/**
* This method parses a CSV input stream and populates the database (and spreadsheet) with data.
* The caller is responsible for managing the stream.
*
* @param inStream The stream to deserialized when populating the database.
* @return populated database on sucess, null otherwise.
*/
public Datastore openAsCSV(final InputStream inStream) {
try {
LOGGER.event("open csv database from stream");
Datastore db = DatastoreFactory.newDatastore();
db.setTitleNotifier(OpenSHAPA.getApplication());
InputStreamReader isr = new InputStreamReader(inStream);
BufferedReader csvFile = new BufferedReader(isr);
// Read each line of the CSV file.
String line = csvFile.readLine();
// If we have a version identifier parse the file using the schema
// that matches that identifier.
if ("#4".equalsIgnoreCase(line)) {
// Version 4 includes a comment for columns.
line = parseDefinitions(csvFile, db);
while (line != null) {
line = parseVariable(csvFile, line, db, "#4");
}
} else if ("#3".equalsIgnoreCase(line)) {
// Version 3 includes column visible status after the column type
// Parse predicate definitions first.
line = parseDefinitions(csvFile, db);
while (line != null) {
line = parseVariable(csvFile, line, db, "#3");
}
} else if ("#2".equalsIgnoreCase(line)) {
// Parse predicate definitions first.
line = parseDefinitions(csvFile, db);
while (line != null) {
line = parseVariable(csvFile, line, db);
}
} else {
// Use the original schema to load the file - just variables,
// and no escape characters.
while (line != null) {
line = parseVariable(csvFile, line, db);
}
}
csvFile.close();
isr.close();
return db;
} catch (IOException e) {
LOGGER.error("Unable to read line from CSV file", e);
} catch (UserWarningException e) {
LOGGER.error("Unable to create new variable.", e);
}
// Error encountered - return null.
return null;
}
