streaming json reader

[xamde]

see https://github.com/json-path/JsonPath/blob/master/json-path/src/test/java/com/jayway/jsonpath/JacksonJsonNodeJsonProviderTest.java

[xamde]

• [x] Read mapping file via Jackson ObjectMapper (as POJO)

• [x] Stream JSON data file, read one JSON object at a time (no POJO mapping possible); For each object:

  • [ ] Run JsonPath expression from Mapping.json using the jayway library on each Jackson.JsonNode -- we might have to convert to a JSON string first
  • [ ] Create a node in Gio
  • [ ] For each link in the mapping:
    • [ ] Create a link in Gio (refer=existing)
    • [ ] Create a node and link in Gio (refer=inline)

• [ ] Replace JsonPath by JsonPointer Sample: https://cassiomolin.com/2016/07/13/using-jackson-and-json-pointer-to-query-and-parse-an-arbitrary-json-node/ Spec: https://datatracker.ietf.org/doc/html/rfc6901#section-3

Jackson has native support for it!

Syntax: "aaa/bbb/3/ccc"

We can remove the mini-engine. We need to update the example json mapping file.