/**
* Validates the structure of the merged csv files.
*
* @param mFiles List of MasterFiles to check
* @return Returns true if the data structure of all given files matches. Throws an user exception
* (MergeException) otherwise.
* @throws MergeException
*/
public static boolean dataStructureMatch(List<MasterFile> mFiles) throws MergeException {
String[] headers = null;
String headerLine = "";
String currFile = "";
BufferedReader reader;
FileInputStream fis;
boolean firstRun = true;
try {
int maxHeaderSize = 0;
for (MasterFile mFile : mFiles) {
String fPath = mFile.getLocalAbsolutePath();
currFile = fPath;
File csvFile = new File(fPath);
FileReader freader = new FileReader(csvFile);
CSVReader csvreader = new CSVReader(freader, '\t', CSVWriter.NO_QUOTE_CHARACTER);
headers = csvreader.readNext();
if (headers != null) {
if (headers.length != maxHeaderSize) {
maxHeaderSize = headers.length;
// get header line
fis = new FileInputStream(fPath);
reader = new BufferedReader(new InputStreamReader(fis));
headerLine = reader.readLine();
reader.close();
if (!firstRun) {
throw new MergeException(
"Data structure has changed within the given interval. File:"
+ mFile.getName()
+ "; Time tag of the file:"
+ mFile.getCreated()
+ ". The number of columns has changed.",
1);
}
firstRun = false;
}
} else {
throw new MergeException("Error reading csv file header: " + currFile, 1);
}
csvreader.close();
}
if (maxHeaderSize == 0 || headerLine.equals("")) {
throw new MergeException("Zero length header in csv file!", 1);
}
return true;
} catch (FileNotFoundException ex) {
throw new MergeException("CSV file not found. " + currFile + " " + ex.getMessage(), 1);
} catch (IOException ex) {
throw new MergeException("Error reading csv file: " + currFile + " " + ex.getMessage(), 1);
}
}
