nresare/nryaml

experimenting with wrapper objects for yaml traversal

nryaml

This small library aims to make it easier to work with data returned from a yaml parser such as snakeyaml. The design is influence from the antonsjava/json parsing library and the types it returns.

The basic idea is that in Java, navigating a structure built by arbitrary primitive types, maps and lists is verbose and error-prone. One needs to cast the data to be able to traverse it, and little library offers a convenient way chaining method calls instead.

License

This code is licensed under the Apache License version 2.0, please see LICENSE for additional details.

nryaml's Issues

NullPointerException when parsing values set to null

Hello,

A NullPointerException is thrown whenever a null value is present in a YAML file, more specifically: Exception in thread "main" java.lang.NullPointerException: Cannot invoke "Object.getClass()" because "input" is null.

The following is a simple case to reproduce the error:

apiVersion: dummyApi
kind: CustomResourceDefinition
metadata:
  name: null

If I then use the function allFromPath to parse the above YAML file, the error is thrown.

The proposed solution has to do with the method handling the parsing itself, more specifically:

    public static Iterable<YAMLValue> allFromPath(Path path) {
        try (var inputStream = Files.newInputStream(path)) {
            return stream(parser.get().loadAll(inputStream))
                    .map(YAMLValueImpl::new)
                    .collect(Collectors.toList());
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

I suppose the error arises from the line YAMLValueImpl:new.