Move browsing data counters helper functions to an 'utils' file.

chrome/browser/browsing_data/browsing_data_counter_utils.cc

+// Copyright 2015 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.
+
+#include "chrome/browser/browsing_data/browsing_data_counter_utils.h"
+
+#include "base/command_line.h"
+#include "base/prefs/pref_service.h"
+#include "chrome/browser/browsing_data/autofill_counter.h"
+#include "chrome/browser/browsing_data/cache_counter.h"
+#include "chrome/browser/browsing_data/history_counter.h"
+#include "chrome/browser/browsing_data/passwords_counter.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/grit/generated_resources.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/text/bytes_formatting.h"
+
+bool AreCountersEnabled() {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableClearBrowsingDataCounters)) {
+    return true;
+  }
+
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kDisableClearBrowsingDataCounters)) {
+    return false;
+  }
+
+  // Enabled by default on desktop. Disabled on Android until the feature
+  // is finished.
+#if defined(OS_ANDROID)
+  return false;
+#else
+  return true;
+#endif
+}
+
+// A helper function to display the size of cache in units of MB or higher.
+// We need this, as 1 MB is the lowest nonzero cache size displayed by the
+// counter.
+base::string16 FormatBytesMBOrHigher(BrowsingDataCounter::ResultInt bytes) {
+  if (ui::GetByteDisplayUnits(bytes) >= ui::DataUnits::DATA_UNITS_MEBIBYTE)
+    return ui::FormatBytes(bytes);
+
+  return ui::FormatBytesWithUnits(
+      bytes, ui::DataUnits::DATA_UNITS_MEBIBYTE, true);
+}
+
+base::string16 GetCounterTextFromResult(
+    const BrowsingDataCounter::Result* result) {
+  base::string16 text;
+  std::string pref_name = result->source()->GetPrefName();
+
+  if (!result->Finished()) {
+    // The counter is still counting.
+    text = l10n_util::GetStringUTF16(IDS_CLEAR_BROWSING_DATA_CALCULATING);
+
+  } else if (pref_name == prefs::kDeletePasswords) {
+    // Passwords counter.
+    BrowsingDataCounter::ResultInt passwords_count =
+        static_cast<const BrowsingDataCounter::FinishedResult*>(
+            result)->Value();
+    text = l10n_util::GetPluralStringFUTF16(
+        IDS_DEL_PASSWORDS_COUNTER, passwords_count);
+
+  } else if (pref_name == prefs::kDeleteCache) {
+    // Cache counter.
+    BrowsingDataCounter::ResultInt cache_size_bytes =
+        static_cast<const BrowsingDataCounter::FinishedResult*>(
+            result)->Value();
+
+    PrefService* prefs = result->source()->GetProfile()->GetPrefs();
+    BrowsingDataRemover::TimePeriod time_period =
+        static_cast<BrowsingDataRemover::TimePeriod>(
+            prefs->GetInteger(prefs::kDeleteTimePeriod));
+
+    // Three cases: Nonzero result for the entire cache, nonzero result for
+    // a subset of cache (i.e. a finite time interval), and almost zero (< 1MB).
+    static const int kBytesInAMegabyte = 1024 * 1024;
+    if (cache_size_bytes >= kBytesInAMegabyte) {
+      base::string16 formatted_size = FormatBytesMBOrHigher(cache_size_bytes);
+      text = time_period == BrowsingDataRemover::EVERYTHING
+          ? formatted_size
+          : l10n_util::GetStringFUTF16(IDS_DEL_CACHE_COUNTER_UPPER_ESTIMATE,
+                                       formatted_size);
+    } else {
+      text = l10n_util::GetStringUTF16(IDS_DEL_CACHE_COUNTER_ALMOST_EMPTY);
+    }
+
+  } else if (pref_name == prefs::kDeleteBrowsingHistory) {
+    // History counter.
