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LimitTokenCountFilterFactory.cs
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LimitTokenCountFilterFactory.cs
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using Lucene.Net.Analysis.Util;
using System.Collections.Generic;
namespace Lucene.Net.Analysis.Miscellaneous
{
/*
* 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>
/// Factory for <see cref="LimitTokenCountFilter"/>.
/// <code>
/// <fieldType name="text_lngthcnt" class="solr.TextField" positionIncrementGap="100">
/// <analyzer>
/// <tokenizer class="solr.WhitespaceTokenizerFactory"/>
/// <filter class="solr.LimitTokenCountFilterFactory" maxTokenCount="10" consumeAllTokens="false" />
/// </analyzer>
/// </fieldType></code>
/// <para>
/// The <see cref="consumeAllTokens"/> property is optional and defaults to <c>false</c>.
/// See <see cref="LimitTokenCountFilter"/> for an explanation of it's use.
/// </para>
/// </summary>
public class LimitTokenCountFilterFactory : TokenFilterFactory
{
public const string MAX_TOKEN_COUNT_KEY = "maxTokenCount";
public const string CONSUME_ALL_TOKENS_KEY = "consumeAllTokens";
private readonly int maxTokenCount;
private readonly bool consumeAllTokens;
/// <summary>
/// Creates a new <see cref="LimitTokenCountFilterFactory"/> </summary>
public LimitTokenCountFilterFactory(IDictionary<string, string> args)
: base(args)
{
maxTokenCount = RequireInt32(args, MAX_TOKEN_COUNT_KEY);
consumeAllTokens = GetBoolean(args, CONSUME_ALL_TOKENS_KEY, false);
if (args.Count > 0)
{
throw new System.ArgumentException("Unknown parameters: " + args);
}
}
public override TokenStream Create(TokenStream input)
{
return new LimitTokenCountFilter(input, maxTokenCount, consumeAllTokens);
}
}
}