/*
* 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.translog;
import org.elasticsearch.common.io.stream.InputStreamStreamInput;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.channels.FileChannel;
/**
* Version 0 of the translog format, there is no header in this file
*/
public class LegacyTranslogStream implements TranslogStream {
LegacyTranslogStream() {
}
@Override
public Translog.Operation read(StreamInput in) throws IOException {
Translog.Operation.Type type = Translog.Operation.Type.fromId(in.readByte());
Translog.Operation operation = TranslogStreams.newOperationFromType(type);
operation.readFrom(in);
return operation;
}
@Override
public void write(StreamOutput out, Translog.Operation op) throws IOException {
out.writeByte(op.opType().id());
op.writeTo(out);
}
@Override
public int writeHeader(FileChannel channel) {
// nothing, there is no header for version 0 translog files
return 0;
}
@Override
public StreamInput openInput(File translogFile) throws FileNotFoundException {
// nothing to do, legacy translogs have no header
return new InputStreamStreamInput(new FileInputStream(translogFile));
}
}