nouveau/src/main/java/org/apache/couchdb/nouveau/lucene9/SimpleAsciiFoldingAnalyzer.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

//
// 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.

package org.apache.couchdb.nouveau.lucene9;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LetterTokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.miscellaneous.ASCIIFoldingFilter;

class SimpleAsciiFoldingAnalyzer extends Analyzer {

    SimpleAsciiFoldingAnalyzer() {}

    @Override
    protected TokenStreamComponents createComponents(String fieldName) {
        Tokenizer tokenizer = new LetterTokenizer();
        return new TokenStreamComponents(tokenizer, new ASCIIFoldingFilter(new LowerCaseFilter(tokenizer)));
    }

    @Override
    protected TokenStream normalize(String fieldName, TokenStream in) {
        return new ASCIIFoldingFilter(new LowerCaseFilter(in));
    }
}