| using Lucene.Net.Index; |
| using System; |
| using System.Collections.Generic; |
| using System.Text; |
| |
| 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 DocsAndPositionsEnum = Lucene.Net.Index.DocsAndPositionsEnum; |
| using Fields = Lucene.Net.Index.Fields; |
| using Term = Lucene.Net.Index.Term; |
| using TermContext = Lucene.Net.Index.TermContext; |
| using Terms = Lucene.Net.Index.Terms; |
| using TermsEnum = Lucene.Net.Index.TermsEnum; |
| using TermState = Lucene.Net.Index.TermState; |
| using ToStringUtils = Lucene.Net.Util.ToStringUtils; |
| |
| /// <summary> |
| /// Matches spans containing a term. </summary> |
| public class SpanTermQuery : SpanQuery |
| { |
| protected Term m_term; |
| |
| /// <summary> |
| /// Construct a <see cref="SpanTermQuery"/> matching the named term's spans. </summary> |
| public SpanTermQuery(Term term) |
| { |
| this.m_term = term; |
| } |
| |
| /// <summary> |
| /// Return the term whose spans are matched. </summary> |
| public virtual Term Term => m_term; |
| |
| public override string Field => m_term.Field; |
| |
| public override void ExtractTerms(ISet<Term> terms) |
| { |
| terms.Add(m_term); |
| } |
| |
| public override string ToString(string field) |
| { |
| StringBuilder buffer = new StringBuilder(); |
| if (m_term.Field.Equals(field, StringComparison.Ordinal)) |
| { |
| buffer.Append(m_term.Text()); |
| } |
| else |
| { |
| buffer.Append(m_term.ToString()); |
| } |
| buffer.Append(ToStringUtils.Boost(Boost)); |
| return buffer.ToString(); |
| } |
| |
| public override int GetHashCode() |
| { |
| const int prime = 31; |
| int result = base.GetHashCode(); |
| result = prime * result + ((m_term == null) ? 0 : m_term.GetHashCode()); |
| return result; |
| } |
| |
| public override bool Equals(object obj) |
| { |
| if (this == obj) |
| { |
| return true; |
| } |
| if (!base.Equals(obj)) |
| { |
| return false; |
| } |
| if (this.GetType() != obj.GetType()) |
| { |
| return false; |
| } |
| SpanTermQuery other = (SpanTermQuery)obj; |
| if (m_term == null) |
| { |
| if (other.m_term != null) |
| { |
| return false; |
| } |
| } |
| else if (!m_term.Equals(other.m_term)) |
| { |
| return false; |
| } |
| return true; |
| } |
| |
| public override Spans GetSpans(AtomicReaderContext context, IBits acceptDocs, IDictionary<Term, TermContext> termContexts) |
| { |
| TermState state; |
| if (!termContexts.TryGetValue(m_term, out TermContext termContext) || termContext == null) |
| { |
| // this happens with span-not query, as it doesn't include the NOT side in extractTerms() |
| // so we seek to the term now in this segment..., this sucks because its ugly mostly! |
| Fields fields = context.AtomicReader.Fields; |
| if (fields != null) |
| { |
| Terms terms = fields.GetTerms(m_term.Field); |
| if (terms != null) |
| { |
| TermsEnum termsEnum = terms.GetEnumerator(); |
| if (termsEnum.SeekExact(m_term.Bytes)) |
| { |
| state = termsEnum.GetTermState(); |
| } |
| else |
| { |
| state = null; |
| } |
| } |
| else |
| { |
| state = null; |
| } |
| } |
| else |
| { |
| state = null; |
| } |
| } |
| else |
| { |
| state = termContext.Get(context.Ord); |
| } |
| |
| if (state == null) // term is not present in that reader |
| { |
| return TermSpans.EMPTY_TERM_SPANS; |
| } |
| |
| TermsEnum termsEnum_ = context.AtomicReader.GetTerms(m_term.Field).GetEnumerator(); |
| termsEnum_.SeekExact(m_term.Bytes, state); |
| |
| DocsAndPositionsEnum postings = termsEnum_.DocsAndPositions(acceptDocs, null, DocsAndPositionsFlags.PAYLOADS); |
| |
| if (postings != null) |
| { |
| return new TermSpans(postings, m_term); |
| } |
| else |
| { |
| // term does exist, but has no positions |
| throw new InvalidOperationException("field \"" + m_term.Field + "\" was indexed without position data; cannot run SpanTermQuery (term=" + m_term.Text() + ")"); |
| } |
| } |
| } |
| } |