private List<String> getPatientIds(DataMatrix dataMatrix) {
List<LinkedList<String>> patientIds = dataMatrix.getColumnData(PATIENT_ID);
if (patientIds.isEmpty()) {
patientIds = dataMatrix.getColumnData(FOLLOW_UP_PATIENT_ID);
}
return (patientIds.isEmpty())
? Collections.<String>emptyList()
: convertFollowupPatientIds(patientIds.get(0));
}
private String getValue(int index, String columnName, DataMatrix dataMatrix) {
List<LinkedList<String>> columnData = dataMatrix.getColumnData(columnName);
String value = MissingAttributeValues.getNotAvailable();
if (!columnData.isEmpty()) {
value = columnData.get(0).get(index);
}
return (value.isEmpty()) ? MissingAttributeValues.getNotAvailable() : value;
}