memcached/src/main/java/site/ycsb/db/MemcachedClient.java [270:301]:
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  protected static void fromJson(
      String value, Set<String> fields,
      Map<String, ByteIterator> result) throws IOException {
    JsonNode json = MAPPER.readTree(value);
    boolean checkFields = fields != null && !fields.isEmpty();
    for (Iterator<Map.Entry<String, JsonNode>> jsonFields = json.getFields();
         jsonFields.hasNext();
         /* increment in loop body */) {
      Map.Entry<String, JsonNode> jsonField = jsonFields.next();
      String name = jsonField.getKey();
      if (checkFields && !fields.contains(name)) {
        continue;
      }
      JsonNode jsonValue = jsonField.getValue();
      if (jsonValue != null && !jsonValue.isNull()) {
        result.put(name, new StringByteIterator(jsonValue.asText()));
      }
    }
  }

  protected static String toJson(Map<String, ByteIterator> values)
      throws IOException {
    ObjectNode node = MAPPER.createObjectNode();
    Map<String, String> stringMap = StringByteIterator.getStringMap(values);
    for (Map.Entry<String, String> pair : stringMap.entrySet()) {
      node.put(pair.getKey(), pair.getValue());
    }
    JsonFactory jsonFactory = new JsonFactory();
    Writer writer = new StringWriter();
    JsonGenerator jsonGenerator = jsonFactory.createJsonGenerator(writer);
    MAPPER.writeTree(jsonGenerator, node);
    return writer.toString();
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seaweedfs/src/main/java/site/ycsb/db/seaweed/SeaweedClient.java [286:317]:
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  protected static void fromJson(
          String value, Set<String> fields,
          Map<String, ByteIterator> result) throws IOException {
    JsonNode json = MAPPER.readTree(value);
    boolean checkFields = fields != null && !fields.isEmpty();
    for (Iterator<Map.Entry<String, JsonNode>> jsonFields = json.getFields();
         jsonFields.hasNext();
      /* increment in loop body */) {
      Map.Entry<String, JsonNode> jsonField = jsonFields.next();
      String name = jsonField.getKey();
      if (checkFields && !fields.contains(name)) {
        continue;
      }
      JsonNode jsonValue = jsonField.getValue();
      if (jsonValue != null && !jsonValue.isNull()) {
        result.put(name, new StringByteIterator(jsonValue.asText()));
      }
    }
  }

  protected static String toJson(Map<String, ByteIterator> values)
          throws IOException {
    ObjectNode node = MAPPER.createObjectNode();
    Map<String, String> stringMap = StringByteIterator.getStringMap(values);
    for (Map.Entry<String, String> pair : stringMap.entrySet()) {
      node.put(pair.getKey(), pair.getValue());
    }
    JsonFactory jsonFactory = new JsonFactory();
    Writer writer = new StringWriter();
    JsonGenerator jsonGenerator = jsonFactory.createJsonGenerator(writer);
    MAPPER.writeTree(jsonGenerator, node);
    return writer.toString();
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