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MockVariableLengthPayloadFilter.cs
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MockVariableLengthPayloadFilter.cs
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using Lucene.Net.Analysis.TokenAttributes;
using Lucene.Net.Util;
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.
*/
/// <summary>
/// <see cref="TokenFilter"/> that adds random variable-length payloads.
/// </summary>
public sealed class MockVariableLengthPayloadFilter : TokenFilter
{
private const int MAXLENGTH = 129;
private readonly IPayloadAttribute payloadAtt;
private readonly Random random;
private readonly byte[] bytes = new byte[MAXLENGTH];
private readonly BytesRef payload;
public MockVariableLengthPayloadFilter(Random random, TokenStream @in)
: base(@in)
{
this.random = random;
this.payload = new BytesRef(bytes);
this.payloadAtt = AddAttribute<IPayloadAttribute>();
}
public override bool IncrementToken()
{
if (m_input.IncrementToken())
{
random.NextBytes(bytes);
payload.Length = random.Next(MAXLENGTH);
payloadAtt.Payload = payload;
return true;
}
else
{
return false;
}
}
}
}