CODEWITHSUNDEEP
javajsonpathsnakeyaml
fxrobin
fxrobin

Reputation: 652

Using JSON-PATH with SnakeYAML

I am trying to find a way to use JSON-PATH with SnakeYaml in order to select node and to still get a way to find the line number inside the yaml source file.

For example the path $.info.email will tell me that it's line 16 (for example) of the source file, read by snakeyaml.

I am able to navigate inside the nodes given by Snakeyaml (ScalarNode, MappedNode, etc.) and Snakeyaml offers a way (Mark) to get the line number of a node.

So I need a way to be able to use a json-path expression in roder to point inside the node tree of Snakeyaml.

I thought I can use JsonProvider and a MappingProvider from json-path, but things are not very clear to me and the Javadoc is quite silent about this topic.

Any advice?

Upvotes: 0

Views: 608

Answers (2)

Salvatore NashCrash De Bonis
Salvatore NashCrash De Bonis

Reputation: 21

A possible solution could be the following:

public Object getByPath(InputStream io, String path) throws Exception {
   Yaml yaml = new Yaml();
   Map<String, Object> map = yaml.load(io);
   String json = new ObjectMapper().writeValueAsString(map);
   Object value = JsonPath.read(json, path);
   return value;
}

Basically the idea is to use SnakeYaml to read the file as a map, and ObjectMapper to transform the map into a json. Then it can be read with json-path. I hope it can be useful.

Upvotes: 0

Andrey
Andrey

Reputation: 356

It is not yet implemented in SnakeYAML.

Upvotes: 0

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