Move chrome/browser/chromeos/drive/resource* (+deps) into components/drive.

chrome/browser/chromeos/drive/resource_metadata_storage.h

-// Copyright 2013 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_STORAGE_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_STORAGE_H_
-
-#include <string>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "components/drive/drive.pb.h"
-#include "components/drive/file_errors.h"
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace leveldb {
-class DB;
-class Iterator;
-}
-
-namespace drive {
-
-class ResourceEntry;
-class ResourceMetadataHeader;
-
-namespace internal {
-
-// Storage for ResourceMetadata which is responsible to manage resource
-// entries and child-parent relationships between entries.
-class ResourceMetadataStorage {
- public:
-  // This should be incremented when incompatibility change is made to DB
-  // format.
-  static const int kDBVersion = 13;
-
-  // Object to iterate over entries stored in this storage.
-  class Iterator {
-   public:
-    explicit Iterator(scoped_ptr<leveldb::Iterator> it);
-    ~Iterator();
-
-    // Returns true if this iterator cannot advance any more and does not point
-    // to a valid entry. Get() and Advance() should not be called in such cases.
-    bool IsAtEnd() const;
-
-    // Returns the ID of the entry currently pointed by this object.
-    std::string GetID() const;
-
-    // Returns the entry currently pointed by this object.
-    const ResourceEntry& GetValue() const;
-
-    // Advances to the next entry.
-    void Advance();
-
-    // Returns true if this object has encountered any error.
-    bool HasError() const;
-
-   private:
-    ResourceEntry entry_;
-    scoped_ptr<leveldb::Iterator> it_;
-
-    DISALLOW_COPY_AND_ASSIGN(Iterator);
-  };
-
-  // Cache information recovered from trashed DB.
-  struct RecoveredCacheInfo {
-    RecoveredCacheInfo();
-    ~RecoveredCacheInfo();
-
-    bool is_dirty;
-    std::string md5;
-    std::string title;
-  };
-  typedef std::map<std::string, RecoveredCacheInfo> RecoveredCacheInfoMap;
-
-  // Returns true if the DB was successfully upgraded to the newest version.
-  static bool UpgradeOldDB(const base::FilePath& directory_path);
-
-  ResourceMetadataStorage(const base::FilePath& directory_path,
-                          base::SequencedTaskRunner* blocking_task_runner);
-
-  const base::FilePath& directory_path() const { return directory_path_; }
-
-  // Returns true when cache entries were not loaded to the DB during
-  // initialization.
-  bool cache_file_scan_is_needed() const { return cache_file_scan_is_needed_; }
-
-  // Destroys this object.
-  void Destroy();
-
-  // Initializes this object.
-  bool Initialize();
-
-  // Collects cache info from trashed resource map DB.
-  void RecoverCacheInfoFromTrashedResourceMap(RecoveredCacheInfoMap* out_info);
-
-  // Sets the largest changestamp.
-  FileError SetLargestChangestamp(int64 largest_changestamp);
-
-  // Gets the largest changestamp.
-  FileError GetLargestChangestamp(int64* largest_changestamp);
-
-  // Puts the entry to this storage.
-  FileError PutEntry(const ResourceEntry& entry);
-
-  // Gets an entry stored in this storage.
-  FileError GetEntry(const std::string& id, ResourceEntry* out_entry);
-
-  // Removes an entry from this storage.
-  FileError RemoveEntry(const std::string& id);
-
-  // Returns an object to iterate over entries stored in this storage.
-  scoped_ptr<Iterator> GetIterator();
-
-  // Returns the ID of the parent's child.
-  FileError GetChild(const std::string& parent_id,
-                     const std::string& child_name,
-                     std::string* child_id);
-
-  // Returns the IDs of the parent's children.
-  FileError GetChildren(const std::string& parent_id,
-                        std::vector<std::string>* children);
-
-  // Returns the local ID associated with the given resource ID.
-  FileError GetIdByResourceId(const std::string& resource_id,
-                              std::string* out_id);
-
- private:
-  friend class ResourceMetadataStorageTest;
-
-  // To destruct this object, use Destroy().
-  ~ResourceMetadataStorage();
-
-  // Used to implement Destroy().
-  void DestroyOnBlockingPool();
-
-  // Returns a string to be used as a key for child entry.
-  static std::string GetChildEntryKey(const std::string& parent_id,
-                                      const std::string& child_name);
-
-  // Puts header.
-  FileError PutHeader(const ResourceMetadataHeader& header);
-
-  // Gets header.
-  FileError GetHeader(ResourceMetadataHeader* out_header);
-
-  // Checks validity of the data.
-  bool CheckValidity();
-
-  // Path to the directory where the data is stored.
-  base::FilePath directory_path_;
-
-  bool cache_file_scan_is_needed_;
-
-  // Entries stored in this storage.
-  scoped_ptr<leveldb::DB> resource_map_;
-
-  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(ResourceMetadataStorage);
-};
-
-}  // namespace internal
-}  // namespace drive
-
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_STORAGE_H_