[Jackson]why TextNode doesn't have update value(set) method?

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I want to modify the value of TextNode using jackson.

But there is no such method in API.

Then I try to use reflection to break the limitation:

public class TestModify {

public static void main(final String[] args) throws JsonProcessingException, IOException,
        NoSuchFieldException, SecurityException, IllegalArgumentException,
        IllegalAccessException {
    final String json = "[{},\"123123\",\"12456\"]";
    final ObjectMapper mapper = new ObjectMapper();
    final JsonNode node = mapper.readTree(json);
    final Iterator<JsonNode> nodes = node.elements();
    while (nodes.hasNext()) {
        final JsonNode n = nodes.next();
        if (n instanceof TextNode) {
            final Field f = TextNode.class.getDeclaredField("_value");
            f.setAccessible(true);
            f.set(n, "updated");
        }
        System.out.println(n.getClass());
    }
    System.out.println(node);
}

}

The code seems work fine and println:

class com.fasterxml.jackson.databind.node.ObjectNode
class com.fasterxml.jackson.databind.node.TextNode
class com.fasterxml.jackson.databind.node.TextNode
[{},"updated","updated"]   

so why there is not update methods in original API?

asked 9 secs ago

fairjm

76

[Jackson]why TextNode doesn't have update value(set) method?