Added HistoryService::GetHistoryCount() and helper functions in components/history

components/history/core/browser/visit_database.cc

 // 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.
 
 #include "components/history/core/browser/visit_database.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <set>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/time/time.h"
 #include "components/history/core/browser/url_database.h"
 #include "components/history/core/browser/visit_filter.h"
 #include "sql/statement.h"
 #include "ui/base/page_transition_types.h"
 #include "url/url_constants.h"
 
 namespace history {
 
 VisitDatabase::VisitDatabase() {
 }
@@ skipping 505 matching lines @@
   }
 
   if (!statement.Succeeded())
     return false;
 
   *first_visit = base::Time::FromInternalValue(statement.ColumnInt64(0));
   *count = statement.ColumnInt(1);
   return true;
 }
 
+bool VisitDatabase::GetHistoryCount(int* count) {
+  sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
+      "SELECT COUNT(*) FROM ("
+      "SELECT DISTINCT url, "
+      // Convert unit of timestamp from the numbers of microseconds since
+      // Windows Epoch to the number of seconds from Unix Epoch. Leap seconds
+      // are not handled in both timestamp units, so a linear conversion is
+      // valid here.
+      "DATE((visit_time - ?) / ?, 'unixepoch', 'localtime') "
+      "FROM visits "
+      "WHERE (transition & ?) != 0 "  // CHAIN_END
+      "AND (transition & ?) NOT IN (?, ?, ?)"  // NO SUBFRAME or
+                                               // KEYWORD_GENERATED
+      ")"));
+
+  statement.BindInt64(0, base::Time::kTimeTToMicrosecondsOffset);
+  statement.BindInt64(1, base::Time::kMicrosecondsPerSecond);
+  statement.BindInt(2, ui::PAGE_TRANSITION_CHAIN_END);
+  statement.BindInt(3, ui::PAGE_TRANSITION_CORE_MASK);
+  statement.BindInt(4, ui::PAGE_TRANSITION_AUTO_SUBFRAME);
+  statement.BindInt(5, ui::PAGE_TRANSITION_MANUAL_SUBFRAME);
+  statement.BindInt(6, ui::PAGE_TRANSITION_KEYWORD_GENERATED);
+
+  if (!statement.Step())
+    return false;
+
+  *count = statement.ColumnInt(0);
+  return true;
+}
+
 bool VisitDatabase::GetStartDate(base::Time* first_visit) {
   sql::Statement statement(GetDB().GetCachedStatement(SQL_FROM_HERE,
       "SELECT MIN(visit_time) FROM visits WHERE visit_time != 0"));
   if (!statement.Step() || statement.ColumnInt64(0) == 0) {
     *first_visit = base::Time::Now();
     return false;
   }
   *first_visit = base::Time::FromInternalValue(statement.ColumnInt64(0));
   return true;
 }
@@ skipping 44 matching lines @@
     // Old versions don't have the visit_duration column, we modify the table
     // to add that field.
     if (!GetDB().Execute("ALTER TABLE visits "
         "ADD COLUMN visit_duration INTEGER DEFAULT 0 NOT NULL"))
       return false;
   }
   return true;
 }
 
 }  // namespace history