/// <see cref="IChunkFileMerger.MergeChunkFilesIntoSingleFile(List{string}, int, string, string, string, int, bool, Action{int, int})"
public List <string> MergeChunkFilesIntoSingleFile(List <string> chunkFiles, int mergeCount, string intermediateFileTemplate,
string outputFile, string outputDirectory, int startingGeneration, bool deleteIntermediateFiles,
Action <int, int> updateProgress)
{
int currentGeneration = startingGeneration;
//Call the updateProgress callback every time an integer is merged
Action <int> updateMergeProgress = (integerCount =>
{
updateProgress?.Invoke(currentGeneration, integerCount);
});
//Create the output directory if it does not already exist
fileIO.CreateDirectory(outputDirectory);
List <string> intermediateFiles = new List <string>();
List <string> remainingFiles = chunkFiles;
//Merge the integer files until only one file is left
do
{
//Create the file template for the current generation
string generationFileTemplate = string.Format(intermediateFileTemplate, currentGeneration, "{0}");
List <string> mergedFiles = remainingFiles;
//Merge the files for the current generation
remainingFiles = integerFileMerger.MergeIntegerFiles(remainingFiles, mergeCount, generationFileTemplate,
outputDirectory, updateMergeProgress);
intermediateFiles.AddRange(remainingFiles);
//If we are to delete the intermediate files, then delete the files that were merged as part of
//this merge generation
if (deleteIntermediateFiles)
{
mergedFiles.ForEach(file => fileIO.DeleteFile(file));
}
currentGeneration++;
}while (remainingFiles.Count > 1);
string outputFilePath = Path.Combine(outputDirectory, outputFile);
//Delete any previous output file with the same name
fileIO.DeleteFile(outputFilePath);
//Rename the remaining file to the output file
//Note that an empty input file will not result in a remaining file, so we have to check to see
//if there are any remaining files
if (remainingFiles.Count > 0)
{
fileIO.RenameFile(remainingFiles[0], outputFile);
}
return(intermediateFiles);
}
