content: /*
   * Copyright 2014-2025 Real Logic Limited.
   *
   * Licensed 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
   *
   * https://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.aeron.archive;
  
  import org.agrona.LangUtil;
  import org.agrona.SemanticVersion;
  
  import java.io.File;
  import java.nio.channels.FileChannel;
  
  import static java.nio.file.StandardOpenOption.*;
  
  final class MigrationUtils
  {
      private static final String MIGRATION_TIMESTAMP_FILE_PREFIX = "migration-";
      private static final String MIGRATION_TIMESTAMP_FILE_SUFFIX = ".dat";
  
      private MigrationUtils()
      {
      }
  
      static FileChannel createMigrationTimestampFile(
          final File directory, final int fromVersion, final int toVersion)
      {
          final String filename = migrationTimestampFileName(fromVersion, toVersion);
          final File timestampFile = new File(directory, filename);
  
          FileChannel fileChannel = null;
  
          try
          {
              fileChannel = FileChannel.open(timestampFile.toPath(), CREATE_NEW, READ, WRITE, SPARSE);
              fileChannel.force(true);
          }
          catch (final Exception ex)
          {
              System.err.println("Could not create migration timestamp file:" + timestampFile);
              LangUtil.rethrowUnchecked(ex);
          }
  
          return fileChannel;
      }
  
      static String migrationTimestampFileName(final int fromVersion, final int toVersion)
      {
          return MIGRATION_TIMESTAMP_FILE_PREFIX + fromVersion + "-to-" + toVersion + MIGRATION_TIMESTAMP_FILE_SUFFIX;
      }
  
      static String fullVersionString(final int version)
      {
          return version +
              "(Major " + SemanticVersion.major(version) +
              " Minor " + SemanticVersion.minor(version) +
              " Patch " + SemanticVersion.patch(version) + ")";
      }
  }
  