mcs/tools/monkeydoc/Lucene.Net/Lucene.Net/Analysis/KeywordAnalyzer.cs

   1 /*
   2  * Licensed to the Apache Software Foundation (ASF) under one or more
   3  * contributor license agreements.  See the NOTICE file distributed with
   4  * this work for additional information regarding copyright ownership.
   5  * The ASF licenses this file to You under the Apache License, Version 2.0
   6  * (the "License"); you may not use this file except in compliance with
   7  * the License.  You may obtain a copy of the License at
   8  *
   9  * http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 using System;
  19
  20 namespace Mono.Lucene.Net.Analysis
  21 {
  22
  23         /// <summary> "Tokenizes" the entire stream as a single token. This is useful
  24         /// for data like zip codes, ids, and some product names.
  25         /// </summary>
  26         public class KeywordAnalyzer:Analyzer
  27         {
  28                 public KeywordAnalyzer()
  29                 {
  30                         SetOverridesTokenStreamMethod(typeof(KeywordAnalyzer));
  31                 }
  32                 public override TokenStream TokenStream(System.String fieldName, System.IO.TextReader reader)
  33                 {
  34                         return new KeywordTokenizer(reader);
  35                 }
  36                 public override TokenStream ReusableTokenStream(System.String fieldName, System.IO.TextReader reader)
  37                 {
  38                         if (overridesTokenStreamMethod)
  39                         {
  40                                 // LUCENE-1678: force fallback to tokenStream() if we
  41                                 // have been subclassed and that subclass overrides
  42                                 // tokenStream but not reusableTokenStream
  43                                 return TokenStream(fieldName, reader);
  44                         }
  45                         Tokenizer tokenizer = (Tokenizer) GetPreviousTokenStream();
  46                         if (tokenizer == null)
  47                         {
  48                                 tokenizer = new KeywordTokenizer(reader);
  49                                 SetPreviousTokenStream(tokenizer);
  50                         }
  51                         else
  52                                 tokenizer.Reset(reader);
  53                         return tokenizer;
  54                 }
  55         }
  56 }