how to loop over nested yaml file content?

[Mohammed Suleman khan]

I am having a .yml file that has nested level navigation items that I am going to use for building the navigation. here my .yml file content.

navigationItems:
-
link: /features
label: Features
-
link: /contact
label: Contact Us
-
link: /about
label: About Us
-
link: /services
label: Services
navigationItems:
-
link: /service-1
label: Service 1

I am having two mapper classes navigation and navigatiomItems to map the fields of this yml file, Navigation.groovy

class Navigation {

List<NavigationItem> navigationItems
}

NavigationItem.groovy

class NavigationItem {

String link
String label
List<NavigationItem> navigationItems
}

I am using Jackson objectmapper to map the fields of yml with my mapper class like this:

private Navigation mapYamlNavigation(final String mdFileContents) {
final ObjectMapper mapper = new ObjectMapper(new YAMLFactory()); // jackson databind
Navigation navigations = new Navigation();
// matches true means that we have legit yaml in our .md file
try {
// read and assign the yaml to our properties
navigations = mapper.readValue(mdFileContents, Navigation.class);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return navigations;
}

here I am trying to loop over it to get the all label, links and also the nested ones

private String yamlToHtml() throws FileNotFoundException {
String filePath = "src/main/resources/static/navigation/topnav.yml";
String content = new Scanner(new FileReader(filePath)).useDelimiter("\\Z").next();
Navigation navItems = mapYamlNavigation(content);
for (NavigationItem nav : navItems.getNavigationItems()) {
System.out.println(nav.getLabel());
System.out.println(nav.getLink());
System.out.println(navItems.getNavigationItems().size());
if (navItems.getNavigationItems().size() > 0) {
for (int i=0; i<navItems.getNavigationItems().size(); i++) {
System.out.println(navItems.getNavigationItems().get(i).getLabel());
System.out.println(navItems.getNavigationItems().get(i).getLink());
}
}
}

return null;
}

I am able to get the top ones but I am not able to get the nested ones that is

navigationItems:
-
link: /service-1
label: Service 1

can anyone tell me how can I loop to get the nested ones ? is my yaml file is in correct order ?

[Daniel Pitts]

On 1/23/16 6:27 AM, Stefan Ram wrote:

> Mohammed Suleman khan <salmank...@gmail.com> writes:
>> I am having a .yml file that has nested level navigation
>

> public final class Main
> {
>
> private static final java.lang.String source =
> "navigationItems:\n" +
> "-\n" +
> " link: /features\n" +
> " label: Features\n" +
> "-\n" +
> " link: /contact\n" +
> " label: Contact Us\n" +
> "-\n" +
> " link: /about\n" +
> " label: About Us\n" +
> "-\n" +
> " link: /services\n" +
> " label: Services\n" +
> " navigationItems:\n" +
> " -\n" +
> " link: /service-1\n" +
> " label: Service 1\n";
>
> public static void main(String args[]) throws Exception
> { final java.util.regex.Pattern p =
> java.util.regex.Pattern.compile
> ( "^ {6}([^ ].*)$", java.util.regex.Pattern.MULTILINE );
> final java.util.regex.Matcher m = p.matcher( source );
> while( m.find() )java.lang.System.out.println( m.group( 1 )); }}

>
> link: /service-1
> label: Service 1
>

Stefan: why are you using regex to parse Yaml? Yaml has a spec, and its
far more complex than your regex suggests.

Mohammed: The problem is that you're trying to represent a tree
structure as a list. Really you need:

class NavigationNode {
private List<NavigationNode> children;
private String label;
private String link;
}


Then you can use recursion to go through the list.

Hopefully this helps.

[Jeff Higgins]

He has:

class NavigationItem {

String link String label List<NavigationItem> navigationItems
}

and also;

I am using Jackson objectmapper to map the fields of yml with my mapper
class like this:

and;

here I am trying to loop over it to get the all label, links and also the
nested ones

private String yamlToHtml() throws FileNotFoundException {
String filePath =
"src/main/resources/static/navigation/topnav.yml";

and;

Navigation.groovy (?) in a couple places.

all apparently to build some html;

I am having a .yml file that has nested level navigation items that I am
going to use for building the navigation. here my .yml file content.

so that I'm not certain whether this cluelessness, trolling, or some
highly developed workflow.