Move templates from constants to files

src/main/java/de/monticore/lang/monticar/generator/roscpp/helper/TemplateHelper.java

+package de.monticore.lang.monticar.generator.roscpp.helper;
+
+import de.se_rwth.commons.logging.Log;
+import org.apache.commons.io.IOUtils;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class TemplateHelper {
+    private static Map<String, String> cache = new HashMap<>();
+
+    private static String getTemplate(String fileName) {
+        if (cache.containsKey(fileName)) {
+            return cache.get(fileName);
+        }
+
+        String tmpStr = "";
+        String resourceFileName = "/de/monticore/lang/monticar/generator/roscpp/" + fileName;
+
+        try {
+            tmpStr = IOUtils.toString(TemplateHelper.class.getResourceAsStream(resourceFileName));
+        } catch (Exception e) {
+            //Not recoverable
+            Log.error("Template file not found: " + resourceFileName);
+        }
+
+        cache.put(fileName, tmpStr);
+        return tmpStr;
+    }
+
+    public static String getCMakeListsTemplate() {
+        return getTemplate("CMakeLists.template");
+    }
+
+    public static String getMsgGenTemplate() {
+        return getTemplate("msgGen.template");
+    }
+
+    public static String getRos2MsgGenTemplate() {
+        return getTemplate("ros2MsgGen.template");
+    }
+
+    public static String getGenerateMsgsPyTemplate() {
+        return getTemplate("generateMsgs.py.template");
+    }
+
+}

src/main/resources/de/monticore/lang/monticar/generator/roscpp/CMakeLists.template

+cmake_minimum_required(VERSION 3.5)
+project (<name>)
+set (CMAKE_CXX_STANDARD 14)
+set (AMENT_CMAKE_UNINSTALL_TARGET FALSE)
+
+<packages>
+
+add_library(<name> <name>.cpp)
+set_target_properties(<name> PROPERTIES LINKER_LANGUAGE CXX)
+target_link_libraries(<name> <compName> IAdapter_<compName> <libraries>)
+target_include_directories(<name> PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} <include_dirs>)
+<dependency>
+
+export(TARGETS <name> FILE <name>.cmake)
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src/main/resources/de/monticore/lang/monticar/generator/roscpp/generateMsgs.py.template

+import rosidl_generator_cpp
+import rosidl_typesupport_cpp
+import os
+
+cur_dir = os.path.dirname(os.path.abspath(__file__)).replace("\\","/")
+
+template = None
+with open(cur_dir + "/rclcpp_msg_gen.json", "r") as f:
+    template = f.read()
+
+if template == None:
+    print("Could not load template file!")
+    exit(1)
+
+ros_base = os.path.dirname(os.path.abspath(rosidl_generator_cpp.__file__))
+if os.name == "posix":
+    ros_base = os.path.abspath(ros_base + "/../../../..")
+else:
+    ros_base = os.path.abspath(ros_base + "/../../..")
+
+template = template.replace("<ros_base>",ros_base.replace("\\","/"))
+
+template = template.replace("<cur_dir>",cur_dir.replace("\\","/"))
+generator_arguments_file = cur_dir + "/rclcpp_msg_gen_filled.json"
+
+with open(generator_arguments_file,"w") as f:
+    f.write(template)
+
+rosidl_generator_cpp.generate_cpp(generator_arguments_file)
+# rosidl_typesupport_cpp.generate_cpp(generator_arguments_file, ["rosidl_typesupport_cpp", "rosidl_typesupport_introspection_cpp" ,"rosidl_typesupport_opensplice_cpp"])
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src/main/resources/de/monticore/lang/monticar/generator/roscpp/msgGen.template

+# Generate .h files from .msg files
+add_custom_target(gen_<name>_<struct_replaced> ALL
+COMMAND python /opt/ros/kinetic/lib/gencpp/gen_cpp.py ${CMAKE_CURRENT_SOURCE_DIR}/<struct>.msg -Istruct_msgs:${CMAKE_CURRENT_SOURCE_DIR}/struct_msgs -p struct_msgs -o ${CMAKE_CURRENT_SOURCE_DIR}/struct_msgs -e /opt/ros/kinetic/share/gencpp/)
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src/main/resources/de/monticore/lang/monticar/generator/roscpp/ros2MsgGen.template

+# Generate .h files from .msg files
+add_custom_target(gen_<name>_<struct_replaced> ALL
+COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/generateMsgs.py)
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