/// <summary> Constructs a new query which applies a filter to the results of the original query.
/// Filter.getDocIdSet() will be called every time this query is used in a search.
/// </summary>
/// <param name="query"> Query to be filtered, cannot be <c>null</c>.
/// </param>
/// <param name="filter">Filter to apply to query results, cannot be <c>null</c>.
/// </param>
public FilteredQuery(Query query, Filter filter)
{
this.query = query;
this.filter = filter;
}
/// <summary>Search implementation with arbitrary sorting. Finds
/// the top <c>n</c> hits for <c>query</c>, applying
/// <c>filter</c> if non-null, and sorting the hits by the criteria in
/// <c>sort</c>.
///
/// <p/>NOTE: this does not compute scores by default; use
/// <see cref="IndexSearcher.SetDefaultFieldSortScoring(bool,bool)" /> to enable scoring.
///
/// </summary>
/// <throws> BooleanQuery.TooManyClauses </throws>
public virtual TopFieldDocs Search(Query query, Filter filter, int n, Sort sort)
{
return Search(CreateWeight(query), filter, n, sort);
}
/// <summary>Lower-level search API.
///
/// <p/><see cref="Collector.Collect(int)" /> is called for every matching
/// document.
/// <br/>Collector-based access to remote indexes is discouraged.
///
/// <p/>Applications should only use this if they need <i>all</i> of the
/// matching documents. The high-level search API (<see cref="Searcher.Search(Query, Filter, int)" />)
/// is usually more efficient, as it skips
/// non-high-scoring hits.
///
/// </summary>
/// <param name="query">to match documents
/// </param>
/// <param name="filter">if non-null, used to permit documents to be collected.
/// </param>
/// <param name="results">to receive hits
/// </param>
/// <throws> BooleanQuery.TooManyClauses </throws>
public virtual void Search(Query query, Filter filter, Collector results)
{
Search(CreateWeight(query), filter, results);
}
public abstract TopDocs Search(Weight weight, Filter filter, int n);
public abstract TopFieldDocs Search(Weight weight, Filter filter, int n, Sort sort);
/// <summary> A search implementation allowing sorting which spans a new thread for each
/// Searchable, waits for each search to complete and merges
/// the results back together.
/// </summary>
public override TopFieldDocs Search(Weight weight, Filter filter, int nDocs, Sort sort)
{
if (sort == null) throw new ArgumentNullException("sort");
FieldDocSortedHitQueue hq = new FieldDocSortedHitQueue(nDocs);
object lockObj = new object();
Task<TopFieldDocs>[] tasks = new Task<TopFieldDocs>[searchables.Length];
for (int i = 0; i < searchables.Length; i++) // search each searchable
{
int cur = i;
tasks[i] =
Task<TopFieldDocs>.Factory.StartNew(
() => MultiSearcherCallableWithSort(ThreadLock.MonitorLock, lockObj, searchables[cur], weight, filter, nDocs, hq, sort, cur,
starts));
}
int totalHits = 0;
float maxScore = float.NegativeInfinity;
Task.WaitAll(tasks);
foreach (TopFieldDocs topFieldDocs in tasks.Select(x => x.Result))
{
totalHits += topFieldDocs.TotalHits;
maxScore = Math.Max(maxScore, topFieldDocs.MaxScore);
}
ScoreDoc[] scoreDocs = new ScoreDoc[hq.Size()];
for (int i = hq.Size() - 1; i >= 0; i--)
scoreDocs[i] = hq.Pop();
return new TopFieldDocs(totalHits, scoreDocs, hq.GetFields(), maxScore);
}
public override TopFieldDocs Search(Weight weight, Filter filter, int n, Sort sort)
{
throw new System.NotSupportedException();
}
public override void Search(Weight weight, Filter filter, Collector collector)
{
if (filter == null)
{
for (int i = 0; i < subReaders.Length; i++)
{
// search each subreader
collector.SetNextReader(subReaders[i], docStarts[i]);
Scorer scorer = weight.Scorer(subReaders[i], !collector.AcceptsDocsOutOfOrder, true);
if (scorer != null)
{
scorer.Score(collector);
}
}
}
else
{
for (int i = 0; i < subReaders.Length; i++)
{
// search each subreader
collector.SetNextReader(subReaders[i], docStarts[i]);
SearchWithFilter(subReaders[i], weight, filter, collector);
}
}
}
private void SearchWithFilter(IndexReader reader, Weight weight, Filter filter, Collector collector)
{
System.Diagnostics.Debug.Assert(filter != null);
Scorer scorer = weight.Scorer(reader, true, false);
if (scorer == null)
{
return ;
}
int docID = scorer.DocID();
System.Diagnostics.Debug.Assert(docID == - 1 || docID == DocIdSetIterator.NO_MORE_DOCS);
// CHECKME: use ConjunctionScorer here?
