| using J2N.Collections.Generic.Extensions; |
| using J2N.Numerics; |
| using System; |
| using System.Collections.Generic; |
| using System.Text; |
| using JCG = J2N.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; |
| using ToStringUtils = Lucene.Net.Util.ToStringUtils; |
| |
| /// <summary> |
| /// Matches the union of its clauses. </summary> |
| public class SpanOrQuery : SpanQuery |
| #if FEATURE_CLONEABLE |
| , System.ICloneable |
| #endif |
| { |
| private readonly IList<SpanQuery> clauses; |
| private string field; |
| |
| /// <summary> |
| /// Construct a <see cref="SpanOrQuery"/> merging the provided <paramref name="clauses"/>. </summary> |
| public SpanOrQuery(params SpanQuery[] clauses) : this((IList<SpanQuery>)clauses) { } |
| |
| // LUCENENET specific overload. |
| // LUCENENET TODO: API - This constructor was added to eliminate casting with PayloadSpanUtil. Make public? |
| // It would be more useful if the type was an IEnumerable<SpanQuery>, but |
| // need to rework the allocation below. It would also be better to change AddClause() to Add() to make |
| // the C# collection initializer function. |
| internal SpanOrQuery(IList<SpanQuery> clauses) |
| { |
| // copy clauses array into an ArrayList |
| this.clauses = new JCG.List<SpanQuery>(clauses.Count); |
| for (int i = 0; i < clauses.Count; i++) |
| { |
| AddClause(clauses[i]); |
| } |
| } |
| |
| /// <summary> |
| /// Adds a <paramref name="clause"/> to this query </summary> |
| public void AddClause(SpanQuery clause) |
| { |
| if (field == null) |
| { |
| field = clause.Field; |
| } |
| else if (clause.Field != null && !clause.Field.Equals(field, StringComparison.Ordinal)) |
| { |
| throw new ArgumentException("Clauses must have same field."); |
| } |
| this.clauses.Add(clause); |
| } |
| |
| /// <summary> |
| /// Return the clauses whose spans are matched. </summary> |
| public virtual SpanQuery[] GetClauses() |
| { |
| return clauses.ToArray(); |
| } |
| |
| public override string Field => field; |
| |
| public override void ExtractTerms(ISet<Term> terms) |
| { |
| foreach (SpanQuery clause in clauses) |
| { |
| clause.ExtractTerms(terms); |
| } |
| } |
| |
| public override object Clone() |
| { |
| int sz = clauses.Count; |
| SpanQuery[] newClauses = new SpanQuery[sz]; |
| |
| for (int i = 0; i < sz; i++) |
| { |
| newClauses[i] = (SpanQuery)clauses[i].Clone(); |
| } |
| SpanOrQuery soq = new SpanOrQuery(newClauses); |
| soq.Boost = Boost; |
| return soq; |
| } |
| |
| public override Query Rewrite(IndexReader reader) |
| { |
| SpanOrQuery clone = null; |
| for (int i = 0; i < clauses.Count; i++) |
| { |
| SpanQuery c = clauses[i]; |
| SpanQuery query = (SpanQuery)c.Rewrite(reader); |
| if (query != c) // clause rewrote: must clone |
| { |
| if (clone == null) |
| { |
| clone = (SpanOrQuery)this.Clone(); |
| } |
| clone.clauses[i] = query; |
| } |
| } |
| if (clone != null) |
| { |
| return clone; // some clauses rewrote |
| } |
| else |
| { |
| return this; // no clauses rewrote |
| } |
| } |
| |
| public override string ToString(string field) |
| { |
| StringBuilder buffer = new StringBuilder(); |
| buffer.Append("spanOr(["); |
| bool first = true; |
| foreach (SpanQuery clause in clauses) |
| { |
| if (!first) buffer.Append(", "); |
| buffer.Append(clause.ToString(field)); |
| first = false; |
| } |
| buffer.Append("])"); |
| buffer.Append(ToStringUtils.Boost(Boost)); |
| return buffer.ToString(); |
| } |
| |
| public override bool Equals(object o) |
| { |
| if (this == o) |
| { |
| return true; |
| } |
| if (o == null || this.GetType() != o.GetType()) |
| { |
| return false; |
| } |
| |
| SpanOrQuery that = (SpanOrQuery)o; |
| |
| if (!clauses.Equals(that.clauses)) |
| { |
| return false; |
| } |
| |
| return Boost == that.Boost; |
| } |
| |
| public override int GetHashCode() |