+    const HistoryCounter::HistoryResult* history_result =
+        static_cast<const HistoryCounter::HistoryResult*>(result);
+    BrowsingDataCounter::ResultInt local_item_count = history_result->Value();
+    bool has_synced_visits = history_result->has_synced_visits();
+
+    text = has_synced_visits
+        ? l10n_util::GetPluralStringFUTF16(
+              IDS_DEL_BROWSING_HISTORY_COUNTER_SYNCED, local_item_count)
+        : l10n_util::GetPluralStringFUTF16(
+              IDS_DEL_BROWSING_HISTORY_COUNTER, local_item_count);
+
+  } else if (pref_name == prefs::kDeleteFormData) {
+    // Autofill counter.
+    const AutofillCounter::AutofillResult* autofill_result =
+        static_cast<const AutofillCounter::AutofillResult*>(result);
+    AutofillCounter::ResultInt num_suggestions = autofill_result->Value();
+    AutofillCounter::ResultInt num_credit_cards =
+        autofill_result->num_credit_cards();
+    AutofillCounter::ResultInt num_addresses = autofill_result->num_addresses();
+
+    std::vector<base::string16> displayed_strings;
+
+    if (num_credit_cards) {
+      displayed_strings.push_back(l10n_util::GetPluralStringFUTF16(
+          IDS_DEL_AUTOFILL_COUNTER_CREDIT_CARDS, num_credit_cards));
+    }
+    if (num_addresses) {
+      displayed_strings.push_back(l10n_util::GetPluralStringFUTF16(
+          IDS_DEL_AUTOFILL_COUNTER_ADDRESSES, num_addresses));
+    }
+    if (num_suggestions) {
+      // We use a different wording for autocomplete suggestions based on the
+      // length of the entire string.
+      switch (displayed_strings.size()) {
+        case 0:
+          displayed_strings.push_back(l10n_util::GetPluralStringFUTF16(
+              IDS_DEL_AUTOFILL_COUNTER_SUGGESTIONS, num_suggestions));
+          break;
+        case 1:
+          displayed_strings.push_back(l10n_util::GetPluralStringFUTF16(
+              IDS_DEL_AUTOFILL_COUNTER_SUGGESTIONS_LONG, num_suggestions));
+          break;
+        case 2:
+          displayed_strings.push_back(l10n_util::GetPluralStringFUTF16(
+              IDS_DEL_AUTOFILL_COUNTER_SUGGESTIONS_SHORT, num_suggestions));
+          break;
+        default:
+          NOTREACHED();
+      }
+    }
+
+    // Construct the resulting string from the sections in |displayed_strings|.
+    switch (displayed_strings.size()) {
+      case 0:
+        text = l10n_util::GetStringUTF16(IDS_DEL_AUTOFILL_COUNTER_EMPTY);
+        break;
+      case 1:
+        text = displayed_strings[0];
+        break;
+      case 2:
+        text = l10n_util::GetStringFUTF16(IDS_DEL_AUTOFILL_COUNTER_TWO_TYPES,
+                                          displayed_strings[0],
+                                          displayed_strings[1]);
+        break;
+      case 3:
+        text = l10n_util::GetStringFUTF16(IDS_DEL_AUTOFILL_COUNTER_THREE_TYPES,
+                                          displayed_strings[0],
+                                          displayed_strings[1],
+                                          displayed_strings[2]);
+        break;
+      default:
+        NOTREACHED();
+    }
+  }
+
+  return text;
+}
+
+BrowsingDataCounter* CreateCounterForPreference(std::string pref_name) {
+  if (!AreCountersEnabled())
+    return nullptr;
+
+  if (pref_name == prefs::kDeleteBrowsingHistory)
+    return new HistoryCounter();
+  if (pref_name == prefs::kDeleteCache)
+    return new CacheCounter();
+  if (pref_name == prefs::kDeletePasswords)
+    return new PasswordsCounter();
+  if (pref_name == prefs::kDeleteFormData)
+    return new AutofillCounter();
+
+  return nullptr;
+}