DocIdSet filterDocIdSet = filter.GetDocIdSet(reader);
if (filterDocIdSet == null)
{
// this means the filter does not accept any documents.
return ;
}
DocIdSetIterator filterIter = filterDocIdSet.Iterator();
if (filterIter == null)
{
// this means the filter does not accept any documents.
return ;
}
int filterDoc = filterIter.NextDoc();
int scorerDoc = scorer.Advance(filterDoc);
collector.SetScorer(scorer);
while (true)
{
if (scorerDoc == filterDoc)
{
// Check if scorer has exhausted, only before collecting.
if (scorerDoc == DocIdSetIterator.NO_MORE_DOCS)
{
break;
}
collector.Collect(scorerDoc);
filterDoc = filterIter.NextDoc();
scorerDoc = scorer.Advance(filterDoc);
}
else if (scorerDoc > filterDoc)
{
filterDoc = filterIter.Advance(scorerDoc);
}
else
{
scorerDoc = scorer.Advance(filterDoc);
}
}
}
public override TopFieldDocs Search(Weight weight, Filter filter, int nDocs, Sort sort)
{
return Search(weight, filter, nDocs, sort, true);
}
/// <summary> Just like <see cref="Search(Weight, Filter, int, Sort)" />, but you choose
/// whether or not the fields in the returned <see cref="FieldDoc" /> instances
/// should be set by specifying fillFields.
/// <p/>
/// NOTE: this does not compute scores by default. If you need scores, create
/// a <see cref="TopFieldCollector" /> instance by calling
/// <see cref="TopFieldCollector.Create" /> and then pass that to
/// <see cref="Search(Weight, Filter, Collector)" />.
/// <p/>
/// </summary>
public virtual TopFieldDocs Search(Weight weight, Filter filter, int nDocs, Sort sort, bool fillFields)
{
nDocs = Math.Min(nDocs, reader.MaxDoc);
TopFieldCollector collector2 = TopFieldCollector.Create(sort, nDocs, fillFields, fieldSortDoTrackScores, fieldSortDoMaxScore, !weight.GetScoresDocsOutOfOrder());
Search(weight, filter, collector2);
return (TopFieldDocs) collector2.TopDocs();
}
// inherit javadoc
public override TopDocs Search(Weight weight, Filter filter, int nDocs)
{
if (nDocs <= 0)
{
throw new System.ArgumentException("nDocs must be > 0");
}
nDocs = Math.Min(nDocs, reader.MaxDoc);
TopScoreDocCollector collector = TopScoreDocCollector.Create(nDocs, !weight.GetScoresDocsOutOfOrder());
Search(weight, filter, collector);
return collector.TopDocs();
}
public override TopFieldDocs Search(Weight weight, Filter filter, int n, Sort sort)
{
var hq = new FieldDocSortedHitQueue(n);
int totalHits = 0;
float maxScore = System.Single.NegativeInfinity;
var lockObj = new object();
for (int i = 0; i < searchables.Length; i++)
{
// search each searcher
// use NullLock, we don't care about synchronization for these
TopFieldDocs docs = MultiSearcherCallableWithSort(ThreadLock.NullLock, lockObj, searchables[i], weight, filter, n, hq, sort,
i, starts);
totalHits += docs.TotalHits;
maxScore = System.Math.Max(maxScore, docs.MaxScore);
}
ScoreDoc[] scoreDocs2 = new ScoreDoc[hq.Size()];
for (int i = hq.Size() - 1; i >= 0; i--)
// put docs in array
scoreDocs2[i] = hq.Pop();
return new TopFieldDocs(totalHits, scoreDocs2, hq.GetFields(), maxScore);
}
public override TopDocs Search(Weight weight, Filter filter, int nDocs)
{
HitQueue hq = new HitQueue(nDocs, false);
int totalHits = 0;
var lockObj = new object();
for (int i = 0; i < searchables.Length; i++)
