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97 changes: 97 additions & 0 deletions
97
src/Lucene.Net.Analysis.Common/Analysis/Miscellaneous/TypeAsSynonymFilter.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| // Lucene version compatibility level 8.2.0 | ||
| // LUCENENET NOTE: Ported because Lucene.Net.Analysis.OpenNLP requires this to be useful. | ||
| using Lucene.Net.Analysis.TokenAttributes; | ||
| using Lucene.Net.Util; | ||
| #nullable enable | ||
|
|
||
| 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> | ||
| /// Adds the <see cref="ITypeAttribute.Type"/> as a synonym, | ||
| /// i.e. another token at the same position, optionally with a specified prefix prepended. | ||
| /// </summary> | ||
| public sealed class TypeAsSynonymFilter : TokenFilter | ||
| { | ||
| private readonly ICharTermAttribute termAtt; | ||
| private readonly ITypeAttribute typeAtt; | ||
| private readonly IPositionIncrementAttribute posIncrAtt; | ||
| private readonly string? prefix; | ||
|
|
||
| private State? savedToken = null; | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of <see cref="TypeAsSynonymFilter"/> with | ||
| /// the specified token stream. | ||
| /// </summary> | ||
| /// <param name="input">Input token stream.</param> | ||
| public TypeAsSynonymFilter(TokenStream input) | ||
| : this(input, null) | ||
| { | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of <see cref="TypeAsSynonymFilter"/> with | ||
| /// the specified token stream and prefix. | ||
| /// </summary> | ||
| /// <param name="input">Input token stream.</param> | ||
| /// <param name="prefix">Prepend this string to every token type emitted as token text. | ||
| /// If <c>null</c>, nothing will be prepended.</param> | ||
| public TypeAsSynonymFilter(TokenStream input, string? prefix) | ||
| : base(input) | ||
| { | ||
| this.prefix = prefix; | ||
| termAtt = AddAttribute<ICharTermAttribute>(); | ||
| typeAtt = AddAttribute<ITypeAttribute>(); | ||
| posIncrAtt = AddAttribute<IPositionIncrementAttribute>(); | ||
| } | ||
|
|
||
|
|
||
| public override bool IncrementToken() | ||
| { | ||
| if (savedToken != null) | ||
| { | ||
| // Emit last token's type at the same position | ||
| RestoreState(savedToken); | ||
| savedToken = null; | ||
| termAtt.SetEmpty(); | ||
| if (prefix != null) | ||
| { | ||
| termAtt.Append(prefix); | ||
| } | ||
| termAtt.Append(typeAtt.Type); | ||
| posIncrAtt.PositionIncrement = 0; | ||
| return true; | ||
| } | ||
| else if (m_input.IncrementToken()) | ||
| { | ||
| // Ho pending token type to emit | ||
| savedToken = CaptureState(); | ||
| return true; | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| public override void Reset() | ||
| { | ||
| base.Reset(); | ||
| savedToken = null; | ||
| } | ||
| } | ||
| } |
62 changes: 62 additions & 0 deletions
62
src/Lucene.Net.Analysis.Common/Analysis/Miscellaneous/TypeAsSynonymFilterFactory.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // Lucene version compatibility level 8.2.0 | ||
| // LUCENENET NOTE: Ported because Lucene.Net.Analysis.OpenNLP requires this to be useful. | ||
| using Lucene.Net.Analysis.Util; | ||
| using System; | ||
| using System.Collections.Generic; | ||
| #nullable enable | ||
|
|
||
| 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="TypeAsSynonymFilter"/>. | ||
| /// <code> | ||
| /// <fieldType name="text_type_as_synonym" class="solr.TextField" positionIncrementGap="100"> | ||
| /// <analyzer> | ||
| /// <tokenizer class="solr.UAX29URLEmailTokenizerFactory"/> | ||
| /// <filter class="solr.TypeAsSynonymFilterFactory" prefix="_type_" /> | ||
| /// </analyzer> | ||
| /// </fieldType> | ||
| /// </code> | ||
| /// | ||
| /// <para/> | ||
| /// If the optional <c>prefix</c> parameter is used, the specified value will be prepended | ||
| /// to the type, e.g.with prefix = "_type_", for a token "example.com" with type "<URL>", | ||
| /// the emitted synonym will have text "_type_<URL>". | ||
| /// </summary> | ||
| public class TypeAsSynonymFilterFactory : TokenFilterFactory | ||
| { | ||
| private readonly string prefix; | ||
|
|
||
| public TypeAsSynonymFilterFactory(IDictionary<string, string> args) | ||
| : base(args) | ||
| { | ||
| prefix = Get(args, "prefix"); // default value is null | ||
| if (args.Count > 0) | ||
| { | ||
| throw new ArgumentException(string.Format(J2N.Text.StringFormatter.CurrentCulture, "Unknown parameters: {0}", args)); | ||
| } | ||
| } | ||
|
|
||
| public override TokenStream Create(TokenStream input) | ||
| { | ||
| return new TypeAsSynonymFilter(input, prefix); | ||
| } | ||
| } | ||
| } |
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