content/browser/indexed_db/indexed_db_cursor.h

   1 // Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_
   6 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/ref_counted.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "content/browser/indexed_db/indexed_db_backing_store.h"
  14 #include "content/browser/indexed_db/indexed_db_database.h"
  15 #include "content/common/indexed_db/indexed_db_key_range.h"
  16 #include "third_party/WebKit/public/platform/WebIDBTypes.h"
  17
  18 namespace content {
  19
  20 class IndexedDBTransaction;
  21
  22 class CONTENT_EXPORT IndexedDBCursor
  23     : NON_EXPORTED_BASE(public base::RefCounted<IndexedDBCursor>) {
  24  public:
  25   IndexedDBCursor(scoped_ptr<IndexedDBBackingStore::Cursor> cursor,
  26                   indexed_db::CursorType cursor_type,
  27                   blink::WebIDBTaskType task_type,
  28                   IndexedDBTransaction* transaction);
  29
  30   void Advance(uint32 count, scoped_refptr<IndexedDBCallbacks> callbacks);
  31   void Continue(scoped_ptr<IndexedDBKey> key,
  32                 scoped_ptr<IndexedDBKey> primary_key,
  33                 scoped_refptr<IndexedDBCallbacks> callbacks);
  34   void PrefetchContinue(int number_to_fetch,
  35                         scoped_refptr<IndexedDBCallbacks> callbacks);
  36   leveldb::Status PrefetchReset(int used_prefetches, int unused_prefetches);
  37
  38   const IndexedDBKey& key() const { return cursor_->key(); }
  39   const IndexedDBKey& primary_key() const { return cursor_->primary_key(); }
  40   IndexedDBValue* Value() const {
  41     return (cursor_type_ == indexed_db::CURSOR_KEY_ONLY) ? NULL
  42                                                          : cursor_->value();
  43   }
  44   void Close();
  45
  46   void CursorIterationOperation(scoped_ptr<IndexedDBKey> key,
  47                                 scoped_ptr<IndexedDBKey> primary_key,
  48                                 scoped_refptr<IndexedDBCallbacks> callbacks,
  49                                 IndexedDBTransaction* transaction);
  50   void CursorAdvanceOperation(uint32 count,
  51                               scoped_refptr<IndexedDBCallbacks> callbacks,
  52                               IndexedDBTransaction* transaction);
  53   void CursorPrefetchIterationOperation(
  54       int number_to_fetch,
  55       scoped_refptr<IndexedDBCallbacks> callbacks,
  56       IndexedDBTransaction* transaction);
  57
  58  private:
  59   friend class base::RefCounted<IndexedDBCursor>;
  60
  61   ~IndexedDBCursor();
  62
  63   blink::WebIDBTaskType task_type_;
  64   indexed_db::CursorType cursor_type_;
  65   const scoped_refptr<IndexedDBTransaction> transaction_;
  66
  67   // Must be destroyed before transaction_.
  68   scoped_ptr<IndexedDBBackingStore::Cursor> cursor_;
  69   // Must be destroyed before transaction_.
  70   scoped_ptr<IndexedDBBackingStore::Cursor> saved_cursor_;
  71
  72   bool closed_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(IndexedDBCursor);
  75 };
  76
  77 }  // namespace content
  78
  79 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_