{
// search each searcher
// use NullLock, we don't care about synchronization for these
TopDocs docs = MultiSearcherCallableNoSort(ThreadLock.NullLock, lockObj, searchables[i], weight, filter, nDocs, hq, i, starts);
totalHits += docs.TotalHits; // update totalHits
}
ScoreDoc[] scoreDocs2 = new ScoreDoc[hq.Size()];
for (int i = hq.Size() - 1; i >= 0; i--)
// put docs in array
scoreDocs2[i] = hq.Pop();
float maxScore = (totalHits == 0)?System.Single.NegativeInfinity:scoreDocs2[0].Score;
return new TopDocs(totalHits, scoreDocs2, maxScore);
}
public ConstantScoreQuery(Filter filter)
{
this.internalFilter = filter;
}
/// <summary>Finds the top <c>n</c>
/// hits for <c>query</c>, applying <c>filter</c> if non-null.
///
/// </summary>
/// <throws> BooleanQuery.TooManyClauses </throws>
public virtual TopDocs Search(Query query, Filter filter, int n)
{
return Search(CreateWeight(query), filter, n);
}
/// <summary> A search implementation which executes each
/// <see cref="Searchable"/> in its own thread and waits for each search to complete
/// and merge the results back together.
/// </summary>
public override TopDocs Search(Weight weight, Filter filter, int nDocs)
{
HitQueue hq = new HitQueue(nDocs, false);
object lockObj = new object();
Task<TopDocs>[] tasks = new Task<TopDocs>[searchables.Length];
//search each searchable
for (int i = 0; i < searchables.Length; i++)
{
int cur = i;
tasks[i] =
Task.Factory.StartNew(() => MultiSearcherCallableNoSort(ThreadLock.MonitorLock, lockObj, searchables[cur], weight, filter,
nDocs, hq, cur, starts));
}
int totalHits = 0;
float maxScore = float.NegativeInfinity;
Task.WaitAll(tasks);
foreach(TopDocs topDocs in tasks.Select(x => x.Result))
{
totalHits += topDocs.TotalHits;
maxScore = Math.Max(maxScore, topDocs.MaxScore);
}
ScoreDoc[] scoreDocs = new ScoreDoc[hq.Size()];
for (int i = hq.Size() - 1; i >= 0; i--) // put docs in array
scoreDocs[i] = hq.Pop();
return new TopDocs(totalHits, scoreDocs, maxScore);
}
public abstract void Search(Weight weight, Filter filter, Collector results);
/// <summary>Lower-level search API.
///
/// <p/><see cref="Collector.Collect(int)" /> is called for every matching document.
///
/// <p/>Applications should only use this if they need <i>all</i> of the
/// matching documents. The high-level search API (<see cref="Searcher.Search(Query, int)" />)
/// is usually more efficient, as it skips
/// non-high-scoring hits.
/// <p/>This method cannot be parallelized, because <see cref="Collector"/>
/// supports no concurrent access.
/// </summary>
/// <param name="weight">to match documents
/// </param>
/// <param name="filter">if non-null, a bitset used to eliminate some documents
/// </param>
/// <param name="collector">to receive hits
///
/// TODO: parallelize this one too
/// </param>
public override void Search(Weight weight, Filter filter, Collector collector)
{
for (int i = 0; i < searchables.Length; i++)
{
int start = starts[i];
Collector hc = new AnonymousClassCollector1(collector, start, this);
searchables[i].Search(weight, filter, hc);
}
}
public override void Search(Weight weight, Filter filter, Collector results)
{
throw new System.NotSupportedException();
}
