class GenericListVisitorAdapterGenerator extends VisitorGenerator {
    public GenericListVisitorAdapterGenerator(SourceRoot sourceRoot) {
        super(sourceRoot, "com.github.javaparser.ast.visitor", "GenericListVisitorAdapter", "List<R>", "A", true);
    }

    @Override
    protected void generateVisitMethodBody(BaseNodeMetaModel node, MethodDeclaration visitMethod, CompilationUnit compilationUnit) {<FILL_FUNCTION_BODY>}
}

        visitMethod.getParameters().forEach(p -> p.setFinal(true));

        BlockStmt body = visitMethod.getBody().get();
        body.getStatements().clear();
        body.addStatement("List<R> result = new ArrayList<>();");
        body.addStatement("List<R> tmp;");

        final String resultCheck = "if (tmp != null) result.addAll(tmp);";

        for (PropertyMetaModel field : node.getAllPropertyMetaModels()) {
            final String getter = field.getGetterMethodName() + "()";
            if (field.getNodeReference().isPresent()) {
                if (field.isOptional()) {
                    body.addStatement(f("if (n.%s.isPresent()) {" +
                            "   tmp = n.%s.get().accept(this, arg);" +
                            "   %s" +
                            "}", getter, getter, resultCheck));
                } else {
                    body.addStatement(f("{ tmp = n.%s.accept(this, arg); %s }", getter, resultCheck));
                }
            }
        }
        body.addStatement("return result;");
        Arrays.stream(new Class<?>[] {List.class, ArrayList.class}).filter(c ->
                compilationUnit.getImports().stream().noneMatch(
                        i -> c.getName().equals(i.getName().asString())
                )
        ).forEach(compilationUnit::addImport);
    
<methods>public final void generate() throws java.lang.Exception<variables>private final non-sealed java.lang.String argumentType,private final non-sealed boolean createMissingVisitMethods,private final non-sealed java.lang.String pkg,private final non-sealed java.lang.String returnType,private final non-sealed java.lang.String visitorClassName