/*
* 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.shard;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.LeafReader;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.lucene.index.ElasticsearchDirectoryReader;
import org.elasticsearch.common.lucene.index.ElasticsearchLeafReader;
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");
}
}