| using System; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Search.Spans |
| { |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| using AtomicReaderContext = Lucene.Net.Index.AtomicReaderContext; |
| using IBits = Lucene.Net.Util.IBits; |
| using IndexReader = Lucene.Net.Index.IndexReader; |
| using Term = Lucene.Net.Index.Term; |
| using TermContext = Lucene.Net.Index.TermContext; |
| |
| /// <summary> |
| /// Base class for filtering a <see cref="SpanQuery"/> based on the position of a match. |
| /// </summary> |
| public abstract class SpanPositionCheckQuery : SpanQuery |
| #if FEATURE_CLONEABLE |
| , System.ICloneable |
| #endif |
| { |
| protected SpanQuery m_match; |
| |
| protected SpanPositionCheckQuery(SpanQuery match) // LUCENENET: CA1012: Abstract types should not have constructors (marked protected) |
| { |
| this.m_match = match; |
| } |
| |
| /// <returns> |
| /// The <see cref="SpanQuery"/> whose matches are filtered. |
| /// </returns> |
| public virtual SpanQuery Match => m_match; |
| |
| public override string Field => m_match.Field; |
| |
| public override void ExtractTerms(ISet<Term> terms) |
| { |
| m_match.ExtractTerms(terms); |
| } |
| |
| /// <summary> |
| /// Return value for <see cref="SpanPositionCheckQuery.AcceptPosition(Spans)"/>. |
| /// </summary> |
| protected internal enum AcceptStatus |
| { |
| /// <summary> |
| /// Indicates the match should be accepted </summary> |
| YES, |
| |
| /// <summary> |
| /// Indicates the match should be rejected </summary> |
| NO, |
| |
| /// <summary> |
| /// Indicates the match should be rejected, and the enumeration should advance |
| /// to the next document. |
| /// </summary> |
| NO_AND_ADVANCE |
| } |
| |
| /// <summary> |
| /// Implementing classes are required to return whether the current position is a match for the passed in |
| /// "match" <see cref="Lucene.Net.Search.Spans.SpanQuery"/>. |
| /// <para/> |
| /// This is only called if the underlying <see cref="Lucene.Net.Search.Spans.Spans.MoveNext()"/> for the |
| /// match is successful |
| /// </summary> |
| /// <param name="spans"> The <see cref="Lucene.Net.Search.Spans.Spans"/> instance, positioned at the spot to check </param> |
| /// <returns> Whether the match is accepted, rejected, or rejected and should move to the next doc. |
| /// </returns> |
| /// <seealso cref="Lucene.Net.Search.Spans.Spans.MoveNext()"/> |
| protected abstract AcceptStatus AcceptPosition(Spans spans); |
| |
| public override Spans GetSpans(AtomicReaderContext context, IBits acceptDocs, IDictionary<Term, TermContext> termContexts) |
| { |
| return new PositionCheckSpan(this, context, acceptDocs, termContexts); |
| } |
| |
| public override Query Rewrite(IndexReader reader) |
| { |
| SpanPositionCheckQuery clone = null; |
| |
| var rewritten = (SpanQuery)m_match.Rewrite(reader); |
| if (rewritten != m_match) |
| { |
| clone = (SpanPositionCheckQuery)this.Clone(); |
| clone.m_match = rewritten; |
| } |
| |
| if (clone != null) |
| { |
| return clone; // some clauses rewrote |
| } |
| else |
| { |
| return this; // no clauses rewrote |
| } |
| } |
| |
| protected class PositionCheckSpan : Spans |
| { |
| private readonly SpanPositionCheckQuery outerInstance; |
| |
| private readonly Spans spans; // LUCENENET: marked readonly |
| |
| public PositionCheckSpan(SpanPositionCheckQuery outerInstance, AtomicReaderContext context, IBits acceptDocs, IDictionary<Term, TermContext> termContexts) |
| { |
| this.outerInstance = outerInstance; |
| spans = outerInstance.m_match.GetSpans(context, acceptDocs, termContexts); |
| } |
| |
| public override bool MoveNext() |
| { |
| if (!spans.MoveNext()) |
| { |
| return false; |
| } |
| |
| return DoNext(); |
| } |
| |
| public override bool SkipTo(int target) |
| { |
| if (!spans.SkipTo(target)) |
| { |
| return false; |
| } |
| |
| return DoNext(); |
| } |
| |
| protected internal virtual bool DoNext() |
| { |
| for (; ; ) |
| { |
| switch (outerInstance.AcceptPosition(this)) |
| { |
| case AcceptStatus.YES: |
| return true; |
| |
| case AcceptStatus.NO: |
| if (!spans.MoveNext()) |
| { |
| return false; |
| } |
| break; |
| |
| case AcceptStatus.NO_AND_ADVANCE: |
| if (!spans.SkipTo(spans.Doc + 1)) |
| { |
| return false; |
| } |
| break; |
| } |
| } |
| } |
| |
| public override int Doc => spans.Doc; |
| |
| public override int Start => spans.Start; |
| |
| // TODO: Remove warning after API has been finalized |
| public override int End => spans.End; |
| |
| public override ICollection<byte[]> GetPayload() |
| { |
| List<byte[]> result = null; |
| if (spans.IsPayloadAvailable) |
| { |
| result = new List<byte[]>(spans.GetPayload()); |
| } |
| return result; //TODO: any way to avoid the new construction? |
| } |
| |
| // TODO: Remove warning after API has been finalized |
| public override bool IsPayloadAvailable => spans.IsPayloadAvailable; |
| |
| public override long GetCost() |
| { |
| return spans.GetCost(); |
| } |
| |
| public override string ToString() |
| { |
| return "spans(" + outerInstance.ToString() + ")"; |
| } |
| } |
| } |
| } |