/// Helper function for CreateIndex
/// This function implements threading to improve indexing speed.
/// For each filename the method:
/// 1. Read the file and store in a string.
/// 2. Turn the text into IRDocument object and add to collection
/// 3. Add the IRDocument to the index
private IRCollection ReadAndProcessFiles(List <string> fileNames)
{
IRCollection collection = new IRCollection();
// Lists are not thread safe so...
// 1. need to create a ConcurrentBag<IRDocument>
// 2. add docs to this collection
// 3. then after all docs are added, convert the array to a list
int numDocs = fileNames.Count;
IRDocument[] docArray = new IRDocument[numDocs];
var conDocs = new ConcurrentBag <IRDocument>();
Parallel.ForEach(fileNames, fn =>
{
string docText = FileHandling.ReadTextFile(fn);
IRDocument doc = GetNewDoc(docText);
if (doc != null)
{
conDocs.Add(doc);
doc.AddToIndex(writer);
}
else
{
Console.WriteLine("Error with file: " + fn);
}
});
// add documents to collection object and set maxResults
collection.AddDocs(conDocs.ToList());
maxResults = conDocs.Count;
return(collection);
}
/// Builds the index...
public int CreateIndex(string collectionPath, string indexPath)
{
// start timer...
DateTime start = DateTime.Now;
// get all of the files names in the collection path
List <string> filenames = FileHandling.GetFileNames(collectionPath, false);
// initialise the index
InitIndex(indexPath);
// build the index
// this method call does lots of things in parallel
myCollection = ReadAndProcessFiles(filenames);
// close the index
CleanUpIndex();
// end timer and calculate total time
DateTime end = DateTime.Now;
TimeSpan duration = end - start;
indexTime = duration.Seconds + (float)duration.Milliseconds / 1000;
return(myCollection.Length());
}
// Parses a standard information needs file
public static Dictionary <string, string> GetInfoNeeds(string fileName)
{
Dictionary <string, string> iNeeds = new Dictionary <string, string>();
// open file and dump into a string
string document = FileHandling.ReadTextFile(fileName);
// split string based on ".I" and ".D" delimiters
string[] delims = { ".I", ".D" };
string[] docParts = document.Split(delims, StringSplitOptions.RemoveEmptyEntries);
if (docParts.Length > 2)
{
// build dicationary from string array
for (int i = 0; i < docParts.Length; i++)
{
iNeeds.Add(docParts[i].Trim(), docParts[i + 1].Trim());
// inc i so that it goes up 2 each iteration
i++;
}
return(iNeeds);
}
else
{
return(null);
}
}
/// Writes a trec evaluation file from the search results.
/// if the query is not a standard one, '000' is used as the topicID
public int WriteEvalFile(string fileName, string topicID)
{
List <string> evalList = new List <string>();
bool appendFlag = true;
// check if the file exists
if (File.Exists(fileName) == true)
{
// prompt for append
DialogResult append = MessageBox.Show("Do you want to append to the existing file?",
"Confirm",
MessageBoxButtons.YesNo);
if (append == DialogResult.Yes)
{
appendFlag = true;
}
else
{
// if overwrite confirm
DialogResult ruSure = MessageBox.Show("Are you sure you want to overwrite the file?",
"Confirm",
MessageBoxButtons.YesNo);
if (ruSure == DialogResult.Yes)
{
appendFlag = false;
}
}
}
// this is fixed
string groupName = "09648500_NathanOnly";
// structure TopicID QO DocID rank score group
string tempString = "";
for (int i = 0; i < resultsCollection.Length(); i++)
{
IRDocument doc = resultsCollection.GetIRDocument(i);
tempString = topicID + "\tQ0\t";
tempString += doc.GetDocID() + "\t";
tempString += doc.Rank + "\t";
tempString += doc.Score + "\t";
tempString += groupName + "\n";
evalList.Add(tempString);
}
// write file
FileHandling.WriteTextFile(evalList, fileName, appendFlag);
return(0);
}
// this is for testing only
public void AutoResults(string filename, Dictionary <string, string> queries, bool preproc)
{
string dontcare = "";
bool appendFlag = false;
foreach (KeyValuePair <string, string> q in queries)
{
// execute query
string topicID = q.Key;
RunQuery(q.Value, preproc, out dontcare);
// get results
//IRCollection results = BuildResults();
int numResults = BuildResults();
// write to file
string groupName = "09648500_NathanOnly";
List <string> evalList = new List <string>();
// structure TopicID QO DocID rank score group
string tempString = "";
for (int i = 0; i < numResults; i++)
{
IRDocument doc = resultsCollection.GetIRDocument(i);
tempString = topicID + "\tQ0\t";
tempString += doc.GetDocID() + "\t";
tempString += doc.Rank + "\t";
tempString += doc.Score + "\t";
tempString += groupName + "\n";
evalList.Add(tempString);
}
// write file
FileHandling.WriteTextFile(evalList, filename, appendFlag);
appendFlag = true;
}
string trecpath = "../../../../results/";
if (File.Exists(trecpath + Path.GetFileName(filename)))
{
File.Delete(trecpath + Path.GetFileName(filename));
}
File.Move(filename, trecpath + Path.GetFileName(filename));
// from MSDN
Process p = new Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = trecpath + "trec_eval";
p.StartInfo.Arguments = "-q " + trecpath + "cranqrel.txt " + trecpath + "autoquery_results.txt";
p.Start();
string output = p.StandardOutput.ReadToEnd();
p.WaitForExit();
Console.WriteLine(output);
}