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
  17 namespace content {
  18
  19 class IndexedDBTransaction;
  20
  21 class CONTENT_EXPORT IndexedDBCursor
  22     : NON_EXPORTED_BASE(public base::RefCounted<IndexedDBCursor>) {
  23  public:
  24   IndexedDBCursor(scoped_ptr<IndexedDBBackingStore::Cursor> cursor,
  25                   indexed_db::CursorType cursor_type,
  26                   IndexedDBDatabase::TaskType task_type,
  27                   IndexedDBTransaction* transaction);
  28
  29   void Advance(uint32 count, scoped_refptr<IndexedDBCallbacks> callbacks);
  30   void Continue(scoped_ptr<IndexedDBKey> key,
  31                 scoped_ptr<IndexedDBKey> primary_key,
  32                 scoped_refptr<IndexedDBCallbacks> callbacks);
  33   void PrefetchContinue(int number_to_fetch,
  34                         scoped_refptr<IndexedDBCallbacks> callbacks);
  35   leveldb::Status PrefetchReset(int used_prefetches, int unused_prefetches);
  36
  37   const IndexedDBKey& key() const { return cursor_->key(); }
  38   const IndexedDBKey& primary_key() const { return cursor_->primary_key(); }
  39   IndexedDBValue* Value() const {
  40     return (cursor_type_ == indexed_db::CURSOR_KEY_ONLY) ? NULL
  41                                                          : cursor_->value();
  42   }
  43   void Close();
  44
  45   void CursorIterationOperation(scoped_ptr<IndexedDBKey> key,
  46                                 scoped_ptr<IndexedDBKey> primary_key,
  47                                 scoped_refptr<IndexedDBCallbacks> callbacks,
  48                                 IndexedDBTransaction* transaction);
  49   void CursorAdvanceOperation(uint32 count,
  50                               scoped_refptr<IndexedDBCallbacks> callbacks,
  51                               IndexedDBTransaction* transaction);
  52   void CursorPrefetchIterationOperation(
  53       int number_to_fetch,
  54       scoped_refptr<IndexedDBCallbacks> callbacks,
  55       IndexedDBTransaction* transaction);
  56
  57  private:
  58   friend class base::RefCounted<IndexedDBCursor>;
  59
  60   ~IndexedDBCursor();
  61
  62   IndexedDBDatabase::TaskType task_type_;
  63   indexed_db::CursorType cursor_type_;
  64   const scoped_refptr<IndexedDBTransaction> transaction_;
  65
  66   // Must be destroyed before transaction_.
  67   scoped_ptr<IndexedDBBackingStore::Cursor> cursor_;
  68   // Must be destroyed before transaction_.
  69   scoped_ptr<IndexedDBBackingStore::Cursor> saved_cursor_;
  70
  71   bool closed_;
  72 };
  73
  74 }  // namespace content
  75
  76 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_CURSOR_H_