Jackson YAML: support for anchors and links

Question

I am studying the use of YAML for a somewhat complex metadata language. This would help make documents more compact and less complex if we could use YAML anchors and links . I wrote some test codes that seem to show that the Jackson YAML implementation does not support this function (and / or does not support SnakeYAML support for this function).

Here is my test YAML file:

set_one:
  bass: tama rockstar 22x16
  snare: &ludwig ludwig supralight 6.5x15
  tom1: tama rockstar 12x11
  tom2: tama rockstar 16x16

set_two:
  snare: *ludwig

I parse this file as follows:

    ObjectMapper mapper = new ObjectMapper(new YAMLFactory());
    FileInputStream fis = null;

    try
    {
        fis = new FileInputStream(file);
        JsonNode nodeTree = mapper.readTree(fis);
        examineObject(nodeTree, 0);
    }
    ...

Here is from my surveyObject () method (you can probably guess what it does):

key = "set_one", type = OBJECT
  key = "bass", type = STRING, value = "tama rockstar 22x16"
  key = "snare", type = STRING, value = "ludwig supralight 6.5x15"
  key = "tom1", type = STRING, value = "tama rockstar 12x11"
  key = "tom2", type = STRING, value = "tama rockstar 16x16"
key = "set_two", type = OBJECT
  key = "snare", type = STRING, value = "ludwig"

, - , "set_one.snare", JsonNode . , "set_two.snare" - "ludwig". ('*') , , , .

Jackson 2.8.3 SnakeYaml 1.17. , , Jackson JSON.

, . , "set_two.snare" "ludwig supralight 6.5x15".

, , , , node . , , "set_two.snare" "ludwig", node "& ludwig" node.

, , , , com.fasterxml.jackson.dataformat.yaml.YAMLParser.Feature. , ( ), .

Answer 1

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, , , , Jackson : , jackson-dataformat-yaml "" ( ), YAML ( JSON ), . , Object Id/References JSON ( id), YAML.

, : YAMLParser.Feature.USE_NATIVE_OBJECT_ID, , YAML - , , "JSON-like" plain .

, . jackson-users .