private String getFeature(int wordId, int... fields) {
String[] allFeatures = getAllFeaturesArray(wordId);
if (allFeatures == null) {
return null;
}
StringBuilder sb = new StringBuilder();
if (fields.length == 0) { // All features
for (String feature : allFeatures) {
sb.append(CSVUtil.quoteEscape(feature)).append(",");
}
} else if (fields.length == 1) { // One feature doesn't need to escape value
sb.append(allFeatures[fields[0]]).append(",");
} else {
for (int field : fields) {
sb.append(CSVUtil.quoteEscape(allFeatures[field])).append(",");
}
}
return sb.deleteCharAt(sb.length() - 1).toString();
}
