/*
* Check if src and dest have overlapped part and if it is, create PhraseQueries and add expandQueries.
*
* ex1) src="a b", dest="c d" => no overlap
* ex2) src="a b", dest="a b c" => no overlap
* ex3) src="a b", dest="b c" => overlap; expandQueries={"a b c"}
* ex4) src="a b c", dest="b c d" => overlap; expandQueries={"a b c d"}
* ex5) src="a b c", dest="b c" => no overlap
* ex6) src="a b c", dest="b" => no overlap
* ex7) src="a a a a", dest="a a a" => overlap;
* expandQueries={"a a a a a","a a a a a a"}
* ex8) src="a b c d", dest="b c" => no overlap
*/
private void CheckOverlap(Dictionary<Query,Query> expandQueries, Term[] src, Term[] dest, int slop, float boost)
{
// beginning from 1 (not 0) is safe because that the PhraseQuery has multiple terms
// is guaranteed in flatten() method (if PhraseQuery has only one term, flatten()
// converts PhraseQuery to TermQuery)
for (int i = 1; i < src.Length; i++)
{
bool overlap = true;
for (int j = i; j < src.Length; j++)
{
if ((j - i) < dest.Length && !src[j].Text().Equals(dest[j - i].Text()))
{
overlap = false;
break;
}
}
if (overlap && src.Length - i < dest.Length)
{
PhraseQuery pq = new PhraseQuery();
foreach (Term srcTerm in src)
pq.Add(srcTerm);
for (int k = src.Length - i; k < dest.Length; k++)
{
pq.Add(new Term(src[0].Field(), dest[k].Text()));
}
pq.SetSlop(slop);
pq.SetBoost(boost);
if (!expandQueries.ContainsKey(pq))
expandQueries.Add(pq,pq);
}
}
}
/// <summary>
/// Adds a standard type clause to this instance
/// </summary>
/// <param name="term">Term to add to this query.</param>
/// <param name="occurrence">Defines how the term is added to this query.</param>
/// <param name="slop">The amount of allowed slop in a phrase query.</param>
/// <remarks>
/// Slop is the amount of movement each word is allowed in a non-exact phrase query.
/// For instance if you search for "Adobe Systems Incorporated" and the slop is set to 0 then
/// only results with that term is allowed. If you set the slop to 2 then two movements can be
/// made, max, for each word. In the same example with slop set to 2 results would be returned
/// for "Adobe Systems Incorporated", "Adobe Incorporated Systems", "Systems Adobe Incorporated",
/// and "Systems Incorporated Adobe".
/// </remarks>
public void AddBooleanClause(SearchTerm term, ClauseOccurrence occurrence, int slop)
{
if (term == null)
{
throw new ArgumentNullException("term", "term cannot be null");
}
IncrementTotalClauses(1);
if (term.IsPhrase)
{
PhraseQuery phraseQuery = new PhraseQuery();
phraseQuery.Add(term.GetLuceneTerm());
phraseQuery.SetSlop(slop);
phraseQuery.SetBoost(term.Boost);
this.luceneQuery.Add(phraseQuery, TypeConverter.ConvertToLuceneClauseOccurrence(occurrence));
phraseQuery = null;
}
else
{
TermQuery termQuery = new TermQuery(term.GetLuceneTerm());
termQuery.SetBoost(term.Boost);
this.luceneQuery.Add(termQuery, TypeConverter.ConvertToLuceneClauseOccurrence(occurrence));
termQuery = null;
}
}
protected Query Pq(float boost, int slop, String field, params String[] texts)
{
PhraseQuery query = new PhraseQuery();
foreach (String text in texts)
{
query.Add(new Term(field, text));
}
query.SetBoost(boost);
query.SetSlop(slop);
return(query);
}
/// <summary>
/// Adds a standard type clause to this instance
/// </summary>
/// <param name="term">Term to add to this query.</param>
/// <param name="occurrence">Defines how the term is added to this query.</param>
/// <param name="slop">The amount of allowed slop in a phrase query.</param>
/// <remarks>
/// Slop is the amount of movement each word is allowed in a non-exact phrase query.
/// For instance if you search for "Adobe Systems Incorporated" and the slop is set to 0 then
/// only results with that term is allowed. If you set the slop to 2 then two movements can be
/// made, max, for each word. In the same example with slop set to 2 results would be returned
/// for "Adobe Systems Incorporated", "Adobe Incorporated Systems", "Systems Adobe Incorporated",
/// and "Systems Incorporated Adobe".
/// </remarks>
public void AddBooleanClause(SearchTerm term, ClauseOccurrence occurrence, int slop)
{
if (term == null)
throw new ArgumentNullException("term", "term cannot be null");
IncrementTotalClauses(1);
if (term.IsPhrase) {
PhraseQuery phraseQuery = new PhraseQuery();
phraseQuery.Add(term.GetLuceneTerm());
phraseQuery.SetSlop(slop);
phraseQuery.SetBoost(term.Boost);
this.luceneQuery.Add(phraseQuery, TypeConverter.ConvertToLuceneClauseOccurrence(occurrence));
phraseQuery = null;
}
else {
TermQuery termQuery = new TermQuery(term.GetLuceneTerm());
termQuery.SetBoost(term.Boost);
this.luceneQuery.Add(termQuery, TypeConverter.ConvertToLuceneClauseOccurrence(occurrence));
termQuery = null;
}
}