org.elasticsearch.index.shard.ShardUtils 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.shard;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.LeafReader;
import org.elasticsearch.common.lucene.index.ElasticsearchDirectoryReader;
import org.elasticsearch.common.lucene.index.ElasticsearchLeafReader;
import org.elasticsearch.core.Nullable;
public final class ShardUtils {
private ShardUtils() {}
/**
* Tries to extract the shard id from a reader if possible, when its not possible,
* will return null.
*/
@Nullable
public static ShardId extractShardId(LeafReader reader) {
final ElasticsearchLeafReader esReader = ElasticsearchLeafReader.getElasticsearchLeafReader(reader);
if (esReader != null) {
assert reader.getRefCount() > 0 : "ElasticsearchLeafReader is already closed";
return esReader.shardId();
}
return null;
}
/**
* Tries to extract the shard id from a reader if possible, when its not possible,
* will return null.
*/
@Nullable
public static ShardId extractShardId(DirectoryReader reader) {
final ElasticsearchDirectoryReader esReader = ElasticsearchDirectoryReader.getElasticsearchDirectoryReader(reader);
if (esReader != null) {
return esReader.shardId();
}
throw new IllegalArgumentException("can't extract shard ID, can't unwrap ElasticsearchDirectoryReader");
}
}