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diff --git a/emu-radio/common-library/query.h b/emu-radio/common-library/query.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WIFI_EMULATOR_QUERY_H
+#define WIFI_EMULATOR_QUERY_H
+
+#include <string>
+#include <list>
+#include <vector>
+#include <map>
+
+#include "json.h"
+
+typedef struct QueryKeys {
+  static const std::string ACTION;
+  static const std::string OBJECT_NAME;
+  static const std::string FILTER;
+  static const std::string PARAMS;
+  static const std::string FIELD_NAMES;
+  static const std::string LAST;
+} QueryKeys;
+
+// for convenience
+typedef nlohmann::json Json;
+
+class Query {
+ public:
+  Query ();
+
+  Query (const std::string &action, const std::string &objectName, const std::list<std::vector<std::string>> &filter, const std::map<std::string, std::string> &params, const std::list<std::string> &fields, bool last);
+
+  static Query fromJsonString (const std::string &jsonString);
+
+  static void removeQuotes (std::string &string);
+
+  static std::string toJsonString (const Query &query);
+
+  static std::string
+  toJsonString (const std::string &action, const std::string &objectName, const std::list<std::vector<std::string>> &filter, const std::map<std::string, std::string> &params, const std::list<std::string> &fields, bool last);
+
+  std::string toJsonString ();
+
+  const std::string &getAction () const;
+
+  void setAction (const std::string &action);
+
+  const std::string &getObjectName () const;
+
+  void setObjectName (const std::string &objectName);
+
+  const std::list<std::vector<std::string>> &getFilter () const;
+
+  void setFilter (const std::list<std::vector<std::string>> &filter);
+
+  const std::map<std::string, std::string> &getParams () const;
+
+  void setParams (const std::map<std::string, std::string> &params);
+
+  const std::list<std::string> &getFields () const;
+
+  void setFields (const std::list<std::string> &fields);
+
+  bool isLast () const;
+
+  void setLast (int last);
+
+  bool isEmpty ();
+
+ private:
+  Json query;
+
+  std::string action;
+  std::string objectName;
+  std::list<std::vector<std::string>> filter;
+  std::map<std::string, std::string> params;
+  std::list<std::string> fields;
+  bool last;
+};
+
+#endif //WIFI_EMULATOR_QUERY_H