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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.indices.analysis;
import org.apache.lucene.analysis.charfilter.HTMLStripCharFilter;
import org.elasticsearch.Version;
import org.elasticsearch.index.analysis.CharFilterFactory;
import org.elasticsearch.indices.analysis.PreBuiltCacheFactory.CachingStrategy;
import java.io.Reader;
import java.util.Locale;
/**
*
*/
public enum PreBuiltCharFilters {
HTML_STRIP(CachingStrategy.ONE) {
@Override
public Reader create(Reader tokenStream, Version version) {
return new HTMLStripCharFilter(tokenStream);
}
};
abstract public Reader create(Reader tokenStream, Version version);
protected final PreBuiltCacheFactory.PreBuiltCache cache;
PreBuiltCharFilters(CachingStrategy cachingStrategy) {
cache = PreBuiltCacheFactory.getCache(cachingStrategy);
}
public synchronized CharFilterFactory getCharFilterFactory(final Version version) {
CharFilterFactory charFilterFactory = cache.get(version);
if (charFilterFactory == null) {
final String finalName = name();
charFilterFactory = new CharFilterFactory() {
@Override
public String name() {
return finalName.toLowerCase(Locale.ROOT);
}
@Override
public Reader create(Reader tokenStream) {
return valueOf(finalName).create(tokenStream, version);
}
};
cache.put(version, charFilterFactory);
}
return charFilterFactory;
}
/**
* Get a pre built CharFilter by its name or fallback to the default one
* @param name CharFilter name
* @param defaultCharFilter default CharFilter if name not found
*/
public static PreBuiltCharFilters getOrDefault(String name, PreBuiltCharFilters defaultCharFilter) {
try {
return valueOf(name.toUpperCase(Locale.ROOT));
} catch (IllegalArgumentException e) {
return defaultCharFilter;
}
}
}