| using Lucene.Net.Diagnostics; |
| using Lucene.Net.Support; |
| using System; |
| using System.Diagnostics; |
| using System.Diagnostics.CodeAnalysis; |
| |
| namespace Lucene.Net.Codecs |
| { |
| /* |
| * 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 DocsEnum = Lucene.Net.Index.DocsEnum; |
| using MergeState = Lucene.Net.Index.MergeState; |
| using MultiDocsEnum = Lucene.Net.Index.MultiDocsEnum; |
| |
| /// <summary> |
| /// Exposes flex API, merged from flex API of sub-segments, |
| /// remapping docIDs (this is used for segment merging). |
| /// <para/> |
| /// @lucene.experimental |
| /// </summary> |
| public sealed class MappingMultiDocsEnum : DocsEnum |
| { |
| private MultiDocsEnum.EnumWithSlice[] subs; |
| internal int numSubs; |
| internal int upto; |
| internal MergeState.DocMap currentMap; |
| internal DocsEnum current; |
| internal int currentBase; |
| internal int doc = -1; |
| private MergeState mergeState; |
| |
| /// <summary> |
| /// Sole constructor. </summary> |
| public MappingMultiDocsEnum() |
| { |
| } |
| |
| internal MappingMultiDocsEnum Reset(MultiDocsEnum docsEnum) |
| { |
| this.numSubs = docsEnum.NumSubs; |
| this.subs = docsEnum.Subs; |
| upto = -1; |
| current = null; |
| return this; |
| } |
| |
| /// <summary> |
| /// Sets the <see cref="MergeState"/>, which is used to re-map |
| /// document IDs. |
| /// </summary> |
| public MergeState MergeState |
| { |
| get => this.mergeState; // LUCENENET specific - per MSDN properties should always have a getter |
| set => this.mergeState = value; |
| } |
| |
| /// <summary> |
| /// How many sub-readers we are merging. </summary> |
| /// <seealso cref="Subs"/> |
| public int NumSubs => numSubs; |
| |
| /// <summary> |
| /// Returns sub-readers we are merging. </summary> |
| [WritableArray] |
| [SuppressMessage("Microsoft.Performance", "CA1819", Justification = "Lucene's design requires some writable array properties")] |
| public MultiDocsEnum.EnumWithSlice[] Subs => subs; |
| |
| public override int Freq => current.Freq; |
| |
| public override int DocID => doc; |
| |
| public override int Advance(int target) |
| { |
| throw new NotSupportedException(); |
| } |
| |
| public override int NextDoc() |
| { |
| while (true) |
| { |
| if (current == null) |
| { |
| if (upto == numSubs - 1) |
| { |
| return this.doc = NO_MORE_DOCS; |
| } |
| else |
| { |
| upto++; |
| int reader = subs[upto].Slice.ReaderIndex; |
| current = subs[upto].DocsEnum; |
| currentBase = mergeState.DocBase[reader]; |
| currentMap = mergeState.DocMaps[reader]; |
| if (Debugging.AssertsEnabled) Debugging.Assert(currentMap.MaxDoc == subs[upto].Slice.Length, () => "readerIndex=" + reader + " subs.len=" + subs.Length + " len1=" + currentMap.MaxDoc + " vs " + subs[upto].Slice.Length); |
| } |
| } |
| |
| int doc = current.NextDoc(); |
| if (doc != NO_MORE_DOCS) |
| { |
| // compact deletions |
| doc = currentMap.Get(doc); |
| if (doc == -1) |
| { |
| continue; |
| } |
| return this.doc = currentBase + doc; |
| } |
| else |
| { |
| current = null; |
| } |
| } |
| } |
| |
| public override long GetCost() |
| { |
| long cost = 0; |
| foreach (MultiDocsEnum.EnumWithSlice enumWithSlice in subs) |
| { |
| cost += enumWithSlice.DocsEnum.GetCost(); |
| } |
| return cost; |
| } |
| } |
| } |