/// <summary>
/// Takes records from a specified input file, sorts them as being either valid or invalid, and writes
/// them to corresponding output files. To be valid, a given record must have the same number of fields
/// as was specified by the user.
///
/// If a record is valid, it is written to "<see cref="OutputFileNames.VALID" />". If it is invalid, it
/// is written to "<see cref="OutputFileNames.INVALID" />". This will overwrite any previous contents
/// in either file, if it already exists, or create a new file if necessary.
///
/// If either category does not include any records, its corresponding file will not be created. In
/// that case, if such a file previously exists, it will be deleted.
/// </summary>
/// <param name="pOptions">
/// The user-specified options to use while performing this operation.
/// </param>
public void SortRecords(RecordSortingOptions pOptions)
{
InputRecordList input = _inputFileIoManager.ReadFile(pOptions);
// Per the requirements, the header row's contents are irrelevant in determining a record's validity.
string baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
ProduceOutput(Path.Combine(baseDirectory, OutputFileNames.VALID), pOptions.Delimiter, input.Records.Where(x => x.Count == pOptions.NumFields));
ProduceOutput(Path.Combine(baseDirectory, OutputFileNames.INVALID), pOptions.Delimiter, input.Records.Where(x => x.Count != pOptions.NumFields));
}
/// <summary>
/// Reads the contents of an input file and returns them in an instance of <see cref="InputRecordList"
/// />.
/// </summary>
/// <param name="pOptions">
/// The user-specified options to be used when reading the file.
/// </param>
/// <returns>
/// An instance of <see cref="InputRecordList" /> representing the contents of the input file.
/// </returns>
/// <exception cref="InvalidFileFormatException">
/// Thrown when the file's internal contents are determined to be in an invalid format.
/// </exception>
public InputRecordList ReadFile(RecordSortingOptions pOptions)
{
File.ReadAllLines(pOptions.Location);
using (StreamReader sr = new StreamReader(pOptions.Location))
{
string line = sr.ReadLine();
// The requirements specify that the file must begin with a header row.
if (line == null)
{
throw new InvalidFileFormatException();
}
string[] headerRow = line.Split(pOptions.Delimiter);
var records = new List <IReadOnlyCollection <string> >();
while ((line = sr.ReadLine()) != null)
{
records.Add(line.Split(pOptions.Delimiter));
}
return(new InputRecordList(headerRow, records));
}
}
