/// <summary>
/// Gets Postings of a given term from in-memory index.
/// </summary>
/// <param name="term">a processed string</param>
/// <return>a posting list</return>
public IList <Posting> GetPostings(string term)
{
List <Posting> result = postingMap.Get(term);
Console.WriteLine("results for get postings" + result.Count);
if (default(List <Posting>) == result)
{
return(new List <Posting>());
}
else
{
return(result);
}
}
public void TestWriteToDisk()
{
OnDiskDictionary <string, string> dic = new OnDiskDictionary <string, string>("./", "TestAlphabet", new StringEncoderDecoder(), new StringEncoderDecoder());
dic.Add("A", "Apple");
dic.Add("B", "Banana");
dic.Add("C", "Cat");
dic.Add("D", "Dog");
dic.Add("E", "Eye");
Assert.Equal("Apple", dic.Get("A"));
Assert.Equal("Eye", dic.Get("E"));
Assert.Equal("Banana", dic.Get("B"));
Assert.Equal("Dog", dic.Get("D"));
Assert.Equal("Cat", dic.Get("C"));
dic.Clear();
}
/// <summary>
/// Get a list of vocabularies for a given kGram
/// </summary>
/// <param name="kGram">K-gram to search for</param>
/// <returns>A list of vocabularies</returns>
public List <string> getVocabularies(string kGram)
{
//If requested k-gram's length is less than this k-gram size, use mini kgram to find the right k-gram
if (kGram.Length < this.size)
{
HashSet <string> candidates = new HashSet <string>();
List <string> possibleKGram = this.miniMap.Get(kGram);
if (possibleKGram == default(List <string>))
{
return(new List <string>());
}
List <List <string> > KGramLists = new List <List <string> >();
foreach (string k in possibleKGram)
{
List <string> result = map.Get(k);
if (result != default(List <string>))
{
foreach (string item in result)
{
candidates.Add(item);
}
}
}
return(candidates.ToList());
}
else
{
List <string> result = this.map.Get(kGram);
return(default(List <string>) == result ? new List <string>() : result);
}
}
// not sure what GetDocWeightsIds is used for ? but apparently nothing references it so we might not even need it ???
// public List<int> GetDocWeightsIds()
// {
// List<int> documents = docWeigthsHashMap.GetKeys().ToList();
// List<PostingDocWeight> finalList = new List<PostingDocWeight>();
// foreach (int documentID in documents)
// {
// finalList.Add(GetPostingDocWeight(documentID));
// }
// return finalList;
// }
public PostingDocWeight GetPostingDocWeight(int docID)
{
PostingDocWeight result = docWeigthsHashMap.Get(docID);
if (default(PostingDocWeight) == result)
{
return(new PostingDocWeight(0.0, 0, 0, 0.0));
}
else
{
return(result);
}
}
public List <MaxPriorityQueue.InvertedIndex> GetPostingsFromTier(string term, int tierNumber = 1)
{
List <MaxPriorityQueue.InvertedIndex> result = new List <MaxPriorityQueue.InvertedIndex>();
List <MaxPriorityQueue.InvertedIndex> temp = new List <MaxPriorityQueue.InvertedIndex>();
switch (tierNumber)
{
case 1:
temp = tier1.Get(term);
result.AddRange(temp);
if (result.Count < 20)
{
goto case 2;
}
else
{
return(result);
}
case 2:
temp = tier2.Get(term);
result.AddRange(temp);
if (result.Count < 20)
{
goto case 3;
}
else
{
return(result);
}
case 3:
temp = tier3.Get(term);
result.AddRange(temp);
return(result);
default:
//an empty posting if the term does not exist.
return(result);
}
}
