twist_subscriber.hpp

// Copyright (C) 2023 Ryan Friedman
//
// 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 NAV2_UTIL__TWIST_SUBSCRIBER_HPP_
#define NAV2_UTIL__TWIST_SUBSCRIBER_HPP_
 
 
#include <memory>
#include <string>
#include <utility>
 
#include "geometry_msgs/msg/twist.hpp"
#include "geometry_msgs/msg/twist_stamped.hpp"
#include "rclcpp/parameter_service.hpp"
#include "rclcpp/qos.hpp"
 
#include "nav2_ros_common/lifecycle_node.hpp"
#include "nav2_ros_common/node_utils.hpp"
 
namespace nav2_util
{
 
class TwistSubscriber
{
public:
  template<typename TwistCallbackT,
    typename TwistStampedCallbackT
  >
  explicit TwistSubscriber(
    nav2::LifecycleNode::SharedPtr node,
    const std::string & topic,
    TwistCallbackT && TwistCallback,
    TwistStampedCallbackT && TwistStampedCallback,
    const rclcpp::QoS & qos = nav2::qos::StandardTopicQoS()
  )
  {
    is_stamped_ = node->declare_or_get_parameter("enable_stamped_cmd_vel", true);
    if (is_stamped_) {
      twist_stamped_sub_ = node->create_subscription<geometry_msgs::msg::TwistStamped>(
        topic,
        std::forward<TwistStampedCallbackT>(TwistStampedCallback),
        qos);
    } else {
      twist_sub_ = node->create_subscription<geometry_msgs::msg::Twist>(
        topic,
        std::forward<TwistCallbackT>(TwistCallback),
        qos);
    }
  }
 
  template<typename TwistStampedCallbackT>
  explicit TwistSubscriber(
    nav2::LifecycleNode::SharedPtr node,
    const std::string & topic,
    TwistStampedCallbackT && TwistStampedCallback,
    const rclcpp::QoS & qos = nav2::qos::StandardTopicQoS()
  )
  {
    is_stamped_ = node->declare_or_get_parameter("enable_stamped_cmd_vel", true);
    if (is_stamped_) {
      twist_stamped_sub_ = node->create_subscription<geometry_msgs::msg::TwistStamped>(
        topic,
        std::forward<TwistStampedCallbackT>(TwistStampedCallback),
        qos);
    } else {
      throw std::invalid_argument(
              "enable_stamped_cmd_vel must be true when using this constructor!");
    }
  }
 
protected:
  bool is_stamped_{true};
  nav2::Subscription<geometry_msgs::msg::Twist>::SharedPtr twist_sub_ {nullptr};
  nav2::Subscription<geometry_msgs::msg::TwistStamped>::SharedPtr twist_stamped_sub_ {nullptr};
};
 
 
}  // namespace nav2_util
 
#endif  // NAV2_UTIL__TWIST_SUBSCRIBER_HPP_