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JSON-LD Module for Jackson

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package ioinformarics.oss.jackson.module.jsonld.util;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

import java.util.Iterator;

/**
 * @author Alexander De Leon ([email protected])
 */
public abstract class JsonUtils {

    public static JsonNode merge(JsonNode mainNode, JsonNode updateNode) {

        Iterator fieldNames = updateNode.fieldNames();
        while (fieldNames.hasNext()) {

            String fieldName = fieldNames.next();
            JsonNode jsonNode = mainNode.get(fieldName);
            // if field exists and is an embedded object
            if (jsonNode != null && jsonNode.isObject()) {
                merge(jsonNode, updateNode.get(fieldName));
            }
            else {
                if (mainNode instanceof ObjectNode) {
                    // Overwrite field
                    JsonNode value = updateNode.get(fieldName);
                    ((ObjectNode) mainNode).set(fieldName, value);
                }
            }

        }

        return mainNode;
    }
}