| using Lucene.Net.Diagnostics; |
| using Lucene.Net.Index; |
| |
| namespace Lucene.Net.Search |
| { |
| /* |
| * 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 AtomicReader = Lucene.Net.Index.AtomicReader; |
| using AtomicReaderContext = Lucene.Net.Index.AtomicReaderContext; |
| using DocsEnum = Lucene.Net.Index.DocsEnum; |
| using Fields = Lucene.Net.Index.Fields; |
| using FixedBitSet = Lucene.Net.Util.FixedBitSet; |
| using IBits = Lucene.Net.Util.IBits; |
| using Terms = Lucene.Net.Index.Terms; |
| using TermsEnum = Lucene.Net.Index.TermsEnum; |
| |
| /// <summary> |
| /// A wrapper for <see cref="MultiTermQuery"/>, that exposes its |
| /// functionality as a <see cref="Filter"/>. |
| /// <para/> |
| /// <see cref="MultiTermQueryWrapperFilter{Q}"/> is not designed to |
| /// be used by itself. Normally you subclass it to provide a <see cref="Filter"/> |
| /// counterpart for a <see cref="MultiTermQuery"/> subclass. |
| /// <para/> |
| /// For example, <see cref="TermRangeFilter"/> and <see cref="PrefixFilter"/> extend |
| /// <see cref="MultiTermQueryWrapperFilter{Q}"/>. |
| /// This class also provides the functionality behind |
| /// <see cref="MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE"/>; |
| /// this is why it is not abstract. |
| /// </summary> |
| public class MultiTermQueryWrapperFilter<Q> : Filter where Q : MultiTermQuery |
| { |
| protected readonly Q m_query; |
| |
| /// <summary> |
| /// Wrap a <see cref="MultiTermQuery"/> as a <see cref="Filter"/>. |
| /// </summary> |
| protected internal MultiTermQueryWrapperFilter(Q query) |
| { |
| this.m_query = query; |
| } |
| |
| public override string ToString() |
| { |
| // query.toString should be ok for the filter, too, if the query boost is 1.0f |
| return m_query.ToString(); |
| } |
| |
| public override sealed bool Equals(object o) |
| { |
| if (o == this) |
| { |
| return true; |
| } |
| if (o == null) |
| { |
| return false; |
| } |
| if (this.GetType().Equals(o.GetType())) |
| { |
| return this.m_query.Equals(((MultiTermQueryWrapperFilter<Q>)o).m_query); |
| } |
| return false; |
| } |
| |
| public override sealed int GetHashCode() |
| { |
| return m_query.GetHashCode(); |
| } |
| |
| /// <summary> |
| /// Returns the field name for this query </summary> |
| public string Field => m_query.Field; |
| |
| /// <summary> |
| /// Returns a <see cref="DocIdSet"/> with documents that should be permitted in search |
| /// results. |
| /// </summary> |
| public override DocIdSet GetDocIdSet(AtomicReaderContext context, IBits acceptDocs) |
| { |
| AtomicReader reader = (context.AtomicReader); |
| Fields fields = reader.Fields; |
| if (fields == null) |
| { |
| // reader has no fields |
| return null; |
| } |
| |
| Terms terms = fields.GetTerms(m_query.m_field); |
| if (terms == null) |
| { |
| // field does not exist |
| return null; |
| } |
| |
| TermsEnum termsEnum = m_query.GetTermsEnum(terms); |
| if (Debugging.AssertsEnabled) Debugging.Assert(termsEnum != null); |
| if (termsEnum.MoveNext()) |
| { |
| // fill into a FixedBitSet |
| FixedBitSet bitSet = new FixedBitSet(context.AtomicReader.MaxDoc); |
| DocsEnum docsEnum = null; |
| do |
| { |
| // System.out.println(" iter termCount=" + termCount + " term=" + |
| // enumerator.term().toBytesString()); |
| docsEnum = termsEnum.Docs(acceptDocs, docsEnum, DocsFlags.NONE); |
| int docid; |
| while ((docid = docsEnum.NextDoc()) != DocIdSetIterator.NO_MORE_DOCS) |
| { |
| bitSet.Set(docid); |
| } |
| } while (termsEnum.MoveNext()); |
| |
| return bitSet; |
| } |
| else |
| { |
| return null; |
| } |
| } |
| } |
| } |