/**
* 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.
*/
package org.apache.jena.query.text.analyzer ;
import java.io.Reader ;
import org.apache.lucene.analysis.Analyzer ;
import org.apache.lucene.analysis.core.KeywordTokenizer ;
import org.apache.lucene.analysis.core.LowerCaseFilter ;
import org.apache.lucene.util.Version ;
/**
* Lucene Analyzer implementation that works like KeywordAnalyzer (i.e.
* doesn't tokenize the input, keeps it as a single token), but forces text
* to lowercase and is thus case-insensitive.
*/
public class LowerCaseKeywordAnalyzer extends Analyzer {
private Version version;
public LowerCaseKeywordAnalyzer(Version ver) {
this.version = ver;
}
@Override
protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
KeywordTokenizer source = new KeywordTokenizer(reader);
LowerCaseFilter filter = new LowerCaseFilter(version, source);
return new TokenStreamComponents(source, filter);
}
}