private void Swap(FileInfoClass curFic, FileInfoClass preFic)
{
int tempIndex = curFic.FileIndex;
double tempValue = curFic.DFITFValue;
curFic.FileIndex = preFic.FileIndex;
curFic.DFITFValue = preFic.DFITFValue;
preFic.FileIndex = tempIndex;
preFic.DFITFValue = tempValue;
}
private List<FileInfoClass> RetriveSubDocs(List<string> ANDTerms)
{
List<FileInfoClass> subDocs = new List<FileInfoClass>();
List<List<InvertedTableItem>> allItemLists = new List<List<InvertedTableItem>>();
//foreach (string term in ANDTerms)
for (int index = 0; index < ANDTerms.Count; ++index )
{
string term = ANDTerms[index];
int tokenId = GetTokenId(term);
if (tokenId != -1)
{
List<InvertedTableItem> itemList = this.invertedTable[tokenId];
allItemLists.Add(itemList);
}
}
List<InvertedTableItem> subItemLists = allItemLists[0];
//计算交集
for (int index = 1; index < allItemLists.Count; ++index)
{
List<InvertedTableItem> tempList = new List<InvertedTableItem>();
foreach (InvertedTableItem item in allItemLists[index])
{
foreach (InvertedTableItem item2 in subItemLists)
{
if (item2.FileIndex == item.FileIndex)
{
tempList.Add(item);
break;
}
}
}
subItemLists.Clear();
foreach (InvertedTableItem item in tempList)
{
subItemLists.Add(item);
}
}
foreach (InvertedTableItem item in subItemLists)
{
//计算df-itf
double df = item.OccurCounts;
double itf = Math.Log10(((double)this.docCounts / (double)subItemLists.Count()));
FileInfoClass fic = new FileInfoClass(item.FileIndex, df * itf);
bool flag = false;
foreach (FileInfoClass doc in subDocs)
{
if (doc.FileIndex == fic.FileIndex)
{
flag = true;
doc.DFITFValue += fic.DFITFValue;
}
}
if (false == flag)
{
subDocs.Add(fic);
}
}
return subDocs;
}
private void RemoveFileFromRelativedDocs(FileInfoClass fic)
{
foreach (FileInfoClass doc in this.relativedDocs)
{
if (doc.FileIndex == fic.FileIndex)
{
this.relativedDocs.Remove(doc);
break;
}
}
}
private void GetRelativeDoc()
{
foreach (string term in this.queryTerms)
{
int tokenId = GetTokenId(term);
if (tokenId != -1)
{
List<InvertedTableItem> itemList = this.invertedTable[tokenId];
foreach (InvertedTableItem item in itemList)
{
//计算df-itf
double df = item.OccurCounts;
double itf = Math.Log10(((double)this.docCounts / (double)itemList.Count()));
FileInfoClass fic = new FileInfoClass(item.FileIndex, df*itf);
AddIntoRelativedDocs(fic);
}
}
}
}
private Boolean CheckIsContainedInRankedDocs(FileInfoClass newFic)
{
foreach (FileInfoClass item in this.rankedDocsIndex)
{
if (item.FileIndex == newFic.FileIndex)
{
return true;
}
}
return false;
}
private void AddIntoRelativedDocs(FileInfoClass fic)
{
bool flag = false;
foreach (FileInfoClass doc in this.relativedDocs)
{
if (doc.FileIndex == fic.FileIndex)
{
flag = true;
doc.DFITFValue += fic.DFITFValue;
}
}
if (false == flag)
{
this.relativedDocs.Add(fic);
}
}