forked from apache/lucenenet
/
Lucene46SegmentInfoReader.cs
93 lines (85 loc) · 3.57 KB
/
Lucene46SegmentInfoReader.cs
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using System.Collections.Generic;
namespace Lucene.Net.Codecs.Lucene46
{
/*
* 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 ChecksumIndexInput = Lucene.Net.Store.ChecksumIndexInput;
using CorruptIndexException = Lucene.Net.Index.CorruptIndexException;
using Directory = Lucene.Net.Store.Directory;
using IndexFileNames = Lucene.Net.Index.IndexFileNames;
using IOContext = Lucene.Net.Store.IOContext;
using IOUtils = Lucene.Net.Util.IOUtils;
using SegmentInfo = Lucene.Net.Index.SegmentInfo;
/// <summary>
/// Lucene 4.6 implementation of <see cref="SegmentInfoReader"/>.
/// <para/>
/// @lucene.experimental
/// </summary>
/// <seealso cref="Lucene46SegmentInfoFormat"/>
public class Lucene46SegmentInfoReader : SegmentInfoReader
{
/// <summary>
/// Sole constructor. </summary>
public Lucene46SegmentInfoReader()
{
}
public override SegmentInfo Read(Directory dir, string segment, IOContext context)
{
string fileName = IndexFileNames.SegmentFileName(segment, "", Lucene46SegmentInfoFormat.SI_EXTENSION);
ChecksumIndexInput input = dir.OpenChecksumInput(fileName, context);
bool success = false;
try
{
int codecVersion = CodecUtil.CheckHeader(input, Lucene46SegmentInfoFormat.CODEC_NAME, Lucene46SegmentInfoFormat.VERSION_START, Lucene46SegmentInfoFormat.VERSION_CURRENT);
string version = input.ReadString();
int docCount = input.ReadInt32();
if (docCount < 0)
{
throw new CorruptIndexException("invalid docCount: " + docCount + " (resource=" + input + ")");
}
bool isCompoundFile = input.ReadByte() == SegmentInfo.YES;
IDictionary<string, string> diagnostics = input.ReadStringStringMap();
ISet<string> files = input.ReadStringSet();
if (codecVersion >= Lucene46SegmentInfoFormat.VERSION_CHECKSUM)
{
CodecUtil.CheckFooter(input);
}
else
{
#pragma warning disable 612, 618
CodecUtil.CheckEOF(input);
#pragma warning restore 612, 618
}
SegmentInfo si = new SegmentInfo(dir, version, segment, docCount, isCompoundFile, null, diagnostics);
si.SetFiles(files);
success = true;
return si;
}
finally
{
if (!success)
{
IOUtils.DisposeWhileHandlingException(input);
}
else
{
input.Dispose();
}
}
}
}
}