| /* |
| * 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 System; |
| using Lucene.Net.Support; |
| using IndexInput = Lucene.Net.Store.IndexInput; |
| using BitVector = Lucene.Net.Util.BitVector; |
| |
| namespace Lucene.Net.Index |
| { |
| |
| internal class SegmentTermDocs : TermDocs |
| { |
| protected internal SegmentReader parent; |
| protected internal IndexInput freqStream; |
| protected internal int count; |
| protected internal int df; |
| protected internal BitVector deletedDocs; |
| internal int doc = 0; |
| internal int freq; |
| |
| private readonly int skipInterval; |
| private readonly int maxSkipLevels; |
| private DefaultSkipListReader skipListReader; |
| |
| private long freqBasePointer; |
| private long proxBasePointer; |
| |
| private long skipPointer; |
| private bool haveSkipped; |
| |
| protected internal bool currentFieldStoresPayloads; |
| protected internal bool currentFieldOmitTermFreqAndPositions; |
| |
| private bool isDisposed; |
| |
| public /*protected internal*/ SegmentTermDocs(SegmentReader parent) |
| { |
| this.parent = parent; |
| this.freqStream = (IndexInput) parent.core.freqStream.Clone(); |
| lock (parent) |
| { |
| this.deletedDocs = parent.deletedDocs; |
| } |
| this.skipInterval = parent.core.GetTermsReader().SkipInterval; |
| this.maxSkipLevels = parent.core.GetTermsReader().MaxSkipLevels; |
| } |
| |
| public virtual void Seek(Term term) |
| { |
| TermInfo ti = parent.core.GetTermsReader().Get(term); |
| Seek(ti, term); |
| } |
| |
| public virtual void Seek(TermEnum termEnum) |
| { |
| TermInfo ti; |
| Term term; |
| |
| // use comparison of fieldinfos to verify that termEnum belongs to the same segment as this SegmentTermDocs |
| if (termEnum is SegmentTermEnum && ((SegmentTermEnum) termEnum).fieldInfos == parent.core.fieldInfos) |
| { |
| // optimized case |
| var segmentTermEnum = ((SegmentTermEnum) termEnum); |
| term = segmentTermEnum.Term; |
| ti = segmentTermEnum.TermInfo(); |
| } |
| else |
| { |
| // punt case |
| term = termEnum.Term; |
| ti = parent.core.GetTermsReader().Get(term); |
| } |
| |
| Seek(ti, term); |
| } |
| |
| internal virtual void Seek(TermInfo ti, Term term) |
| { |
| count = 0; |
| FieldInfo fi = parent.core.fieldInfos.FieldInfo(term.Field); |
| currentFieldOmitTermFreqAndPositions = (fi != null) && fi.omitTermFreqAndPositions; |
| currentFieldStoresPayloads = (fi != null) && fi.storePayloads; |
| if (ti == null) |
| { |
| df = 0; |
| } |
| else |
| { |
| df = ti.docFreq; |
| doc = 0; |
| freqBasePointer = ti.freqPointer; |
| proxBasePointer = ti.proxPointer; |
| skipPointer = freqBasePointer + ti.skipOffset; |
| freqStream.Seek(freqBasePointer); |
| haveSkipped = false; |
| } |
| } |
| |
| public void Dispose() |
| { |
| Dispose(true); |
| } |
| |
| [Obsolete("Use Dispose() instead")] |
| public void Close() |
| { |
| Dispose(); |
| } |
| |
| protected virtual void Dispose(bool disposing) |
| { |
| if (isDisposed) return; |
| |
| freqStream.Dispose(); |
| if (skipListReader != null) |
| skipListReader.Dispose(); |
| |
| isDisposed = true; |
| } |
| |
| public int Doc |
| { |
| get { return doc; } |
| } |
| |
| public int Freq |
| { |
| get { return freq; } |
| } |
| |
| protected internal virtual void SkippingDoc() |
| { |
| } |
| |
| public virtual bool Next() |
| { |
| while (true) |
| { |
| if (count == df) |
| return false; |
| int docCode = freqStream.ReadVInt(); |
| |
| if (currentFieldOmitTermFreqAndPositions) |
| { |
| doc += docCode; |
| freq = 1; |
| } |
| else |
| { |
| doc += Number.URShift(docCode, 1); // shift off low bit |
| if ((docCode & 1) != 0) |
| // if low bit is set |
| freq = 1; |
| // freq is one |
| else |
| freq = freqStream.ReadVInt(); // else read freq |
| } |
| |
| count++; |
| |
| if (deletedDocs == null || !deletedDocs.Get(doc)) |
| break; |
| SkippingDoc(); |
| } |
| return true; |
| } |
| |
| /// <summary>Optimized implementation. </summary> |
| public virtual int Read(int[] docs, int[] freqs) |
| { |
| int length = docs.Length; |
| if (currentFieldOmitTermFreqAndPositions) |
| { |
| return ReadNoTf(docs, freqs, length); |
| } |
| else |
| { |
| int i = 0; |
| while (i < length && count < df) |
| { |
| // manually inlined call to next() for speed |
| int docCode = freqStream.ReadVInt(); |
| doc += Number.URShift(docCode, 1); // shift off low bit |
| if ((docCode & 1) != 0) |
| // if low bit is set |
| freq = 1; |
| // freq is one |
| else |
| freq = freqStream.ReadVInt(); // else read freq |
| count++; |
| |
| if (deletedDocs == null || !deletedDocs.Get(doc)) |
| { |
| docs[i] = doc; |
| freqs[i] = freq; |
| ++i; |
| } |
| } |
| return i; |
| } |
| } |
| |
| private int ReadNoTf(int[] docs, int[] freqs, int length) |
| { |
| int i = 0; |
| while (i < length && count < df) |
| { |
| // manually inlined call to next() for speed |
| doc += freqStream.ReadVInt(); |
| count++; |
| |
| if (deletedDocs == null || !deletedDocs.Get(doc)) |
| { |
| docs[i] = doc; |
| // Hardware freq to 1 when term freqs were not |
| // stored in the index |
| freqs[i] = 1; |
| ++i; |
| } |
| } |
| return i; |
| } |
| |
| |
| /// <summary>Overridden by SegmentTermPositions to skip in prox stream. </summary> |
| protected internal virtual void SkipProx(long proxPointer, int payloadLength) |
| { |
| } |
| |
| /// <summary>Optimized implementation. </summary> |
| public virtual bool SkipTo(int target) |
| { |
| if (df >= skipInterval) |
| { |
| // optimized case |
| if (skipListReader == null) |
| skipListReader = new DefaultSkipListReader((IndexInput) freqStream.Clone(), maxSkipLevels, skipInterval); // lazily clone |
| |
| if (!haveSkipped) |
| { |
| // lazily initialize skip stream |
| skipListReader.Init(skipPointer, freqBasePointer, proxBasePointer, df, currentFieldStoresPayloads); |
| haveSkipped = true; |
| } |
| |
| int newCount = skipListReader.SkipTo(target); |
| if (newCount > count) |
| { |
| freqStream.Seek(skipListReader.GetFreqPointer()); |
| SkipProx(skipListReader.GetProxPointer(), skipListReader.GetPayloadLength()); |
| |
| doc = skipListReader.GetDoc(); |
| count = newCount; |
| } |
| } |
| |
| // done skipping, now just scan |
| do |
| { |
| if (!Next()) |
| return false; |
| } |
| while (target > doc); |
| return true; |
| } |
| } |
| } |