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MockHoleInjectingTokenFilter.cs
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MockHoleInjectingTokenFilter.cs
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using Lucene.Net.Analysis.TokenAttributes;
using Lucene.Net.Util;
using RandomizedTesting.Generators;
using System;
namespace Lucene.Net.Analysis
{
/*
* 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.
*/
// TODO: maybe, instead to be more "natural", we should make
// a MockRemovesTokensTF, ideally subclassing FilteringTF
// (in modules/analysis)
/// <summary>
/// Randomly injects holes (similar to what a stopfilter would do)
/// </summary>
public sealed class MockHoleInjectingTokenFilter : TokenFilter
{
private readonly long randomSeed;
private Random random;
private readonly IPositionIncrementAttribute posIncAtt;
private readonly IPositionLengthAttribute posLenAtt;
private int maxPos;
private int pos;
public MockHoleInjectingTokenFilter(Random random, TokenStream @in)
: base(@in)
{
randomSeed = random.NextInt64();
posIncAtt = AddAttribute<IPositionIncrementAttribute>();
posLenAtt = AddAttribute<IPositionLengthAttribute>();
}
public override void Reset()
{
base.Reset();
random = new J2N.Randomizer(randomSeed);
maxPos = -1;
pos = -1;
}
public override bool IncrementToken()
{
if (m_input.IncrementToken())
{
int posInc = posIncAtt.PositionIncrement;
int nextPos = pos + posInc;
// Carefully inject a hole only where it won't mess up
// the graph:
if (posInc > 0 && maxPos <= nextPos && random.Next(5) == 3)
{
int holeSize = TestUtil.NextInt32(random, 1, 5);
posIncAtt.PositionIncrement = posInc + holeSize;
nextPos += holeSize;
}
pos = nextPos;
maxPos = Math.Max(maxPos, pos + posLenAtt.PositionLength);
return true;
}
return false;
}
// TODO: end?
}
}