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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: how to loop over nested yaml file content?
Date: Sat, 23 Jan 2016 16:28:12 -0000 (UTC)
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On Sat, 23 Jan 2016 07:52:23 -0800, Daniel Pitts wrote:

> On 1/23/16 6:27 AM, Stefan Ram wrote:
>> Mohammed Suleman khan <salmankhan0921@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;
> }

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.

> 
> 
> Then you can use recursion to go through the list.
> 
> Hopefully this helps.