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+// Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef ISC_ADAPTOR_H
+#define ISC_ADAPTOR_H 1
+
+#include <cc/data.h>
+#include <exceptions/exceptions.h>
+
+namespace isc {
+namespace yang {
+
+/// @brief JSON adaptor between canonical Kea and YANG models.
+///
+/// An adaptor slightly modifies a JSON configuration between canonical Kea
+/// what required or rendered by a YANG model, e.g. moving a parameter
+/// to/from a parent.
+/// The basic adaptor provides a set of tools.
+class Adaptor {
+public:
+ /// @brief Destructor.
+ virtual ~Adaptor() = default;
+
+ /// @brief Get user context.
+ ///
+ /// Get user-context and/or comment and return it with the comment
+ /// if exists moved inside the user-context (without checking if
+ /// there is already a comment as it should never be the case).
+ ///
+ /// This behavior is used to handle comments. For historical purposes
+ /// Kea allows to define comments in some scopes. Once the user-context
+ /// has been introduced, the comment (as a separate text field)
+ /// disappeared and was moved to comment key within user-context.
+ /// Nevertheless, the old syntax is still supported.
+ static isc::data::ConstElementPtr
+ getContext(isc::data::ConstElementPtr parent);
+
+ /// @brief Moves a parameter from parent to a list of children.
+ ///
+ /// Move a parameter from the parent to each item in a list.
+ /// If the parameter exists in a child, it is skipped for this
+ /// particular child, not overridden.
+ ///
+ /// @param name The parameter name.
+ /// @param parent The parent element.
+ /// @param list The children list.
+ static void fromParent(const std::string& name,
+ isc::data::ConstElementPtr parent,
+ isc::data::ConstElementPtr list);
+
+ /// @brief Moves a parameter to a parent.
+ ///
+ /// Move a parameter from children to the parent. All children
+ /// on the list must have the parameter specified and it has to have
+ /// the same value.
+ ///
+ /// @param name The parameter name.
+ /// @param parent The parent element.
+ /// @param list The children list.
+ static void toParent(const std::string& name,
+ isc::data::ElementPtr parent,
+ isc::data::ConstElementPtr list);
+
+ /// @brief Modify a configuration in its JSON element format.
+ ///
+ /// Smart merging tool, e.g. completing an ElementPtr received from YANG.
+ ///
+ /// A modification is a path and actions:
+ /// - path item can be:
+ /// * a string: current scope is a map, go down following the string
+ /// as a key.
+ /// * a number: current scope is a list, go down the number as an index.
+ /// * special value -1: current scope is a list, apply to all items.
+ /// * map { "<key>": <value> }: current scope is a list, go down to
+ /// the item using the key / value pair.
+ /// - an action can be: insert, replace or delete:
+ /// * insert adds a value at a key:
+ /// . in a map the key is the new entry key
+ /// . in a list an integer key is the new element index
+ /// . in a list a map key is the key / value pair the to-be-modified
+ /// element contains
+ /// * replace adds or replaces if it already exists a value at
+ /// an entry key in a map.
+ /// * delete removes a value designed by a key
+ ///
+ /// For instance to add a control-socket entry in a configuration
+ /// from a generic (vs Kea) model:
+ /// @code
+ /// path := [ ]
+ /// actions := [ {
+ /// "action": "insert",
+ /// "key": "Dhcp4",
+ /// "value":
+ /// {
+ /// "control-socket":
+ /// {
+ /// "socket-type": "unix",
+ /// "socket-name": "/tmp/kea4-ctrl-socket"
+ /// }
+ /// }
+ /// }
+ /// @endcode
+ ///
+ /// @param path The search list to follow down to the place to
+ /// apply the action list.
+ /// @param actions The action list
+ /// @param config The configuration (JSON map) to modify.
+ /// @note modify does not throw but returns on unexpected conditions.
+ static void modify(isc::data::ConstElementPtr path,
+ isc::data::ConstElementPtr actions,
+ isc::data::ElementPtr config);
+
+}; // Adaptor
+
+} // namespace yang
+} // namespace isc
+
+#endif // ISC_ADAPTOR_H