 @@ struct ComparePinInfo {
 // to check if app exists in the list.
 class AppTracker {
  public:
-  bool HasApp(const std::string& app_id) const {
-    return app_set_.find(app_id) != app_set_.end();
+  bool HasApp(const AppLauncherId& app_launcher_id) const {
+    return app_set_.find(app_launcher_id) != app_set_.end();
   }
 
-  void AddApp(const std::string& app_id) {
-    if (HasApp(app_id))
+  void AddApp(const AppLauncherId& app_launcher_id) {
+    if (HasApp(app_launcher_id))
       return;
-    app_list_.push_back(app_id);
-    app_set_.insert(app_id);
+    app_list_.push_back(app_launcher_id);
+    app_set_.insert(app_launcher_id);
   }
 
-  void MaybeAddApp(const std::string& app_id,
+  void MaybeAddApp(const AppLauncherId& app_launcher_id,
                    const LauncherControllerHelper* helper) {
-    DCHECK_NE(kPinnedAppsPlaceholder, app_id);
-    if (!helper->IsValidIDForCurrentUser(app_id))
+    DCHECK_NE(kPinnedAppsPlaceholder, app_launcher_id.ToString());
+    if (!helper->IsValidIDForCurrentUser(app_launcher_id.ToString()))
       return;
-    AddApp(app_id);
+    AddApp(app_launcher_id);
   }
 
   void MaybeAddAppFromPref(const base::DictionaryValue* app_pref,
@@ -260,14 +261,14 @@ class AppTracker {
       return;
     }
 
-    MaybeAddApp(app_id, helper);
+    MaybeAddApp(AppLauncherId(app_id), helper);
   }
 
-  const std::vector<std::string>& app_list() const { return app_list_; }
+  const std::vector<AppLauncherId>& app_list() const { return app_list_; }
 
  private:
-  std::vector<std::string> app_list_;
-  std::set<std::string> app_set_;
+  std::vector<AppLauncherId> app_list_;
+  std::set<AppLauncherId> app_set_;
 };
 
 }  // namespace
@@ -283,6 +284,18 @@ const char kShelfAlignmentBottom[] = "Bottom";
 const char kShelfAlignmentLeft[] = "Left";
 const char kShelfAlignmentRight[] = "Right";
 
+AppLauncherId::AppLauncherId(const std::string& app_id) : app_id_(app_id) {}
+
+AppLauncherId::AppLauncherId(const std::string& app_id,
+                             const std::string& launch_id)
+    : app_id_(app_id), launch_id_(launch_id) {}
+
+AppLauncherId::~AppLauncherId() {}
+
+bool AppLauncherId::operator<(const AppLauncherId& other) const {
+  return ToString() < other.ToString();
+}
+
 void RegisterChromeLauncherUserPrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   // TODO: If we want to support multiple profiles this will likely need to be
@@ -309,9 +322,9 @@ void RegisterChromeLauncherUserPrefs(
   registry->RegisterBooleanPref(prefs::kShowLogoutButtonInTray, false);
 }
 
-base::DictionaryValue* CreateAppDict(const std::string& app_id) {
+base::DictionaryValue* CreateAppDict(const AppLauncherId& app_launcher_id) {
   std::unique_ptr<base::DictionaryValue> app_value(new base::DictionaryValue);
-  app_value->SetString(kPinnedAppsPrefAppIDPath, app_id);
+  app_value->SetString(kPinnedAppsPrefAppIDPath, app_launcher_id.ToString());
   return app_value.release();
 }
 
@@ -408,15 +421,15 @@ void GetAppsPinnedByPolicy(const PrefService* prefs,
       for (const auto& activity : activities) {
         const std::string arc_app_id =
             ArcAppListPrefs::GetAppId(arc_package, activity);
-        apps->MaybeAddApp(arc_app_id, helper);
+        apps->MaybeAddApp(AppLauncherId(arc_app_id), helper);
       }
     } else {
-      apps->MaybeAddApp(app_id, helper);
+      apps->MaybeAddApp(AppLauncherId(app_id), helper);
     }
   }
 }
 
