package org.apache.lucene.analysis.ja;
/*
* 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.
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.util.Locale;
import java.util.Map;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.ja.JapaneseTokenizer;
import org.apache.lucene.analysis.ja.JapaneseTokenizer.Mode;
import org.apache.lucene.analysis.ja.dict.UserDictionary;
import org.apache.lucene.analysis.util.TokenizerFactory;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.analysis.util.ResourceLoader;
import org.apache.lucene.analysis.util.ResourceLoaderAware;
/**
* Factory for {@link org.apache.lucene.analysis.ja.JapaneseTokenizer}.
* <pre class="prettyprint">
* <fieldType name="text_ja" class="solr.TextField">
* <analyzer>
* <tokenizer class="solr.JapaneseTokenizerFactory"
* mode="NORMAL"
* userDictionary="user.txt"
* userDictionaryEncoding="UTF-8"
* discardPunctuation="true"
* />
* <filter class="solr.JapaneseBaseFormFilterFactory"/>
* </analyzer>
* </fieldType>
* </pre>
*/
public class JapaneseTokenizerFactory extends TokenizerFactory implements ResourceLoaderAware {
private static final String MODE = "mode";
private static final String USER_DICT_PATH = "userDictionary";
private static final String USER_DICT_ENCODING = "userDictionaryEncoding";
private static final String DISCARD_PUNCTUATION = "discardPunctuation"; // Expert option
private UserDictionary userDictionary;
private Mode mode;
private boolean discardPunctuation;
@Override
public void inform(ResourceLoader loader) throws IOException {
mode = getMode(args);
String userDictionaryPath = args.get(USER_DICT_PATH);
if (userDictionaryPath != null) {
InputStream stream = loader.openResource(userDictionaryPath);
String encoding = args.get(USER_DICT_ENCODING);
if (encoding == null) {
encoding = IOUtils.UTF_8;
}
CharsetDecoder decoder = Charset.forName(encoding).newDecoder()
.onMalformedInput(CodingErrorAction.REPORT)
.onUnmappableCharacter(CodingErrorAction.REPORT);
Reader reader = new InputStreamReader(stream, decoder);
userDictionary = new UserDictionary(reader);
} else {
userDictionary = null;
}
discardPunctuation = getBoolean(DISCARD_PUNCTUATION, true);
}
@Override
public Tokenizer create(Reader input) {
return new JapaneseTokenizer(input, userDictionary, discardPunctuation, mode);
}
private Mode getMode(Map<String, String> args) {
String mode = args.get(MODE);
if (mode != null) {
return Mode.valueOf(mode.toUpperCase(Locale.ROOT));
} else {
return JapaneseTokenizer.DEFAULT_MODE;
}
}
}