org.elasticsearch.index.codec.CodecService Maven / Gradle / Ivy
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index.codec;
import org.apache.lucene.codecs.Codec;
import org.apache.lucene.codecs.lucene87.Lucene87Codec;
import org.apache.lucene.codecs.lucene87.Lucene87Codec.Mode;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.core.Nullable;
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 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) {
final MapBuilder codecs = MapBuilder.newMapBuilder();
if (mapperService == null) {
codecs.put(DEFAULT_CODEC, new Lucene87Codec());
codecs.put(BEST_COMPRESSION_CODEC, new Lucene87Codec(Mode.BEST_COMPRESSION));
} else {
codecs.put(DEFAULT_CODEC, new PerFieldMappingPostingFormatCodec(Mode.BEST_SPEED, mapperService));
codecs.put(BEST_COMPRESSION_CODEC, new PerFieldMappingPostingFormatCodec(Mode.BEST_COMPRESSION, mapperService));
}
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]);
}
}