We doesn't modify member once getted, we can use const return

and const method.

Change-Id: I0f7465af74b1c9a546af45a0d1eea33c93537e0c
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

2 files changed, 26 insertions, 9 deletions

diff --git a/src/diagnostic/diagnostic-message.cpp b/src/diagnostic/diagnostic-message.cpp
index bd76de0..62e97b8 100644
--- a/src/diagnostic/diagnostic-message.cpp
+++ b/src/diagnostic/diagnostic-message.cpp
@@ -43,16 +43,21 @@ uint32_t obd2_signal_t::get_pid()
 	return (uint32_t)pid_;
 }
 
-std::string& obd2_signal_t::get_generic_name()
+const std::string& obd2_signal_t::get_generic_name() const
 {
 	return generic_name_;
 }
 
-std::string obd2_signal_t::get_name()
+const std::string obd2_signal_t::get_name() const
 {
 	return prefix_ + "." + generic_name_;
 }
 
+const std::string& obd2_signal_t::get_prefix() const
+{
+	return prefix_;
+}
+
 void obd2_signal_t::set_prefix(std::string val)
 {
 	prefix_ = val;
@@ -102,11 +107,21 @@ bool obd2_signal_t::is_obd2_response(can_message_t can_message)
 	return false;
 } 	
 
-void obd2_signal_t::add_request(int pid)
+/**
+ * @brief Build a DiagnosticRequest struct to be passed
+ *  to diagnostic manager instance.
+ */
+const DiagnosticRequest obd2_signal_t::build_diagnostic_request()
 {
-	DiagnosticRequest request = {
-	arbitration_id: OBD2_FUNCTIONAL_BROADCAST_ID,
-	mode: 0x1, has_pid: true, pid: pid_ };
+	return {/*arbitration_id: */OBD2_FUNCTIONAL_BROADCAST_ID,
+			/*mode: */0x1,
+			/*has_pid: */true,
+			/*pid: */pid_,
+			/*pid_length: */0,
+			/*payload[]: */{0},
+			/*payload_length: */0,
+			/*no_frame_padding: */false,
+			/*DiagnosticRequestType: */DiagnosticRequestType::DIAGNOSTIC_REQUEST_TYPE_PID };
 }
 
 /**
diff --git a/src/diagnostic/diagnostic-message.hpp b/src/diagnostic/diagnostic-message.hpp
index 534b9a5..8301917 100644
--- a/src/diagnostic/diagnostic-message.hpp
+++ b/src/diagnostic/diagnostic-message.hpp
@@ -59,11 +59,13 @@ class obd2_signal_t {
 		obd2_signal_t(uint8_t pid, const char* generic_name, const int min_, const int max_, enum UNIT unit, int frequency, bool supported);
 
 		uint32_t get_pid();
-		std::string& get_generic_name();
-		std::string get_name();
+		const std::string& get_generic_name() const;
+		const std::string get_name() const;
+		const std::string& get_prefix() const;
 
 		void set_prefix(std::string val);
-		void add_request(int pid);
+
+		const DiagnosticRequest build_diagnostic_request();
 
 		bool is_obd2_response(can_message_t can_message);
 		bool is_obd2_request(DiagnosticRequest *request);