ConfigurationPolicyPrefStore refactoring to surface error messages.

chrome/browser/policy/configuration_policy_handler_interface.h

+// Copyright (c) 2011 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_CONFIGURATION_POLICY_HANDLER_INTERFACE_H_
+#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_INTERFACE_H_
+#pragma once
+
+class PrefValueMap;
+
+namespace policy {
+
+class PolicyErrorMap;
+class PolicyMap;
+
+// An abstract super class that subclasses should implement to map a policy
+// configuration to the appropriate preferences and to check whether a policy
+// configuration is valid.
+class ConfigurationPolicyHandlerInterface {
+ public:
+  ConfigurationPolicyHandlerInterface() {}
+  virtual ~ConfigurationPolicyHandlerInterface() {}
+
+  // Returns true if the policy settings handled by this
+  // ConfigurationPolicyHandler can be applied and false otherwise. Fills
+  // |errors| with error messages or warnings. |errors| may contain error
+  // messages even when |CheckPolicySettings()| returns true.
+  virtual bool CheckPolicySettings(const PolicyMap* policies,
+                                   PolicyErrorMap* errors) = 0;
+
+  // Processes the policies handled by this ConfigurationPolicyHandler and sets
+  // the appropriate preferences in |prefs|.
+  virtual void ApplyPolicySettings(const PolicyMap* policies,
+                                   PrefValueMap* prefs) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyHandlerInterface);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_HANDLER_INTERFACE_H_