PerFieldAnalyzerWrapper.cs :  » Search-Engines » dotLucene » Lucene » Net » Analysis » C# / CSharp Open Source

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C# / CSharp Open Source » Search Engines » dotLucene 
dotLucene » Lucene » Net » Analysis » PerFieldAnalyzerWrapper.cs
/*
 * Copyright 2004 The Apache Software Foundation
 * 
 * Licensed 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 System;

namespace Lucene.Net.Analysis{
  
  /// <summary> This analyzer is used to facilitate scenarios where different
  /// fields require different analysis techniques.  Use {@link #addAnalyzer}
  /// to add a non-default analyzer on a field name basis.
  /// 
  /// <p>Example usage:
  /// 
  /// <pre>
  /// PerFieldAnalyzerWrapper aWrapper =
  /// new PerFieldAnalyzerWrapper(new StandardAnalyzer());
  /// aWrapper.addAnalyzer("firstname", new KeywordAnalyzer());
  /// aWrapper.addAnalyzer("lastname", new KeywordAnalyzer());
  /// </pre>
  /// 
  /// <p>In this example, StandardAnalyzer will be used for all fields except "firstname"
  /// and "lastname", for which KeywordAnalyzer will be used.
  /// 
  /// <p>A PerFieldAnalyzerWrapper can be used like any other analyzer, for both indexing
  /// and query parsing.
  /// </summary>
  public class PerFieldAnalyzerWrapper:Analyzer
  {
    private Analyzer defaultAnalyzer;
    private System.Collections.IDictionary analyzerMap = new System.Collections.Hashtable();
    
    
    /// <summary> Constructs with default analyzer.
    /// 
    /// </summary>
    /// <param name="defaultAnalyzer">Any fields not specifically
    /// defined to use a different analyzer will use the one provided here.
    /// </param>
    public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer)
    {
      this.defaultAnalyzer = defaultAnalyzer;
    }
    
    /// <summary> Defines an analyzer to use for the specified field.
    /// 
    /// </summary>
    /// <param name="fieldName">field name requiring a non-default analyzer
    /// </param>
    /// <param name="analyzer">non-default analyzer to use for field
    /// </param>
    public virtual void  AddAnalyzer(System.String fieldName, Analyzer analyzer)
    {
      analyzerMap[fieldName] = analyzer;
    }
    
    public override TokenStream TokenStream(System.String fieldName, System.IO.TextReader reader)
    {
      Analyzer analyzer = (Analyzer) analyzerMap[fieldName];
      if (analyzer == null)
      {
        analyzer = defaultAnalyzer;
      }
      
      return analyzer.TokenStream(fieldName, reader);
    }
    
    public override System.String ToString()
    {
      // {{Aroush-1.9}} 'analyzerMap.ToString()' may return a different value then Java.
      return "PerFieldAnalyzerWrapper(" + analyzerMap.ToString() + ", default=" + defaultAnalyzer + ")";
    }
  }
}
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