tds/src/main/java/thredds/server/opendap/NcSDString.java
public boolean read(String datasetName, Object specialO) throws IOException {
    if (localVal == null) // read first time
      setData(ncVar.read());

    setValue(localVal);
    setRead(true);
    return (false);
  }
public boolean read(String datasetName, Object specialO) throws IOException {
    if (localVal == null) // read first time
      setData(ncVar.read());

    setValue(localVal);
    setRead(true);
    return (false);
  }
Read the value (parameters are ignored).