| using Lucene.Net.Support; |
| using System; |
| using System.Runtime.CompilerServices; |
| |
| namespace Lucene.Net.Codecs.Lucene3x |
| { |
| /* |
| * 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 IndexInput = Lucene.Net.Store.IndexInput; |
| |
| [Obsolete("(4.0) this is only used to read indexes created before 4.0.")] |
| internal sealed class Lucene3xSkipListReader : MultiLevelSkipListReader |
| { |
| private bool currentFieldStoresPayloads; |
| private readonly long[] freqPointer; // LUCENENET: marked readonly |
| private readonly long[] proxPointer; // LUCENENET: marked readonly |
| private readonly int[] payloadLength; // LUCENENET: marked readonly |
| |
| private long lastFreqPointer; |
| private long lastProxPointer; |
| private int lastPayloadLength; |
| |
| public Lucene3xSkipListReader(IndexInput skipStream, int maxSkipLevels, int skipInterval) |
| : base(skipStream, maxSkipLevels, skipInterval) |
| { |
| freqPointer = new long[maxSkipLevels]; |
| proxPointer = new long[maxSkipLevels]; |
| payloadLength = new int[maxSkipLevels]; |
| } |
| |
| public void Init(long skipPointer, long freqBasePointer, long proxBasePointer, int df, bool storesPayloads) |
| { |
| base.Init(skipPointer, df); |
| this.currentFieldStoresPayloads = storesPayloads; |
| lastFreqPointer = freqBasePointer; |
| lastProxPointer = proxBasePointer; |
| |
| Arrays.Fill(freqPointer, freqBasePointer); |
| Arrays.Fill(proxPointer, proxBasePointer); |
| Arrays.Fill(payloadLength, 0); |
| } |
| |
| /// <summary> |
| /// Returns the freq pointer of the doc to which the last call of |
| /// <see cref="MultiLevelSkipListReader.SkipTo(int)"/> has skipped. |
| /// </summary> |
| public long FreqPointer => lastFreqPointer; |
| |
| /// <summary> |
| /// Returns the prox pointer of the doc to which the last call of |
| /// <see cref="MultiLevelSkipListReader.SkipTo(int)"/> has skipped. |
| /// </summary> |
| public long ProxPointer => lastProxPointer; |
| |
| /// <summary> |
| /// Returns the payload length of the payload stored just before |
| /// the doc to which the last call of <see cref="MultiLevelSkipListReader.SkipTo(int)"/> |
| /// has skipped. |
| /// </summary> |
| public int PayloadLength => lastPayloadLength; |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| protected override void SeekChild(int level) |
| { |
| base.SeekChild(level); |
| freqPointer[level] = lastFreqPointer; |
| proxPointer[level] = lastProxPointer; |
| payloadLength[level] = lastPayloadLength; |
| } |
| |
| [MethodImpl(MethodImplOptions.AggressiveInlining)] |
| protected override void SetLastSkipData(int level) |
| { |
| base.SetLastSkipData(level); |
| lastFreqPointer = freqPointer[level]; |
| lastProxPointer = proxPointer[level]; |
| lastPayloadLength = payloadLength[level]; |
| } |
| |
| protected override int ReadSkipData(int level, IndexInput skipStream) |
| { |
| int delta; |
| if (currentFieldStoresPayloads) |
| { |
| // the current field stores payloads. |
| // if the doc delta is odd then we have |
| // to read the current payload length |
| // because it differs from the length of the |
| // previous payload |
| delta = skipStream.ReadVInt32(); |
| if ((delta & 1) != 0) |
| { |
| payloadLength[level] = skipStream.ReadVInt32(); |
| } |
| delta = (int)((uint)delta >> 1); |
| } |
| else |
| { |
| delta = skipStream.ReadVInt32(); |
| } |
| |
| freqPointer[level] += skipStream.ReadVInt32(); |
| proxPointer[level] += skipStream.ReadVInt32(); |
| |
| return delta; |
| } |
| } |
| } |