Move policy code into components/policy.

chrome/browser/policy/cloud/resource_cache.h

-// Copyright (c) 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_POLICY_CLOUD_RESOURCE_CACHE_H_
-#define CHROME_BROWSER_POLICY_CLOUD_RESOURCE_CACHE_H_
-
-#include <map>
-#include <set>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/callback_forward.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace policy {
-
-// Manages storage of data at a given path. The data is keyed by a key and
-// a subkey, and can be queried by (key, subkey) or (key) lookups.
-// The contents of the cache have to be manually cleared using Delete() or
-// Purge*().
-// The class can be instantiated on any thread but from then on, it must be
-// accessed via the |task_runner| only. The |task_runner| must support file I/O.
-class ResourceCache {
- public:
-  explicit ResourceCache(const base::FilePath& cache_path,
-                         scoped_refptr<base::SequencedTaskRunner> task_runner);
-  virtual ~ResourceCache();
-
-  // Stores |data| under (key, subkey). Returns true if the store suceeded, and
-  // false otherwise.
-  bool Store(const std::string& key,
-             const std::string& subkey,
-             const std::string& data);
-
-  // Loads the contents of (key, subkey) into |data| and returns true. Returns
-  // false if (key, subkey) isn't found or if there is a problem reading the
-  // data.
-  bool Load(const std::string& key,
-            const std::string& subkey,
-            std::string* data);
-
-  // Loads all the subkeys of |key| into |contents|.
-  void LoadAllSubkeys(const std::string& key,
-                      std::map<std::string, std::string>* contents);
-
-  // Deletes (key, subkey).
-  void Delete(const std::string& key, const std::string& subkey);
-
-  // Deletes all the subkeys of |key|.
-  void Clear(const std::string& key);
-
-  // Deletes the subkeys of |key| for which the |filter| returns true.
-  typedef base::Callback<bool(const std::string&)> SubkeyFilter;
-  void FilterSubkeys(const std::string& key, const SubkeyFilter& filter);
-
-  // Deletes all keys not in |keys_to_keep|, along with their subkeys.
-  void PurgeOtherKeys(const std::set<std::string>& keys_to_keep);
-
-  // Deletes all the subkeys of |key| not in |subkeys_to_keep|.
-  void PurgeOtherSubkeys(const std::string& key,
-                         const std::set<std::string>& subkeys_to_keep);
-
- private:
-  // Points |path| at the cache directory for |key| and returns whether the
-  // directory exists. If |allow_create| is |true|, the directory is created if
-  // it did not exist yet.
-  bool VerifyKeyPath(const std::string& key,
-                     bool allow_create,
-                     base::FilePath* path);
-
-  // Points |path| at the file in which data for (key, subkey) should be stored
-  // and returns whether the parent directory of this file exists. If
-  // |allow_create_key| is |true|, the directory is created if it did not exist
-  // yet. This method does not check whether the file at |path| exists or not.
-  bool VerifyKeyPathAndGetSubkeyPath(const std::string& key,
-                                     bool allow_create_key,
-                                     const std::string& subkey,
-                                     base::FilePath* subkey_path);
-
-  base::FilePath cache_dir_;
-
-  // Task runner that |this| runs on.
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(ResourceCache);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_CLOUD_RESOURCE_CACHE_H_