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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_POLICY_CORE_COMMON_REGISTRY_DICT_H_
#define COMPONENTS_POLICY_CORE_COMMON_REGISTRY_DICT_H_
#include <map>
#include <memory>
#include <optional>
#include <string>
#include "build/build_config.h"
#include "components/policy/policy_export.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#endif
namespace base {
class Value;
}
namespace policy {
class Schema;
// Converts a value (as read from the registry) to meet |schema|, converting
// types as necessary. Unconvertible types will show up as null values in the
// result.
std::optional<base::Value> POLICY_EXPORT
ConvertRegistryValue(const base::Value& value, const Schema& schema);
// A case-insensitive string comparison functor.
struct POLICY_EXPORT CaseInsensitiveStringCompare {
bool operator()(const std::string& a, const std::string& b) const;
};
// In-memory representation of a registry subtree. Using a
// base::Value::Dict directly seems tempting, but that doesn't handle the
// registry's case-insensitive-but-case-preserving semantics properly.
class POLICY_EXPORT RegistryDict {
public:
using KeyMap = std::map<std::string,
std::unique_ptr<RegistryDict>,
CaseInsensitiveStringCompare>;
using ValueMap =
std::map<std::string, base::Value, CaseInsensitiveStringCompare>;
RegistryDict();
RegistryDict(const RegistryDict&) = delete;
RegistryDict& operator=(const RegistryDict&) = delete;
~RegistryDict();
// Returns a pointer to an existing key, NULL if not present.
RegistryDict* GetKey(const std::string& name);
const RegistryDict* GetKey(const std::string& name) const;
// Sets a key. If |dict| is NULL, clears that key.
void SetKey(const std::string& name, std::unique_ptr<RegistryDict> dict);
// Removes a key. If the key doesn't exist, NULL is returned.
std::unique_ptr<RegistryDict> RemoveKey(const std::string& name);
// Clears all keys.
void ClearKeys();
// Returns a pointer to a value, NULL if not present.
base::Value* GetValue(const std::string& name);
const base::Value* GetValue(const std::string& name) const;
// Sets a value.
void SetValue(const std::string& name, base::Value&& value);
// Removes a value. If the value doesn't exist, nullopt is returned.
std::optional<base::Value> RemoveValue(const std::string& name);
// Clears all values.
void ClearValues();
// Merge keys and values from |other|, giving precedence to |other|.
void Merge(const RegistryDict& other);
// Swap with |other|.
void Swap(RegistryDict* other);
#if BUILDFLAG(IS_WIN)
// Read a Windows registry subtree into this registry dictionary object.
void ReadRegistry(HKEY hive, const std::wstring& root);
// Converts the dictionary to base::Value representation. For key/value name
// collisions, the key wins. |schema| is used to determine the expected type
// for each policy.
// The underlying data of the returned object is either a base::Value::Dict or
// a base::Value::List.
std::optional<base::Value> ConvertToJSON(const class Schema& schema) const;
#endif
const KeyMap& keys() const { return keys_; }
const ValueMap& values() const { return values_; }
private:
KeyMap keys_;
ValueMap values_;
};
} // namespace policy
#endif // COMPONENTS_POLICY_CORE_COMMON_REGISTRY_DICT_H_
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