/// <summary>
/// a constructor.
/// </summary>
/// <param name="fieldTermStack">FieldTermStack object</param>
/// <param name="fieldQuery">FieldQuery object</param>
/// <param name="phraseLimit">maximum size of phraseList</param>
public FieldPhraseList(FieldTermStack fieldTermStack, FieldQuery fieldQuery, int phraseLimit)
{
String field = fieldTermStack.FieldName;
LinkedList <TermInfo> phraseCandidate = new LinkedList <TermInfo>();
QueryPhraseMap currMap = null;
QueryPhraseMap nextMap = null;
while (!fieldTermStack.IsEmpty() && (phraseList.Count < phraseLimit))
{
phraseCandidate.Clear();
TermInfo ti = fieldTermStack.Pop();
currMap = fieldQuery.GetFieldTermMap(field, ti.Text);
// if not found, discard top TermInfo from stack, then try next element
if (currMap == null)
{
continue;
}
// if found, search the longest phrase
phraseCandidate.AddLast(ti);
while (true)
{
ti = fieldTermStack.Pop();
nextMap = null;
if (ti != null)
{
nextMap = currMap.GetTermMap(ti.Text);
}
if (ti == null || nextMap == null)
{
if (ti != null)
{
fieldTermStack.Push(ti);
}
if (currMap.IsValidTermOrPhrase(new List <TermInfo>(phraseCandidate)))
{
AddIfNoOverlap(new WeightedPhraseInfo(phraseCandidate, currMap.Boost, currMap.TermOrPhraseNumber));
}
else
{
while (phraseCandidate.Count > 1)
{
TermInfo last = phraseCandidate.Last.Value;
phraseCandidate.RemoveLast();
fieldTermStack.Push(last);
currMap = fieldQuery.SearchPhrase(field, new List <TermInfo>(phraseCandidate));
if (currMap != null)
{
AddIfNoOverlap(new WeightedPhraseInfo(phraseCandidate, currMap.Boost, currMap.TermOrPhraseNumber));
break;
}
}
}
break;
}
else
{
phraseCandidate.AddLast(ti);
currMap = nextMap;
}
}
}
}
/// <summary>
/// create a FieldPhraseList that has no limit on the number of phrases to analyze
/// <param name="fieldQuery">FieldTermStack object</param>
/// <param name="fieldTermStack">FieldQuery object</param>
/// </summary>
public FieldPhraseList(FieldTermStack fieldTermStack, FieldQuery fieldQuery) : this(fieldTermStack, fieldQuery, Int32.MaxValue)
{
}