| using Lucene.Net.Diagnostics; |
| using System; |
| using System.Collections.Generic; |
| |
| 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 AtomicReaderContext = Lucene.Net.Index.AtomicReaderContext; |
| using BytesRef = Lucene.Net.Util.BytesRef; |
| using IBits = Lucene.Net.Util.IBits; |
| using IndexReader = Lucene.Net.Index.IndexReader; |
| using Int64BitSet = Lucene.Net.Util.Int64BitSet; |
| using SortedSetDocValues = Lucene.Net.Index.SortedSetDocValues; |
| using Terms = Lucene.Net.Index.Terms; |
| using TermsEnum = Lucene.Net.Index.TermsEnum; |
| |
| /// <summary> |
| /// Rewrites <see cref="MultiTermQuery"/>s into a filter, using DocTermOrds for term enumeration. |
| /// <para> |
| /// This can be used to perform these queries against an unindexed docvalues field. |
| /// </para> |
| /// @lucene.experimental |
| /// </summary> |
| public sealed class DocTermOrdsRewriteMethod : MultiTermQuery.RewriteMethod |
| { |
| public override Query Rewrite(IndexReader reader, MultiTermQuery query) |
| { |
| Query result = new ConstantScoreQuery(new MultiTermQueryDocTermOrdsWrapperFilter(query)); |
| result.Boost = query.Boost; |
| return result; |
| } |
| |
| internal class MultiTermQueryDocTermOrdsWrapperFilter : Filter |
| { |
| protected readonly MultiTermQuery m_query; |
| |
| /// <summary> |
| /// Wrap a <see cref="MultiTermQuery"/> as a <see cref="Filter"/>. |
| /// </summary> |
| protected internal MultiTermQueryDocTermOrdsWrapperFilter(MultiTermQuery 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(((MultiTermQueryDocTermOrdsWrapperFilter)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) |
| { |
| SortedSetDocValues docTermOrds = FieldCache.DEFAULT.GetDocTermOrds((context.AtomicReader), m_query.m_field); |
| // Cannot use FixedBitSet because we require long index (ord): |
| Int64BitSet termSet = new Int64BitSet(docTermOrds.ValueCount); |
| TermsEnum termsEnum = m_query.GetTermsEnum(new TermsAnonymousInnerClassHelper(docTermOrds)); |
| |
| if (Debugging.AssertsEnabled) Debugging.Assert(termsEnum != null); |
| if (termsEnum.MoveNext()) |
| { |
| // fill into a bitset |
| do |
| { |
| termSet.Set(termsEnum.Ord); |
| } while (termsEnum.MoveNext()); |
| } |
| else |
| { |
| return null; |
| } |
| return new FieldCacheDocIdSet(context.Reader.MaxDoc, acceptDocs, (doc) => |
| { |
| docTermOrds.SetDocument(doc); |
| long ord; |
| // TODO: we could track max bit set and early terminate (since they come in sorted order) |
| while ((ord = docTermOrds.NextOrd()) != SortedSetDocValues.NO_MORE_ORDS) |
| { |
| if (termSet.Get(ord)) |
| { |
| return true; |
| } |
| } |
| return false; |
| }); |
| } |
| |
| private class TermsAnonymousInnerClassHelper : Terms |
| { |
| private readonly SortedSetDocValues docTermOrds; |
| |
| public TermsAnonymousInnerClassHelper(SortedSetDocValues docTermOrds) |
| { |
| this.docTermOrds = docTermOrds; |
| } |
| |
| public override IComparer<BytesRef> Comparer => BytesRef.UTF8SortedAsUnicodeComparer; |
| |
| public override TermsEnum GetEnumerator() |
| { |
| return docTermOrds.GetTermsEnum(); |
| } |
| |
| public override long SumTotalTermFreq => -1; |
| |
| public override long SumDocFreq => -1; |
| |
| public override int DocCount => -1; |
| |
| public override long Count => -1; |
| |
| public override bool HasFreqs => false; |
| |
| public override bool HasOffsets => false; |
| |
| public override bool HasPositions => false; |
| |
| public override bool HasPayloads => false; |
| } |
| } |
| |
| public override bool Equals(object obj) |
| { |
| if (this == obj) |
| { |
| return true; |
| } |
| if (obj == null) |
| { |
| return false; |
| } |
| if (this.GetType() != obj.GetType()) |
| { |
| return false; |
| } |
| return true; |
| } |
| |
| public override int GetHashCode() |
| { |
| return 877; |
| } |
| } |
| } |