chromium/components/policy/core/common/policy_merger.h

// Copyright 2019 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_POLICY_MERGER_H_
#define COMPONENTS_POLICY_CORE_COMMON_POLICY_MERGER_H_

#include <stddef.h>
#include <memory>
#include <string>

#include "base/containers/flat_set.h"
#include "components/policy/core/common/policy_map.h"
#include "components/policy/policy_export.h"

namespace policy {

// Abstract class that provides an interface to apply custom merging logic on a
// set of policies.
class POLICY_EXPORT PolicyMerger { … };

// PolicyListMerger allows the merging of policy lists that have multiple
// sources. Each policy that has to be merged will have the values from its
// multiple sources concatenated without duplicates.
class POLICY_EXPORT PolicyListMerger : public PolicyMerger { … };

// PolicyDictionaryMerger allows the merging of policy dictionaries that have
// multiple sources. Each policy that has to be merged will have its first level
// keys merged into one dictionary, each conflict will be resolved by
// using the key coming from the highest priority source.
class POLICY_EXPORT PolicyDictionaryMerger : public PolicyMerger { … };

// PolicyGroupMerger enforces atomic policy groups. It disables the policies
// from a group that do not share the highest priority from that group.
class POLICY_EXPORT PolicyGroupMerger : public PolicyMerger { … };

}  // namespace policy

#endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_MERGER_H_