blob: f2a22e05974087a6f0fde62e0e76ef0f1727a00a [file] [log] [blame]
using Lucene.Net.Diagnostics;
using Lucene.Net.Index;
using Lucene.Net.Util;
using System.Diagnostics;
namespace Lucene.Net.Codecs.Pulsing
{
/*
* 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>
/// This postings format "inlines" the postings for terms that have
/// low docFreq. It wraps another postings format, which is used for
/// writing the non-inlined terms.
/// <para/>
/// @lucene.experimental
/// </summary>
public abstract class PulsingPostingsFormat : PostingsFormat
{
private readonly int _freqCutoff;
private readonly int _minBlockSize;
private readonly int _maxBlockSize;
private readonly PostingsBaseFormat _wrappedPostingsBaseFormat;
protected PulsingPostingsFormat(PostingsBaseFormat wrappedPostingsBaseFormat, int freqCutoff) // LUCENENET: CA1012: Abstract types should not have constructors (marked protected)
: this(wrappedPostingsBaseFormat, freqCutoff, BlockTreeTermsWriter.DEFAULT_MIN_BLOCK_SIZE,
BlockTreeTermsWriter.DEFAULT_MAX_BLOCK_SIZE)
{
}
/// <summary>Terms with freq less than or equal <paramref name="freqCutoff"/> are inlined into terms dict.</summary>
protected PulsingPostingsFormat(PostingsBaseFormat wrappedPostingsBaseFormat, int freqCutoff,
int minBlockSize, int maxBlockSize) // LUCENENET: CA1012: Abstract types should not have constructors (marked protected)
: base()
{
if (Debugging.AssertsEnabled) Debugging.Assert(minBlockSize > 1);
_freqCutoff = freqCutoff;
_minBlockSize = minBlockSize;
_maxBlockSize = maxBlockSize;
_wrappedPostingsBaseFormat = wrappedPostingsBaseFormat;
}
public override string ToString()
{
return string.Format("{0} (freqCutoff={1}, minBlockSize={2}, maxBlockSize={3})", Name, _freqCutoff, _minBlockSize, _maxBlockSize);
}
public override FieldsConsumer FieldsConsumer(SegmentWriteState state)
{
PostingsWriterBase docsWriter = null;
// Terms that have <= freqCutoff number of docs are
// "pulsed" (inlined):
PostingsWriterBase pulsingWriter = null;
// Terms dict
bool success = false;
try
{
docsWriter = _wrappedPostingsBaseFormat.PostingsWriterBase(state);
// Terms that have <= freqCutoff number of docs are
// "pulsed" (inlined):
pulsingWriter = new PulsingPostingsWriter(state, _freqCutoff, docsWriter);
FieldsConsumer ret = new BlockTreeTermsWriter(state, pulsingWriter, _minBlockSize, _maxBlockSize);
success = true;
return ret;
}
finally
{
if (!success)
{
IOUtils.DisposeWhileHandlingException(docsWriter, pulsingWriter);
}
}
}
public override FieldsProducer FieldsProducer(SegmentReadState state)
{
PostingsReaderBase docsReader = null;
PostingsReaderBase pulsingReader = null;
bool success = false;
try
{
docsReader = _wrappedPostingsBaseFormat.PostingsReaderBase(state);
pulsingReader = new PulsingPostingsReader(state, docsReader);
FieldsProducer ret = new BlockTreeTermsReader(
state.Directory, state.FieldInfos, state.SegmentInfo,
pulsingReader,
state.Context,
state.SegmentSuffix,
state.TermsIndexDivisor);
success = true;
return ret;
}
finally
{
if (!success)
{
IOUtils.DisposeWhileHandlingException(docsReader, pulsingReader);
}
}
}
public virtual int FreqCutoff => _freqCutoff;
}
}