Add RosMsg generator impl

src/main/java/de/monticore/lang/monticar/generator/middleware/impls/RosMsgGenImpl.java

+package de.monticore.lang.monticar.generator.middleware.impls;
+
+import de.monticore.lang.embeddedmontiarc.embeddedmontiarc._symboltable.instanceStructure.EMAComponentInstanceSymbol;
+import de.monticore.lang.embeddedmontiarc.embeddedmontiarc._symboltable.instanceStructure.EMAPortInstanceSymbol;
+import de.monticore.lang.monticar.generator.rosmsg.GeneratorRosMsg;
+import de.monticore.lang.monticar.struct._symboltable.StructSymbol;
+import de.monticore.lang.tagging._symboltable.TaggingResolver;
+import de.monticore.symboltable.references.SymbolReference;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import java.util.stream.Stream;
+
+public class RosMsgGenImpl implements GeneratorImpl {
+
+    private String generationTargetPath;
+    private boolean ros2mode = false;
+
+    public RosMsgGenImpl(boolean ros2mode) {
+        this.ros2mode = ros2mode;
+    }
+
+    @Override
+    public List<File> generate(EMAComponentInstanceSymbol componentInstanceSymbol, TaggingResolver taggingResolver) throws IOException {
+        GeneratorRosMsg generatorRosMsg = new GeneratorRosMsg();
+        generatorRosMsg.setTarget(generationTargetPath, "struct_msgs");
+        generatorRosMsg.setRos2mode(ros2mode);
+        return generatorRosMsg.generateProject(componentInstanceSymbol);
+    }
+
+    @Override
+    public void setGenerationTargetPath(String path) {
+        this.generationTargetPath = path;
+    }
+
+    @Override
+    public boolean willAccept(EMAComponentInstanceSymbol componentInstanceSymbol) {
+        Stream<EMAPortInstanceSymbol> p = componentInstanceSymbol.getPortInstanceList().stream();
+        Stream<EMAPortInstanceSymbol> subp = componentInstanceSymbol.getSubComponents().stream().flatMap(sc -> sc.getPortInstanceList().stream());
+        Stream<EMAPortInstanceSymbol> relevantPorts = Stream.concat(p, subp);
+
+        return relevantPorts
+                .map(EMAPortInstanceSymbol::getTypeReference)
+                .filter(SymbolReference::existsReferencedSymbol)
+                .anyMatch(mcTypeReference -> mcTypeReference.getReferencedSymbol() instanceof StructSymbol);
+    }
+}