Start migrating the disk cache to using FilePath.

net/disk_cache/backend_impl.h

 // Copyright (c) 2006-2008 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.
 
 // See net/disk_cache/disk_cache.h for the public interface of the cache.
 
 #ifndef NET_DISK_CACHE_BACKEND_IMPL_H_
 #define NET_DISK_CACHE_BACKEND_IMPL_H_
 
+#include "base/file_path.h"
 #include "base/hash_tables.h"
 #include "base/timer.h"
 #include "net/disk_cache/block_files.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/disk_cache/eviction.h"
 #include "net/disk_cache/rankings.h"
 #include "net/disk_cache/stats.h"
 #include "net/disk_cache/trace.h"
 
 namespace disk_cache {
 
 enum BackendFlags {
   kNone = 0,
   kMask = 1,                    // A mask (for the index table) was specified.
   kMaxSize = 1 << 1,            // A maximum size was provided.
   kUnitTestMode = 1 << 2,       // We are modifying the behavior for testing.
   kUpgradeMode = 1 << 3,        // This is the upgrade tool (dump).
   kNewEviction = 1 << 4,        // Use of new eviction was specified.
   kNoRandom = 1 << 5,           // Don't add randomness to the behavior.
   kNoLoadProtection = 1 << 6    // Don't act conservatively under load.
 };
 
 // This class implements the Backend interface. An object of this
 // class handles the operations of the cache for a particular profile.
 class BackendImpl : public Backend {
   friend class Eviction;
  public:
-  explicit BackendImpl(const std::wstring& path)
-      : path_(path), block_files_(path), mask_(0), max_size_(0),
+  explicit BackendImpl(const FilePath& path)
+      : path_(path), block_files_(path.ToWStringHack()), mask_(0), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(0),
         init_(false), restarted_(false), unit_test_(false), read_only_(false),
         new_eviction_(false), first_timer_(true),
         ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
   // mask can be used to limit the usable size of the hash table, for testing.
-  BackendImpl(const std::wstring& path, uint32 mask)
-      : path_(path), block_files_(path), mask_(mask), max_size_(0),
+  BackendImpl(const FilePath& path, uint32 mask)
+      : path_(path), block_files_(path.ToWStringHack()), mask_(mask), max_size_(0),
         cache_type_(net::DISK_CACHE), uma_report_(0), user_flags_(kMask),
         init_(false), restarted_(false), unit_test_(false), read_only_(false),
         new_eviction_(false), first_timer_(true),
         ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
   ~BackendImpl();
 
   // Returns a new backend with the desired flags. See the declaration of
   // CreateCacheBackend().
   static Backend* CreateBackend(const std::wstring& full_path, bool force,
                                 int max_bytes, net::CacheType type,
@@ skipping 15 matching lines @@
   virtual void EndEnumeration(void** iter);
   virtual void GetStats(StatsItems* stats);
 
   // Sets the maximum size for the total amount of data stored by this instance.
   bool SetMaxSize(int max_bytes);
 
   // Sets the cache type for this backend.
   void SetType(net::CacheType type);
 
   // Returns the full name for an external storage file.
-  std::wstring GetFileName(Addr address) const;
+  FilePath GetFileName(Addr address) const;
 
   // Returns the actual file used to store a given (non-external) address.
   MappedFile* File(Addr address);
 
   // Creates an external storage file.
   bool CreateExternalFile(Addr* address);
 
   // Creates a new storage block of size block_count.
   bool CreateBlock(FileType block_type, int block_count,
                    Addr* block_address);
@@ skipping 163 matching lines @@
   // Performs basic checks on the index file. Returns false on failure.
   bool CheckIndex();
 
   // Part of the selt test. Returns the number or dirty entries, or an error.
   int CheckAllEntries();
 
   // Part of the self test. Returns false if the entry is corrupt.
   bool CheckEntry(EntryImpl* cache_entry);
 
   scoped_refptr<MappedFile> index_;  // The main cache index.
-  std::wstring path_;  // Path to the folder used as backing storage.
+  FilePath path_;  // Path to the folder used as backing storage.
   Index* data_;  // Pointer to the index data.
   BlockFiles block_files_;  // Set of files used to store all data.
   Rankings rankings_;  // Rankings to be able to trim the cache.
   uint32 mask_;  // Binary mask to map a hash to the hash table.
   int32 max_size_;  // Maximum data size for this instance.
   Eviction eviction_;  // Handler of the eviction algorithm.
   EntriesMap open_entries_;  // Map of open entries.
   int num_refs_;  // Number of referenced cache entries.
   int max_refs_;  // Max number of referenced cache entries.
   int num_pending_io_;  // Number of pending IO operations.
@@ skipping 15 matching lines @@
 
   DISALLOW_EVIL_CONSTRUCTORS(BackendImpl);
 };
 
 // Returns the prefered max cache size given the available disk space.
 int PreferedCacheSize(int64 available);
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BACKEND_IMPL_H_