public synchronized EnrichmentResultWriter open() {
LOG.info("Opening result writer on file: " + outFile.getAbsolutePath());
if (outFile.exists()) {
throw new RuntimeException("File already exists, stopping: " + outFile.getAbsolutePath());
}
checkIfWritable(outFile);
final FileWriter fileWriter;
try {
fileWriter = new FileWriter(outFile, true);
} catch (IOException e) {
throw new RuntimeException(e);
}
try {
this.printer =
new CSVPrinter(
fileWriter,
CSVFormat.EXCEL
.withDelimiter(';')
.withHeader("idRef", "isbn", "userEmail", "resultStatus", "errorMessage"));
} catch (IOException e) {
throw new RuntimeException("Unable to write results to CSV: " + outFile.getAbsolutePath(), e);
}
return this;
}
/**
* Returns a <code>CSVParser</code> object to access the contents of an open file, possibly
* without a header row and a different data delimiter than a comma.
*
* <p>Each line of the file should be formatted as data separated by the delimiter passed as a
* parameter and with/without a header row to describe the column names. This is useful if the
* data is separated by some character other than a comma.
*
* @param withHeader uses first row of data as a header row only if true
* @param delimiter a single character that separates one field of data from another
* @return a <code>CSVParser</code> that can provide access to the records in the file one at a
* time
* @throws exception if this file does not represent a CSV formatted data
* @throws exception if <code>delimiter.length() != 1</code>
*/
public CSVParser getCSVParser(boolean withHeader, String delimiter) {
if (delimiter == null || delimiter.length() != 1) {
throw new ResourceException(
"FileResource: CSV delimiter must be a single character: " + delimiter);
}
try {
char delim = delimiter.charAt(0);
Reader input = new StringReader(mySource);
if (withHeader) {
return new CSVParser(input, CSVFormat.EXCEL.withHeader().withDelimiter(delim));
} else {
return new CSVParser(input, CSVFormat.EXCEL.withDelimiter(delim));
}
} catch (Exception e) {
throw new ResourceException("FileResource: cannot read " + myPath + " as a CSV file.");
}
}