| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Index |
| { |
| /* |
| * 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. |
| */ |
| |
| /// <summary> |
| /// A <see cref="MergePolicy"/> which never returns merges to execute (hence it's |
| /// name). It is also a singleton and can be accessed through |
| /// <see cref="NoMergePolicy.NO_COMPOUND_FILES"/> if you want to indicate the index |
| /// does not use compound files, or through <see cref="NoMergePolicy.COMPOUND_FILES"/> |
| /// otherwise. Use it if you want to prevent an <see cref="IndexWriter"/> from ever |
| /// executing merges, without going through the hassle of tweaking a merge |
| /// policy's settings to achieve that, such as changing its merge factor. |
| /// </summary> |
| public sealed class NoMergePolicy : MergePolicy |
| { |
| /// <summary> |
| /// A singleton <see cref="NoMergePolicy"/> which indicates the index does not use |
| /// compound files. |
| /// </summary> |
| public static readonly MergePolicy NO_COMPOUND_FILES = new NoMergePolicy(false); |
| |
| /// <summary> |
| /// A singleton <see cref="NoMergePolicy"/> which indicates the index uses compound |
| /// files. |
| /// </summary> |
| public static readonly MergePolicy COMPOUND_FILES = new NoMergePolicy(true); |
| |
| private readonly bool useCompoundFile; |
| |
| private NoMergePolicy(bool useCompoundFile) |
| : base(useCompoundFile ? 1.0 : 0.0, 0) |
| { |
| // prevent instantiation |
| this.useCompoundFile = useCompoundFile; |
| } |
| |
| protected override void Dispose(bool disposing) |
| { |
| } |
| |
| public override MergeSpecification FindMerges(MergeTrigger mergeTrigger, SegmentInfos segmentInfos) |
| { |
| return null; |
| } |
| |
| public override MergeSpecification FindForcedMerges(SegmentInfos segmentInfos, int maxSegmentCount, IDictionary<SegmentCommitInfo, bool?> segmentsToMerge) |
| { |
| return null; |
| } |
| |
| public override MergeSpecification FindForcedDeletesMerges(SegmentInfos segmentInfos) |
| { |
| return null; |
| } |
| |
| public override bool UseCompoundFile(SegmentInfos segments, SegmentCommitInfo newSegment) |
| { |
| return useCompoundFile; |
| } |
| |
| public override void SetIndexWriter(IndexWriter writer) |
| { |
| } |
| |
| protected override long Size(SegmentCommitInfo info) |
| { |
| return long.MaxValue; |
| } |
| |
| public override string ToString() |
| { |
| return "NoMergePolicy"; |
| } |
| } |
| } |