Move c/b/webdata/ code to components/webdata/

chrome/browser/webdata/web_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 "chrome/browser/webdata/web_database.h"
-
-#include <algorithm>
-
-#include "base/stl_util.h"
-#include "content/public/browser/notification_service.h"
-#include "sql/statement.h"
-#include "sql/transaction.h"
-
-// Current version number.  Note: when changing the current version number,
-// corresponding changes must happen in the unit tests, and new migration test
-// added.  See |WebDatabaseMigrationTest::kCurrentTestedVersionNumber|.
-// static
-const int WebDatabase::kCurrentVersionNumber = 49;
-
-namespace {
-
-const int kCompatibleVersionNumber = 48;
-
-// Change the version number and possibly the compatibility version of
-// |meta_table_|.
-void ChangeVersion(sql::MetaTable* meta_table,
-                   int version_num,
-                   bool update_compatible_version_num) {
-  meta_table->SetVersionNumber(version_num);
-  if (update_compatible_version_num) {
-    meta_table->SetCompatibleVersionNumber(
-          std::min(version_num, kCompatibleVersionNumber));
-  }
-}
-
-// Outputs the failed version number as a warning and always returns
-// |sql::INIT_FAILURE|.
-sql::InitStatus FailedMigrationTo(int version_num) {
-  LOG(WARNING) << "Unable to update web database to version "
-               << version_num << ".";
-  NOTREACHED();
-  return sql::INIT_FAILURE;
-}
-
-}  // namespace
-
-WebDatabase::WebDatabase() {}
-
-WebDatabase::~WebDatabase() {
-}
-
-void WebDatabase::AddTable(WebDatabaseTable* table) {
-  tables_[table->GetTypeKey()] = table;
-}
-
-WebDatabaseTable* WebDatabase::GetTable(WebDatabaseTable::TypeKey key) {
-  return tables_[key];
-}
-
-void WebDatabase::BeginTransaction() {
-  db_.BeginTransaction();
-}
-
-void WebDatabase::CommitTransaction() {
-  db_.CommitTransaction();
-}
-
-sql::Connection* WebDatabase::GetSQLConnection() {
-  return &db_;
-}
-
-sql::InitStatus WebDatabase::Init(const base::FilePath& db_name) {
-  // When running in unit tests, there is already a NotificationService object.
-  // Since only one can exist at a time per thread, check first.
-  if (!content::NotificationService::current())
-    notification_service_.reset(content::NotificationService::Create());
-
-  db_.set_error_histogram_name("Sqlite.Web.Error");
-
-  // We don't store that much data in the tables so use a small page size.
-  // This provides a large benefit for empty tables (which is very likely with
-  // the tables we create).
-  db_.set_page_size(2048);
-
-  // We shouldn't have much data and what access we currently have is quite
-  // infrequent. So we go with a small cache size.
-  db_.set_cache_size(32);
-
-  // Run the database in exclusive mode. Nobody else should be accessing the
-  // database while we're running, and this will give somewhat improved perf.
-  db_.set_exclusive_locking();
-
-  if (!db_.Open(db_name))
-    return sql::INIT_FAILURE;
-
-  // Initialize various tables
-  sql::Transaction transaction(&db_);
-  if (!transaction.Begin())
-    return sql::INIT_FAILURE;
-
-  // Version check.
-  if (!meta_table_.Init(&db_, kCurrentVersionNumber, kCompatibleVersionNumber))
-    return sql::INIT_FAILURE;
-  if (meta_table_.GetCompatibleVersionNumber() > kCurrentVersionNumber) {
-    LOG(WARNING) << "Web database is too new.";
-    return sql::INIT_TOO_NEW;
-  }
-
-  // Initialize the tables.
-  for (TableMap::iterator it = tables_.begin();
-       it != tables_.end();
-       ++it) {
-    if (!it->second->Init(&db_, &meta_table_)) {
-      LOG(WARNING) << "Unable to initialize the web database.";
-      return sql::INIT_FAILURE;
-    }
-  }
-
-  // If the file on disk is an older database version, bring it up to date.
-  // If the migration fails we return an error to caller and do not commit
-  // the migration.
-  sql::InitStatus migration_status = MigrateOldVersionsAsNeeded();
-  if (migration_status != sql::INIT_OK)
-    return migration_status;
-
-  return transaction.Commit() ? sql::INIT_OK : sql::INIT_FAILURE;
-}
-
-sql::InitStatus WebDatabase::MigrateOldVersionsAsNeeded() {
-  // Some malware used to lower the version number, causing migration to
-  // fail. Ensure the version number is at least as high as the compatible
-  // version number.
-  int current_version = std::max(meta_table_.GetVersionNumber(),
-                                 meta_table_.GetCompatibleVersionNumber());
-  if (current_version > meta_table_.GetVersionNumber())
-    ChangeVersion(&meta_table_, current_version, false);
-
-  if (current_version < 20) {
-    // Versions 1 - 19 are unhandled.  Version numbers greater than
-    // kCurrentVersionNumber should have already been weeded out by the caller.
-    //
-    // When the version is too old, we return failure error code.  The schema
-    // is too out of date to migrate.
-    //
-    // There should not be a released product that makes a database too old to
-    // migrate. If we do encounter such a legacy database, we will need a
-    // better solution to handle it (i.e., pop up a dialog to tell the user,
-    // erase all their prefs and start over, etc.).
-    LOG(WARNING) << "Web database version " << current_version <<
-        " is too old to handle.";
-    NOTREACHED();
-    return sql::INIT_FAILURE;
-  }
-
-  for (int next_version = current_version + 1;
-       next_version <= kCurrentVersionNumber;
-       ++next_version) {
-    // Give each table a chance to migrate to this version.
-    for (TableMap::iterator it = tables_.begin();
-         it != tables_.end();
-         ++it) {
-      // Any of the tables may set this to true, but by default it is false.
-      bool update_compatible_version = false;
-      if (!it->second->MigrateToVersion(next_version,
-                                        &update_compatible_version)) {
-        return FailedMigrationTo(next_version);
-      }
-
-      ChangeVersion(&meta_table_, next_version, update_compatible_version);
-    }
-  }
-  return sql::INIT_OK;
-}