| { |
| //If this doesn't work, hash all elemnts together instead. This version was used to reduce time complexity |
| int h = clauses.GetHashCode(); |
| h ^= (h << 10) | (h.TripleShift(23)); |
| h ^= J2N.BitConversion.SingleToRawInt32Bits(Boost); |
| return h; |
| } |
| |
| private class SpanQueue : Util.PriorityQueue<Spans> |
| { |
| public SpanQueue(int size) |
| : base(size) |
| { |
| } |
| |
| protected internal override bool LessThan(Spans spans1, Spans spans2) |
| { |
| if (spans1.Doc == spans2.Doc) |
| { |
| if (spans1.Start == spans2.Start) |
| { |
| return spans1.End < spans2.End; |
| } |
| else |
| { |
| return spans1.Start < spans2.Start; |
| } |
| } |
| else |
| { |
| return spans1.Doc < spans2.Doc; |
| } |
| } |
| } |
| |
| public override Spans GetSpans(AtomicReaderContext context, IBits acceptDocs, IDictionary<Term, TermContext> termContexts) |
| { |
| if (clauses.Count == 1) // optimize 1-clause case |
| { |
| return (clauses[0]).GetSpans(context, acceptDocs, termContexts); |
| } |
| |
| return new SpansAnonymousClass(this, context, acceptDocs, termContexts); |
| } |
| |
| private class SpansAnonymousClass : Spans |
| { |
| private readonly SpanOrQuery outerInstance; |
| |
| private readonly AtomicReaderContext context; |
| private readonly IBits acceptDocs; |
| private readonly IDictionary<Term, TermContext> termContexts; |
| |
| public SpansAnonymousClass(SpanOrQuery outerInstance, AtomicReaderContext context, IBits acceptDocs, IDictionary<Term, TermContext> termContexts) |
| { |
| this.outerInstance = outerInstance; |
| this.context = context; |
| this.acceptDocs = acceptDocs; |
| this.termContexts = termContexts; |
| queue = null; |
| } |
| |
| private SpanQueue queue; |
| private long cost; |
| |
| private bool InitSpanQueue(int target) |
| { |
| queue = new SpanQueue(outerInstance.clauses.Count); |
| foreach (var clause in outerInstance.clauses) |
| { |
| Spans spans = clause.GetSpans(context, acceptDocs, termContexts); |
| cost += spans.GetCost(); |
| if (((target == -1) && spans.MoveNext()) || ((target != -1) && spans.SkipTo(target))) |
| { |
| queue.Add(spans); |
| } |
| } |
| return queue.Count != 0; |
| } |
| |
| public override bool MoveNext() |
| { |
| if (queue == null) |
| { |
| return InitSpanQueue(-1); |
| } |
| |
| if (queue.Count == 0) // all done |
| { |
| return false; |
| } |
| |
| if (Top.MoveNext()) // move to next |
| { |
| queue.UpdateTop(); |
| return true; |
| } |
| |
| queue.Pop(); // exhausted a clause |
| return queue.Count != 0; |
| } |
| |
| private Spans Top => queue.Top; |
| |
| public override bool SkipTo(int target) |
| { |
| if (queue == null) |
| { |
| return InitSpanQueue(target); |
| } |
| |
| bool skipCalled = false; |
| while (queue.Count != 0 && Top.Doc < target) |
| { |
| if (Top.SkipTo(target)) |
| { |
| queue.UpdateTop(); |
| } |
| else |
| { |
| queue.Pop(); |
| } |
| skipCalled = true; |
| } |
| |
| if (skipCalled) |
| { |
| return queue.Count != 0; |
| } |
| return MoveNext(); |
| } |
| |
| public override int Doc => Top.Doc; |
| |
| public override int Start => Top.Start; |
| |
| public override int End => Top.End; |
| |
| public override ICollection<byte[]> GetPayload() |
| { |
| List<byte[]> result = null; |
| Spans theTop = Top; |
| if (theTop != null && theTop.IsPayloadAvailable) |
| { |
| result = new List<byte[]>(theTop.GetPayload()); |
| } |
| return result; |
| } |
| |
| public override bool IsPayloadAvailable |
| { |
| get |
| { |
| Spans top = Top; |
| return top != null && top.IsPayloadAvailable; |
| } |
| } |
| |
| public override string ToString() |
| { |
| return "spans(" + outerInstance + ")@" + ((queue == null) ? "START" : (queue.Count > 0 ? (Doc + ":" + Start + "-" + End) : "END")); |
| } |
| |
| public override long GetCost() |
| { |
| return cost; |
| } |
| } |
| } |
| } |