-std::vector<std::string> GetPinnedAppsFromPrefsLegacy(
+std::vector<AppLauncherId> GetPinnedAppsFromPrefsLegacy(
     const PrefService* prefs,
     const LauncherControllerHelper* helper) {
   // Adding the app list item to the list of items requires that the ID is not
@@ -433,7 +446,7 @@ std::vector<std::string> GetPinnedAppsFromPrefsLegacy(
 
   // Check if Chrome is in either of the the preferences lists.
   std::unique_ptr<base::Value> chrome_app(
-      CreateAppDict(extension_misc::kChromeAppId));
+      CreateAppDict(AppLauncherId(extension_misc::kChromeAppId)));
 
   AppTracker apps;
   GetAppsPinnedByPolicy(prefs, helper, &apps);
@@ -443,7 +456,7 @@ std::vector<std::string> GetPinnedAppsFromPrefsLegacy(
     // We need to position the chrome icon relative to its place in the pinned
     // preference list - even if an item of that list isn't shown yet.
     if (i == chrome_icon_index)
-      apps.AddApp(extension_misc::kChromeAppId);
+      apps.AddApp(AppLauncherId(extension_misc::kChromeAppId));
     const base::DictionaryValue* app_pref = nullptr;
     if (!pinned_apps->GetDictionary(i, &app_pref)) {
       LOG(ERROR) << "There is no dictionary for app entry.";
@@ -453,7 +466,7 @@ std::vector<std::string> GetPinnedAppsFromPrefsLegacy(
   }
 
   // If not added yet, the chrome item will be the last item in the list.
-  apps.AddApp(extension_misc::kChromeAppId);
+  apps.AddApp(AppLauncherId(extension_misc::kChromeAppId));
   return apps.app_list();
 }
 
@@ -532,11 +545,11 @@ syncer::StringOrdinal GetLastPinPosition(Profile* profile) {
                             : syncer::StringOrdinal::CreateInitialOrdinal();
 }
 
-std::vector<std::string> ImportLegacyPinnedApps(
+std::vector<AppLauncherId> ImportLegacyPinnedApps(
     const PrefService* prefs,
     LauncherControllerHelper* helper,
     const AppTracker& policy_apps) {
-  std::vector<std::string> legacy_pins =
+  std::vector<AppLauncherId> legacy_pins =
       GetPinnedAppsFromPrefsLegacy(prefs, helper);
   DCHECK(!legacy_pins.empty());
 
@@ -546,9 +559,9 @@ std::vector<std::string> ImportLegacyPinnedApps(
   syncer::StringOrdinal last_position =
       syncer::StringOrdinal::CreateInitialOrdinal();
   // Convert to sync item record.
-  for (const auto& app_id : legacy_pins) {
-    DCHECK_NE(kPinnedAppsPlaceholder, app_id);
-    app_service->SetPinPosition(app_id, last_position);
+  for (const auto& app_launcher_id : legacy_pins) {
+    DCHECK_NE(kPinnedAppsPlaceholder, app_launcher_id.ToString());
+    app_service->SetPinPosition(app_launcher_id.ToString(), last_position);
     last_position = last_position.CreateAfter();
   }
 
@@ -568,14 +581,14 @@ std::vector<std::string> ImportLegacyPinnedApps(
   return legacy_pins;
 }
 
-std::vector<std::string> GetPinnedAppsFromPrefs(
+std::vector<AppLauncherId> GetPinnedAppsFromPrefs(
     const PrefService* prefs,
     LauncherControllerHelper* helper) {
   app_list::AppListSyncableService* app_service =
       app_list::AppListSyncableServiceFactory::GetForProfile(helper->profile());
   // Some unit tests may not have it.
   if (!app_service)
-    return std::vector<std::string>();
+    return std::vector<AppLauncherId>();
 
   std::vector<PinInfo> pin_infos;
 
