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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * 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 EnvVar.h
+ * @ingroup COM_AI_RUNTIME
+ * @brief This file contains nnfw::misc::EnvVar class
+ */
+
+#ifndef __NNFW_MISC_ENV_VAR__
+#define __NNFW_MISC_ENV_VAR__
+
+#include <algorithm>
+#include <array>
+#include <cstdlib>
+#include <string>
+
+namespace nnfw
+{
+namespace misc
+{
+/**
+ * @brief Class to access environment variable
+ */
+class EnvVar
+{
+public:
+ /**
+ * @brief Construct a new EnvVar object
+ * @param[in] key environment variable
+ */
+ EnvVar(const std::string &key)
+ {
+ const char *value = std::getenv(key.c_str());
+ if (value == nullptr)
+ {
+ // An empty string is considered as an empty value
+ _value = "";
+ }
+ else
+ {
+ _value = value;
+ }
+ }
+
+ /**
+ * @brief Get environment variable of string type
+ * @param[in] def Default value of environment variable
+ * @return Defaut value passed as a parameter when there is no environment variable,
+ * otherwise the value of environment variable passed into constructor
+ */
+ std::string asString(const std::string &def) const
+ {
+ if (_value.empty())
+ return def;
+ return _value;
+ }
+
+ /**
+ * @brief Get environment variable of boolean type
+ * @param[in] def Default value of environment variable
+ * @return Defaut value passed as a parameter when there is no environment variable,
+ * otherwise the value of environment variable passed into constructor
+ */
+ bool asBool(bool def) const
+ {
+ if (_value.empty())
+ return def;
+ static const std::array<std::string, 5> false_list{"0", "OFF", "FALSE", "N", "NO"};
+ auto false_found = std::find(false_list.begin(), false_list.end(), _value);
+ return (false_found == false_list.end());
+ }
+
+ /**
+ * @brief Get environment variable of int type
+ * @param[in] def Default value of environment variable
+ * @return Defaut value passed as a parameter when there is no environment variable,
+ * otherwise the value of environment variable passed into constructor
+ */
+ int asInt(int def) const
+ {
+ if (_value.empty())
+ return def;
+ return std::stoi(_value);
+ }
+
+ /**
+ * @brief Get environment variable of float type
+ * @param[in] def Default value of environment variable
+ * @return Defaut value passed as a parameter when there is no environment variable,
+ * otherwise the value of environment variable passed into constructor
+ */
+ float asFloat(float def) const
+ {
+ if (_value.empty())
+ return def;
+ return std::stof(_value);
+ }
+
+private:
+ std::string _value;
+};
+
+} // namespace misc
+} // namespace nnfw
+
+#endif // __NNFW_MISC_ENV_VAR__