components/policy/core/common/registry_dict_win.h

   1 // Copyright 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 COMPONENTS_POLICY_CORE_COMMON_REGISTRY_DICT_WIN_H_
   6 #define COMPONENTS_POLICY_CORE_COMMON_REGISTRY_DICT_WIN_H_
   7
   8 #include <windows.h>
   9
  10 #include <map>
  11 #include <string>
  12
  13 #include "base/basictypes.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/strings/string16.h"
  16 #include "components/policy/policy_export.h"
  17
  18 namespace base {
  19 class Value;
  20 }
  21
  22 namespace policy {
  23
  24 class Schema;
  25
  26 // A case-insensitive string comparison functor.
  27 struct POLICY_EXPORT CaseInsensitiveStringCompare {
  28   bool operator()(const std::string& a, const std::string& b) const;
  29 };
  30
  31 // In-memory representation of a registry subtree. Using a
  32 // base::DictionaryValue directly seems tempting, but that doesn't handle the
  33 // registry's case-insensitive-but-case-preserving semantics properly.
  34 class POLICY_EXPORT RegistryDict {
  35  public:
  36   typedef std::map<std::string, RegistryDict*,
  37       CaseInsensitiveStringCompare> KeyMap;
  38   typedef std::map<std::string, base::Value*,
  39       CaseInsensitiveStringCompare> ValueMap;
  40
  41   RegistryDict();
  42   ~RegistryDict();
  43
  44   // Returns a pointer to an existing key, NULL if not present.
  45   RegistryDict* GetKey(const std::string& name);
  46   const RegistryDict* GetKey(const std::string& name) const;
  47   // Sets a key. If |dict| is NULL, clears that key.
  48   void SetKey(const std::string& name, scoped_ptr<RegistryDict> dict);
  49   // Removes a key. If the key doesn't exist, NULL is returned.
  50   scoped_ptr<RegistryDict> RemoveKey(const std::string& name);
  51   // Clears all keys.
  52   void ClearKeys();
  53
  54   // Returns a pointer to a value, NULL if not present.
  55   base::Value* GetValue(const std::string& name);
  56   const base::Value* GetValue(const std::string& name) const;
  57   // Sets a value. If |value| is NULL, removes the value.
  58   void SetValue(const std::string& name, scoped_ptr<base::Value> value);
  59   // Removes a value. If the value doesn't exist, NULL is returned.
  60   scoped_ptr<base::Value> RemoveValue(const std::string& name);
  61   // Clears all values.
  62   void ClearValues();
  63
  64   // Merge keys and values from |other|, giving precedence to |other|.
  65   void Merge(const RegistryDict& other);
  66
  67   // Swap with |other|.
  68   void Swap(RegistryDict* other);
  69
  70   // Read a Windows registry subtree into this registry dictionary object.
  71   void ReadRegistry(HKEY hive, const base::string16& root);
  72
  73   // Converts the dictionary to base::Value representation. For key/value name
  74   // collisions, the key wins. |schema| is used to determine the expected type
  75   // for each policy.
  76   // The returned object is either a base::DictionaryValue or a base::ListValue.
  77   scoped_ptr<base::Value> ConvertToJSON(const Schema& schema) const;
  78
  79   const KeyMap& keys() const { return keys_; }
  80   const ValueMap& values() const { return values_; }
  81
  82  private:
  83   KeyMap keys_;
  84   ValueMap values_;
  85
  86   DISALLOW_COPY_AND_ASSIGN(RegistryDict);
  87 };
  88
  89 }  // namespace policy
  90
  91 #endif  // COMPONENTS_POLICY_CORE_COMMON_REGISTRY_DICT_WIN_H_