SegmentUtils.java

/*
* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.segment;

import com.google.common.io.Files;
import com.google.common.primitives.Ints;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 */
public class SegmentUtils
{
  public static int getVersionFromDir(File inDir) throws IOException
  {
    File versionFile = new File(inDir, "version.bin");
    if (versionFile.exists()) {
      return Ints.fromByteArray(Files.toByteArray(versionFile));
    }

    final File indexFile = new File(inDir, "index.drd");
    int version;
    try (InputStream in = new FileInputStream(indexFile)) {
      version = in.read();
    }
    return version;
  }
}