package org.apache.lucene.analysis;
/**
* 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.
*/
import java.io.Reader;
import java.util.Map;
import java.util.HashMap;
/**
* 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 extends Analyzer {
private Analyzer defaultAnalyzer;
private Map analyzerMap = new HashMap();
/**
* Constructs with default analyzer.
*
* @param defaultAnalyzer 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.
*
* @param fieldName field name requiring a non-default analyzer.
* @param analyzer non-default analyzer to use for field
*/
public void addAnalyzer(String fieldName, Analyzer analyzer) {
analyzerMap.put(fieldName, analyzer);
}
public TokenStream tokenStream(String fieldName, Reader reader) {
Analyzer analyzer = (Analyzer) analyzerMap.get(fieldName);
if (analyzer == null) {
analyzer = defaultAnalyzer;
}
return analyzer.tokenStream(fieldName, reader);
}
}
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