@@ -597,8 +610,8 @@ std::vector<std::string> GetPinnedAppsFromPrefs(
       continue;
     }
 
-    pin_infos.push_back(
-        PinInfo(sync_peer.first, sync_peer.second->item_pin_ordinal));
+    pin_infos.push_back(PinInfo(AppLauncherId(sync_peer.first),
+                                sync_peer.second->item_pin_ordinal));
   }
 
   if (first_run) {
@@ -612,10 +625,10 @@ std::vector<std::string> GetPinnedAppsFromPrefs(
 
   // Pinned by policy apps appear first, if they were not shown before.
   syncer::StringOrdinal front_position = GetFirstPinPosition(helper->profile());
-  std::vector<std::string>::const_reverse_iterator it;
+  std::vector<AppLauncherId>::const_reverse_iterator it;
   for (it = policy_apps.app_list().rbegin();
        it != policy_apps.app_list().rend(); ++it) {
-    const std::string& app_id = *it;
+    const std::string& app_id = (*it).ToString();
     if (app_id == kPinnedAppsPlaceholder)
       continue;
 
@@ -624,15 +637,17 @@ std::vector<std::string> GetPinnedAppsFromPrefs(
       continue;
 
     // Now move it to the front.
-    pin_infos.insert(pin_infos.begin(), PinInfo(app_id, front_position));
+    pin_infos.insert(pin_infos.begin(),
+                     PinInfo(AppLauncherId(app_id), front_position));
     app_service->SetPinPosition(app_id, front_position);
     front_position = front_position.CreateBefore();
   }
 
   // Now insert Chrome browser app if needed.
   if (!app_service->GetPinPosition(extension_misc::kChromeAppId).IsValid()) {
-    pin_infos.insert(pin_infos.begin(),
-                     PinInfo(extension_misc::kChromeAppId, front_position));
+    pin_infos.insert(
+        pin_infos.begin(),
+        PinInfo(AppLauncherId(extension_misc::kChromeAppId), front_position));
     app_service->SetPinPosition(extension_misc::kChromeAppId, front_position);
   }
 
@@ -641,35 +656,39 @@ std::vector<std::string> GetPinnedAppsFromPrefs(
       const syncer::StringOrdinal arc_host_position =
           GetLastPinPosition(helper->profile());
       pin_infos.insert(pin_infos.begin(),
-                       PinInfo(ArcSupportHost::kHostAppId, arc_host_position));
+                       PinInfo(AppLauncherId(ArcSupportHost::kHostAppId),
+                               arc_host_position));
       app_service->SetPinPosition(ArcSupportHost::kHostAppId,
                                   arc_host_position);
     }
   }
 
-  // Convert to string array.
-  std::vector<std::string> pins(pin_infos.size());
+  // Convert to AppLauncherId array.
+  std::vector<AppLauncherId> pins;
   for (size_t i = 0; i < pin_infos.size(); ++i)
-    pins[i] = pin_infos[i].app_id;
+    pins.push_back(pin_infos[i].app_launcher_id);

[stevenjb, 2016/10/13 17:59:15]

nit: the previous method of presizing the vector was slightly more optimal since
it doesn't require additional allocations, was there a reason you changed that?

[Andra Paraschiv, 2016/10/14 12:09:17]

Thanks for this, I will revert to the previous method. This was changed before
being able to copy and store AppLauncherId.

 
   return pins;
 }
 
-void RemovePinPosition(Profile* profile, const std::string& app_id) {
+void RemovePinPosition(Profile* profile, const AppLauncherId& app_launcher_id) {
   DCHECK(profile);
-  DCHECK(!app_id.empty());
+  const std::string launcher_id = app_launcher_id.ToString();
+  DCHECK(!launcher_id.empty());

[stevenjb, 2016/10/13 17:59:15]

We shouldn't convert app_launcher_id to a string just to maintain this DCHECK,
it makes the rest of the code more confusing. Instead:
1) Remove the above two lines.
2) Use launcher_id.ToString() in the SetPinPosition call below.
3) In the AppLauncherId constructors, add DCHECK(!app_id.empty()), and add a
comment in the header that |app_id| must not be empty. Then we can always
guarantee that any AppLauncherId is valid.

