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Side by Side Diff: webkit/dom_storage/dom_storage_database.h

Issue 9159020: Create a class to represent a DOM Storage Database. (Closed) Base URL: http://git.chromium.org/chromium/src.git@master
Patch Set: Remove some unused includes. Created 8 years, 10 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef WEBKIT_DOM_STORAGE_DOM_STORAGE_DATABASE_H_
6 #define WEBKIT_DOM_STORAGE_DOM_STORAGE_DATABASE_H_
7
8 #include <map>
9
10 #include "base/file_path.h"
11 #include "base/gtest_prod_util.h"
12 #include "base/memory/scoped_ptr.h"
13 #include "base/nullable_string16.h"
14 #include "base/string16.h"
15 #include "sql/connection.h"
16
17 namespace dom_storage {
18
19 // Represents a SQLite based backing for DOM storage data. This
20 // class is designed to be used on a single thread.
21 class DomStorageDatabase {
22 public:
23 explicit DomStorageDatabase(const FilePath& file_path);
24
25 typedef std::map<string16, NullableString16> ValuesMap;
26
27 // Reads all the key, value pairs stored in the database and returns
28 // them. |result| is assumed to be empty and any duplicate keys will
29 // be overwritten. If the database exists on disk then it will be
30 // opened. If it does not exist then it will not be created and
31 // |result| will be unmodified.
32 void ReadAllValues(ValuesMap* result);
33
34 // Updates the backing database. Will remove all keys before updating
35 // the database if |clear_all_first| is set. Then all entries in
36 // |changes| will be examined - keys mapped to a null NullableString16
37 // will be removed and all others will be inserted/updated as appropriate.
38 bool CommitChanges(bool clear_all_first, const ValuesMap& changes);
39
40 private:
41 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, SimpleOpenAndClose);
42 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, TestLazyOpenIsLazy);
43 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest,
44 TestUpgradesV1TableToV2);
45 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, TestIsOpen);
46 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, SimpleRead);
47 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, SimpleWrite);
48 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, WriteWithClear);
49 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, UpgradeFromV1ToV2NoData);
50 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest,
51 UpgradeFromV1ToV2WithData);
52 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest,
53 TestOpenCloseDataPreserved);
54 FRIEND_TEST_ALL_PREFIXES(DomStorageDatabaseTest, TestSimpleRemoveOneValue);
55
56 // Open the database at file_path_ if it exists already and creates it if
57 // |create_if_needed| is true.
58 // Ensures we are at the correct database version and creates or updates
59 // tables as necessary. Returns false on failure.
60 bool LazyOpen(bool create_if_needed);
61
62 // Creates the ItemTable at the current version of the database.
63 bool CreateTable();
64 bool CreateTableV2();
65
66 // Version 1 -> 2 migrated the value column in the ItemTable from a TEXT
67 // to a BLOB. Exisitng data is preserved.
68 bool UpgradeVersion1To2IfNeeded();
69
70 void Close();
71 bool IsOpen() const { return db_.get() ? db_->is_open() : false; }
72
73 // Path to the database on disk.
74 FilePath file_path_;
75 scoped_ptr<sql::Connection> db_;
76 };
77
78 } // namespace dom_storage
79
80 #endif // WEBKIT_DOM_STORAGE_DOM_STORAGE_DATABASE_H_
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