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diff --git a/src/core/expression/RBAOperatorMaker.cpp b/src/core/expression/RBAOperatorMaker.cpp
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+++ b/src/core/expression/RBAOperatorMaker.cpp
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+/**
+ * Copyright (c) 2019 DENSO CORPORATION.
+ * 
+ * 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.
+ */
+
+/// @file  RBAOperatorMaker.cpp
+/// @brief Operator object generator abstract class
+
+#include "RBAOperatorMaker.hpp"
+#include "RBAOperator.hpp"
+#include "RBAJsonElement.hpp"
+#include "RBAModelElement.hpp"
+#include "RBAModelImpl.hpp"
+#include "RBAModelFactory.hpp"
+
+namespace rba
+{
+
+RBAOperatorMaker::RBAOperatorMaker(const std::string& label)
+  : RBAExpressionMaker{label}
+{
+}
+
+RBAModelElement*
+RBAOperatorMaker::setProperty(RBAModelElement* element,
+                              const RBAJsonElement* jsonElem,
+                              RBAModelImpl* model,
+                              RBAModelElement* owner)
+{
+  // Create expression
+  RBAOperator* const exprOpr {dynamic_cast<RBAOperator*>(element)};
+
+  // Set LetStatement
+  const auto pop_num = setLetStatement(model, exprOpr, jsonElem);
+
+  // Set operand
+  for(auto& param : jsonElem->findChildren("operand")->getChildren()) {
+    const auto expr = getFactory()->createElement(param->getClassName(), param.get());
+    exprOpr->addOperand(dynamic_cast<RBAExpression*>(expr));
+  }
+
+  // Pop variable
+  for(std::int32_t i{0}; i<pop_num; i++) {
+    getFactory()->popVariable();
+  }
+
+  return exprOpr;
+}
+
+}