Package org.elasticsearch.index.translog

Source Code of org.elasticsearch.index.translog.LegacyTranslogStream

/*
* 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));
    }

}
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