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MockPayloadAnalyzer.cs
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MockPayloadAnalyzer.cs
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using Lucene.Net.Analysis.TokenAttributes;
using System.IO;
using System.Text;
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.
*/
using BytesRef = Lucene.Net.Util.BytesRef;
/// <summary>
/// Wraps a whitespace tokenizer with a filter that sets
/// the first token, and odd tokens to posinc=1, and all others
/// to 0, encoding the position as pos: XXX in the payload.
/// </summary>
public sealed class MockPayloadAnalyzer : Analyzer
{
protected internal override TokenStreamComponents CreateComponents(string fieldName, TextReader reader)
{
Tokenizer result = new MockTokenizer(reader, MockTokenizer.WHITESPACE, true);
return new TokenStreamComponents(result, new MockPayloadFilter(result, fieldName));
}
}
internal sealed class MockPayloadFilter : TokenFilter
{
internal string fieldName;
internal int pos;
internal int i;
internal readonly IPositionIncrementAttribute posIncrAttr;
internal readonly IPayloadAttribute payloadAttr;
internal readonly ICharTermAttribute termAttr;
public MockPayloadFilter(TokenStream input, string fieldName)
: base(input)
{
this.fieldName = fieldName;
pos = 0;
i = 0;
posIncrAttr = input.AddAttribute<IPositionIncrementAttribute>();
payloadAttr = input.AddAttribute<IPayloadAttribute>();
termAttr = input.AddAttribute<ICharTermAttribute>();
}
public override bool IncrementToken()
{
if (m_input.IncrementToken())
{
payloadAttr.Payload = new BytesRef(Encoding.UTF8.GetBytes("pos: " + pos));
int posIncr;
if (pos == 0 || i % 2 == 1)
{
posIncr = 1;
}
else
{
posIncr = 0;
}
posIncrAttr.PositionIncrement = posIncr;
pos += posIncr;
i++;
return true;
}
else
{
return false;
}
}
public override void Reset()
{
base.Reset();
i = 0;
pos = 0;
}
}
}