BaseDomainLabelList.java 文件源码

/**
 * Turns the list CSV data into a map of labels to parsed data of type R.
 *
 * @param lines the CSV file, line by line
 */
public ImmutableMap<String, R> parse(Iterable<String> lines) {
  Map<String, R> labelsToEntries = new HashMap<>();
  Multiset<String> duplicateLabels = HashMultiset.create();
  for (String line : lines) {
    R entry = createFromLine(line);
    if (entry == null) {
      continue;
    }
    String label = entry.getLabel();
    // Check if the label was already processed for this list (which is an error), and if so,
    // accumulate it so that a list of all duplicates can be thrown.
    if (labelsToEntries.containsKey(label)) {
      duplicateLabels.add(label, duplicateLabels.contains(label) ? 1 : 2);
    } else {
      labelsToEntries.put(label, entry);
    }
  }
  if (!duplicateLabels.isEmpty()) {
    throw new IllegalStateException(
        String.format(
            "List '%s' cannot contain duplicate labels. Dupes (with counts) were: %s",
            name, duplicateLabels));
  }
  return ImmutableMap.copyOf(labelsToEntries);
}