Preference provider implementation backed by JSON files in a directory.

chrome/browser/config_dir_policy_provider.h

Index: chrome/browser/config_dir_policy_provider.h
diff --git a/chrome/browser/config_dir_policy_provider.h b/chrome/browser/config_dir_policy_provider.h
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+++ b/chrome/browser/config_dir_policy_provider.h
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+// Copyright (c) 2010 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_CONFIG_DIR_POLICY_PROVIDER_H_
+#define CHROME_BROWSER_CONFIG_DIR_POLICY_PROVIDER_H_
+
+#include "base/basictypes.h"
+#include "base/file_path.h"
+#include "chrome/browser/configuration_policy_provider.h"
+
+class DictionaryValue;
+
+// A policy provider implementation backed by a set of files in a given
+// directory. The files should contain JSON-formatted policy settings. They are
+// merged together and the result is returned via the
+// ConfigurationPolicyProvider interface. The files are consulted in
+// lexicographic file name order, so the last value read takes precedence in
+// case of preference key collisions.
+class ConfigDirPolicyProvider : public ConfigurationPolicyProvider {
+ public:
+  explicit ConfigDirPolicyProvider(const FilePath& config_dir);
+  virtual ~ConfigDirPolicyProvider() { }
+
+  // ConfigurationPolicyProvider implementation.
+  virtual bool Provide(ConfigurationPolicyStore* store);
+
+ private:
+  // Read and merge the files from the configuration directory.
+  DictionaryValue* ReadPolicies();
+
+  // The directory in which we look for configuration files.
+  const FilePath config_dir_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConfigDirPolicyProvider);
+};
+
+#endif  // CHROME_BROWSER_CONFIG_DIR_POLICY_PROVIDER_H_