Approach to load entire YAML file as a tree (Map, or a graph) in Java.

[Abhishek K]

Hi folks,

I have a YAML file of the following type: 

Name : Abhishek kona

Age : 23

Male : True

notification :

    port:1988

    host:run1

I want to load the entire yaml file and have an object on which I am able to lookup like  Obj.get("notification").get("port") and so on.

I have not found any examples of doing that. What would be the most type safe way of doing this.

-Abhishek Kona

[Andrey]

Hi,

Yaml yaml = new Yaml();

Map<String, Object> obj = (Map<String, Object>) yaml.load(input);

System.out.println(obj);

should be enough.

[Abhishek Kona]

For the given YAML file:

Name : Abhishek kona
Age : 23
Male : True
notification :
    port:1988

    host:asdf


This java code throws up an Cannot Cast error:
         Yaml yaml = new Yaml();
        URL sampleYaml = this.getClass().getResource("/Sample.yaml");
        InputStream input = new FileInputStream(new File(
                sampleYaml.getFile()));
        Map<String, Object> objectMap = (Map<String, Object>) yaml.load(input);
        System.out.println("objectMap = " + objectMap);
        Map<String, Object> subObjMap = (Map<String, Object>) objectMap.get("notification");
        System.out.println("subObjMap = " + subObjMap);


Any ideas on what I am doing wrong.
-Abhishek Kona

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[Andrey]

Use spaces around ':' to distinguish it from a scalar (a String)

You can check here your document structure:

http://instantyaml.appspot.com/

[Abhishek Kona]

Thanks works now.
-Abhishek Kona.

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