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+// Copyright 2016 The Draco Authors.
+//
+// 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 DRACO_CORE_OPTIONS_H_
+#define DRACO_CORE_OPTIONS_H_
+
+#include <cstdlib>
+#include <map>
+#include <string>
+
+namespace draco {
+
+// Class for storing generic options as a <name, value> pair in a string map.
+// The API provides helper methods for directly storing values of various types
+// such as ints and bools. One named option should be set with only a single
+// data type.
+class Options {
+ public:
+  Options();
+
+  // Merges |other_options| on top of the existing options of this instance
+  // replacing all entries that are present in both options instances.
+  void MergeAndReplace(const Options &other_options);
+
+  void SetInt(const std::string &name, int val);
+  void SetFloat(const std::string &name, float val);
+  void SetBool(const std::string &name, bool val);
+  void SetString(const std::string &name, const std::string &val);
+  template <class VectorT>
+  void SetVector(const std::string &name, const VectorT &vec) {
+    SetVector(name, &vec[0], VectorT::dimension);
+  }
+  template <typename DataTypeT>
+  void SetVector(const std::string &name, const DataTypeT *vec, int num_dims);
+
+  // Getters will return a default value if the entry is not found. The default
+  // value can be specified in the overloaded version of each function.
+  int GetInt(const std::string &name) const;
+  int GetInt(const std::string &name, int default_val) const;
+  float GetFloat(const std::string &name) const;
+  float GetFloat(const std::string &name, float default_val) const;
+  bool GetBool(const std::string &name) const;
+  bool GetBool(const std::string &name, bool default_val) const;
+  std::string GetString(const std::string &name) const;
+  std::string GetString(const std::string &name,
+                        const std::string &default_val) const;
+  template <class VectorT>
+  VectorT GetVector(const std::string &name, const VectorT &default_val) const;
+  // Unlike other Get functions, this function returns false if the option does
+  // not exist, otherwise it fills |out_val| with the vector values. If a
+  // default value is needed, it can be set in |out_val|.
+  template <typename DataTypeT>
+  bool GetVector(const std::string &name, int num_dims,
+                 DataTypeT *out_val) const;
+
+  bool IsOptionSet(const std::string &name) const {
+    return options_.count(name) > 0;
+  }
+
+ private:
+  // All entries are internally stored as strings and converted to the desired
+  // return type based on the used Get* method.
+  // TODO(ostava): Consider adding type safety mechanism that would prevent
+  // unsafe operations such as a conversion from vector to int.
+  std::map<std::string, std::string> options_;
+};
+
+template <typename DataTypeT>
+void Options::SetVector(const std::string &name, const DataTypeT *vec,
+                        int num_dims) {
+  std::string out;
+  for (int i = 0; i < num_dims; ++i) {
+    if (i > 0) {
+      out += " ";
+    }
+
+// GNU STL on android doesn't include a proper std::to_string, but the libc++
+// version does
+#if defined(ANDROID) && !defined(_LIBCPP_VERSION)
+    out += to_string(vec[i]);
+#else
+    out += std::to_string(vec[i]);
+#endif
+  }
+  options_[name] = out;
+}
+
+template <class VectorT>
+VectorT Options::GetVector(const std::string &name,
+                           const VectorT &default_val) const {
+  VectorT ret = default_val;
+  GetVector(name, VectorT::dimension, &ret[0]);
+  return ret;
+}
+
+template <typename DataTypeT>
+bool Options::GetVector(const std::string &name, int num_dims,
+                        DataTypeT *out_val) const {
+  const auto it = options_.find(name);
+  if (it == options_.end()) {
+    return false;
+  }
+  const std::string value = it->second;
+  if (value.length() == 0) {
+    return true;  // Option set but no data is present
+  }
+  const char *act_str = value.c_str();
+  char *next_str;
+  for (int i = 0; i < num_dims; ++i) {
+    if (std::is_integral<DataTypeT>::value) {
+#ifdef ANDROID
+      const int val = strtol(act_str, &next_str, 10);
+#else
+      const int val = static_cast<int>(std::strtol(act_str, &next_str, 10));
+#endif
+      if (act_str == next_str) {
+        return true;  // End reached.
+      }
+      act_str = next_str;
+      out_val[i] = static_cast<DataTypeT>(val);
+    } else {
+#ifdef ANDROID
+      const float val = strtof(act_str, &next_str);
+#else
+      const float val = std::strtof(act_str, &next_str);
+#endif
+      if (act_str == next_str) {
+        return true;  // End reached.
+      }
+      act_str = next_str;
+      out_val[i] = static_cast<DataTypeT>(val);
+    }
+  }
+  return true;
+}
+
+}  // namespace draco
+
+#endif  // DRACO_CORE_OPTIONS_H_