Move PolicyMap and its dependencies to components/policy/.

chrome/browser/policy/policy_map.h

-// Copyright (c) 2012 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_POLICY_MAP_H_
-#define CHROME_BROWSER_POLICY_POLICY_MAP_H_
-
-#include <map>
-#include <set>
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/values.h"
-#include "chrome/browser/policy/external_data_fetcher.h"
-#include "chrome/browser/policy/policy_types.h"
-
-namespace policy {
-
-// A mapping of policy names to policy values for a given policy namespace.
-class PolicyMap {
- public:
-  // Each policy maps to an Entry which keeps the policy value as well as other
-  // relevant data about the policy.
-  struct Entry {
-    PolicyLevel level;
-    PolicyScope scope;
-    base::Value* value;
-    ExternalDataFetcher* external_data_fetcher;
-
-    Entry()
-        : level(POLICY_LEVEL_RECOMMENDED),
-          scope(POLICY_SCOPE_USER),
-          value(NULL),
-          external_data_fetcher(NULL) {}
-
-    // Returns true if |this| has higher priority than |other|.
-    bool has_higher_priority_than(const Entry& other) const;
-
-    // Returns true if |this| equals |other|.
-    bool Equals(const Entry& other) const;
-  };
-
-  typedef std::map<std::string, Entry> PolicyMapType;
-  typedef PolicyMapType::const_iterator const_iterator;
-
-  PolicyMap();
-  virtual ~PolicyMap();
-
-  // Returns a weak reference to the entry currently stored for key |policy|,
-  // or NULL if not found. Ownership is retained by the PolicyMap.
-  const Entry* Get(const std::string& policy) const;
-
-  // Returns a weak reference to the value currently stored for key |policy|,
-  // or NULL if not found. Ownership is retained by the PolicyMap.
-  // This is equivalent to Get(policy)->value, when it doesn't return NULL.
-  const base::Value* GetValue(const std::string& policy) const;
-
-  // Takes ownership of |value| and |external_data_fetcher|. Overwrites any
-  // existing information stored in the map for the key |policy|.
-  void Set(const std::string& policy,
-           PolicyLevel level,
-           PolicyScope scope,
-           base::Value* value,
-           ExternalDataFetcher* external_data_fetcher);
-
-  // Erase the given |policy|, if it exists in this map.
-  void Erase(const std::string& policy);
-
-  // Swaps the internal representation of |this| with |other|.
-  void Swap(PolicyMap* other);
-
-  // |this| becomes a copy of |other|. Any existing policies are dropped.
-  void CopyFrom(const PolicyMap& other);
-
-  // Returns a copy of |this|.
-  scoped_ptr<PolicyMap> DeepCopy() const;
-
-  // Merges policies from |other| into |this|. Existing policies are only
-  // overridden by those in |other| if they have a higher priority, as defined
-  // by Entry::has_higher_priority_than(). If a policy is contained in both
-  // maps with the same priority, the current value in |this| is preserved.
-  void MergeFrom(const PolicyMap& other);
-
-  // Loads the values in |policies| into this PolicyMap. All policies loaded
-  // will have |level| and |scope| in their entries. Existing entries are
-  // replaced.
-  void LoadFrom(const base::DictionaryValue* policies,
-                PolicyLevel level,
-                PolicyScope scope);
-
-  // Compares this value map against |other| and stores all key names that have
-  // different values or reference different external data in |differing_keys|.
-  // This includes keys that are present only in one of the maps.
-  // |differing_keys| is not cleared before the keys are added.
-  void GetDifferingKeys(const PolicyMap& other,
-                        std::set<std::string>* differing_keys) const;
-
-  // Removes all policies that don't have the specified |level|. This is a
-  // temporary helper method, until mandatory and recommended levels are served
-  // by a single provider.
-  // TODO(joaodasilva): Remove this. http://crbug.com/108999
-  void FilterLevel(PolicyLevel level);
-
-  bool Equals(const PolicyMap& other) const;
-  bool empty() const;
-  size_t size() const;
-
-  const_iterator begin() const;
-  const_iterator end() const;
-  void Clear();
-
- private:
-  // Helper function for Equals().
-  static bool MapEntryEquals(const PolicyMapType::value_type& a,
-                             const PolicyMapType::value_type& b);
-
-  PolicyMapType map_;
-
-  DISALLOW_COPY_AND_ASSIGN(PolicyMap);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_POLICY_MAP_H_