/*
* 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
{
/// 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.
/// See TestPerFieldAnalyzerWrapper.java for example usage.
///
public class PerFieldAnalyzerWrapper:Analyzer
{
private Analyzer defaultAnalyzer;
private System.Collections.IDictionary analyzerMap = new System.Collections.Hashtable();
/// Constructs with default analyzer.
///
///
/// Any fields not specifically
/// defined to use a different analyzer will use the one provided here.
///
public PerFieldAnalyzerWrapper(Analyzer defaultAnalyzer)
{
this.defaultAnalyzer = defaultAnalyzer;
}
/// Defines an analyzer to use for the specified Field.
///
///
/// Field name requiring a non-default analyzer.
///
/// non-default analyzer to use for Field
///
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);
}
}
}