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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.index.codec;
import org.apache.lucene.codecs.Codec;
import org.apache.lucene.codecs.lucene50.Lucene50StoredFieldsFormat.Mode;
import org.apache.lucene.codecs.lucene54.Lucene54Codec;
import org.apache.lucene.codecs.lucene60.Lucene60Codec;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.common.logging.ESLogger;
import org.elasticsearch.index.mapper.MapperService;
import java.util.Map;
/**
* Since Lucene 4.0 low level index segments are read and written through a
* codec layer that allows to use use-case specific file formats &
* data-structures per field. Elasticsearch exposes the full
* {@link Codec} capabilities through this {@link CodecService}.
*/
public class CodecService {
private final Map<String, Codec> codecs;
public static final String DEFAULT_CODEC = "default";
public static final String BEST_COMPRESSION_CODEC = "best_compression";
/** the raw unfiltered lucene default. useful for testing */
public static final String LUCENE_DEFAULT_CODEC = "lucene_default";
public CodecService(@Nullable MapperService mapperService, ESLogger logger) {
final MapBuilder<String, Codec> codecs = MapBuilder.<String, Codec>newMapBuilder();
if (mapperService == null) {
codecs.put(DEFAULT_CODEC, new Lucene60Codec());
codecs.put(BEST_COMPRESSION_CODEC, new Lucene60Codec(Mode.BEST_COMPRESSION));
} else {
codecs.put(DEFAULT_CODEC,
new PerFieldMappingPostingFormatCodec(Mode.BEST_SPEED, mapperService, logger));
codecs.put(BEST_COMPRESSION_CODEC,
new PerFieldMappingPostingFormatCodec(Mode.BEST_COMPRESSION, mapperService, logger));
}
codecs.put(LUCENE_DEFAULT_CODEC, Codec.getDefault());
for (String codec : Codec.availableCodecs()) {
codecs.put(codec, Codec.forName(codec));
}
this.codecs = codecs.immutableMap();
}
public Codec codec(String name) {
Codec codec = codecs.get(name);
if (codec == null) {
throw new IllegalArgumentException("failed to find codec [" + name + "]");
}
return codec;
}
/**
* Returns all registered available codec names
*/
public String[] availableCodecs() {
return codecs.keySet().toArray(new String[0]);
}
}
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