[Andra Paraschiv, 2016/10/14 12:09:17]

We could remove this check and add it to the constructor in the majority of
cases, but there are some places where the app_launcher_id_str is not checked if
empty e.g. app_launcher_id_before_str from SetPinPosition or in the pins vector
init from GetPinnedAppsFromPrefs.

Should we add an AppLauncherId empty constructor? 

   app_list::AppListSyncableService* app_service =
       app_list::AppListSyncableServiceFactory::GetForProfile(profile);
-  app_service->SetPinPosition(app_id, syncer::StringOrdinal());
+  app_service->SetPinPosition(launcher_id, syncer::StringOrdinal());
 }
 
 void SetPinPosition(Profile* profile,
-                    const std::string& app_id,
-                    const std::string& app_id_before,
-                    const std::vector<std::string>& app_ids_after) {
+                    const AppLauncherId& app_launcher_id,
+                    const AppLauncherId& app_launcher_id_before,
+                    const std::vector<AppLauncherId>& app_launcher_ids_after) {
   DCHECK(profile);
-  DCHECK(!app_id.empty());
-  DCHECK_NE(app_id, app_id_before);
+  const std::string launcher_id = app_launcher_id.ToString();
+  DCHECK(!launcher_id.empty());

[stevenjb, 2016/10/13 17:59:15]

DCHECK not needed, see above.

+  const std::string launcher_id_before = app_launcher_id_before.ToString();
+  DCHECK_NE(launcher_id, launcher_id_before);

[stevenjb, 2016/10/13 17:59:15]

nit: Maybe name these app_launcher_id_str and app_launcher_id_before_str.
"launcher_id" is too close to "launch_id".

[Andra Paraschiv, 2016/10/14 12:09:17]

Done.

 
   app_list::AppListSyncableService* app_service =
       app_list::AppListSyncableServiceFactory::GetForProfile(profile);
@@ -678,16 +697,19 @@ void SetPinPosition(Profile* profile,
     return;
 
   syncer::StringOrdinal position_before =
-      app_id_before.empty() ? syncer::StringOrdinal()
-                            : app_service->GetPinPosition(app_id_before);
+      launcher_id_before.empty()
+          ? syncer::StringOrdinal()
+          : app_service->GetPinPosition(launcher_id_before);
   syncer::StringOrdinal position_after;
-  for (const auto& app_id_after : app_ids_after) {
-    DCHECK_NE(app_id_after, app_id);
-    DCHECK_NE(app_id_after, app_id_before);
-    syncer::StringOrdinal position = app_service->GetPinPosition(app_id_after);
+  for (const auto& app_launcher_id_after : app_launcher_ids_after) {
+    const std::string launcher_id_after = app_launcher_id_after.ToString();
+    DCHECK_NE(launcher_id_after, launcher_id);
+    DCHECK_NE(launcher_id_after, launcher_id_before);
+    syncer::StringOrdinal position =
+        app_service->GetPinPosition(launcher_id_after);
     DCHECK(position.IsValid());
     if (!position.IsValid()) {
-      LOG(ERROR) << "Sync pin position was not found for " << app_id_after;
+      LOG(ERROR) << "Sync pin position was not found for " << launcher_id_after;
       continue;
     }
     if (!position_before.IsValid() || !position.Equals(position_before)) {
@@ -705,7 +727,7 @@ void SetPinPosition(Profile* profile,
     pin_position = position_after.CreateBefore();
   else
     pin_position = syncer::StringOrdinal::CreateInitialOrdinal();
-  app_service->SetPinPosition(app_id, pin_position);
+  app_service->SetPinPosition(launcher_id, pin_position);
 }
 
 }  // namespace launcher