org.elasticsearch.repositories.blobstore.LegacyBlobStoreFormat Maven / Gradle / Ivy
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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.repositories.blobstore;
import org.elasticsearch.common.ParseFieldMatcher;
import org.elasticsearch.common.blobstore.BlobContainer;
import org.elasticsearch.common.io.Streams;
import org.elasticsearch.common.io.stream.BytesStreamOutput;
import org.elasticsearch.common.xcontent.FromXContentBuilder;
import org.elasticsearch.common.xcontent.ToXContent;
import java.io.IOException;
import java.io.InputStream;
/**
* Snapshot metadata file format used before v2.0
*/
public class LegacyBlobStoreFormat extends BlobStoreFormat {
/**
* @param blobNameFormat format of the blobname in {@link String#format} format
* @param reader the prototype object that can deserialize objects with type T
*/
public LegacyBlobStoreFormat(String blobNameFormat, FromXContentBuilder reader, ParseFieldMatcher parseFieldMatcher) {
super(blobNameFormat, reader, parseFieldMatcher);
}
/**
* Reads and parses the blob with given name.
*
* If required the checksum of the blob will be verified.
*
* @param blobContainer blob container
* @param blobName blob name
* @return parsed blob object
*/
public T readBlob(BlobContainer blobContainer, String blobName) throws IOException {
try (InputStream inputStream = blobContainer.readBlob(blobName)) {
BytesStreamOutput out = new BytesStreamOutput();
Streams.copy(inputStream, out);
return read(out.bytes());
}
}
}