/// <summary>
/// Select explicitly configured record format (via given {@code config}) or format from the store. If store does
/// not exist or has old format (<seealso cref="RecordFormats.generation()"/>) than this method returns
/// <seealso cref="DEFAULT_FORMAT"/>.
/// </summary>
/// <param name="config"> configuration parameters </param>
/// <param name="databaseLayout"> database directory structure </param>
/// <param name="fs"> file system used to access store files </param>
/// <param name="pageCache"> page cache to read store files </param>
/// <returns> record format from the store (if it can be read) or configured record format or <seealso cref="DEFAULT_FORMAT"/> </returns>
/// <seealso cref= RecordFormats#generation() </seealso>
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Nonnull public static RecordFormats selectNewestFormat(org.neo4j.kernel.configuration.Config config, org.neo4j.io.layout.DatabaseLayout databaseLayout, org.neo4j.io.fs.FileSystemAbstraction fs, org.neo4j.io.pagecache.PageCache pageCache, org.neo4j.logging.LogProvider logProvider)
public static RecordFormats SelectNewestFormat(Config config, DatabaseLayout databaseLayout, FileSystemAbstraction fs, PageCache pageCache, LogProvider logProvider)
{
bool formatConfigured = StringUtils.isNotEmpty(ConfiguredRecordFormat(config));
if (formatConfigured)
{
// format was explicitly configured so select it
return(SelectForConfig(config, logProvider));
}
else
{
RecordFormats result = SelectForStore(databaseLayout, fs, pageCache, logProvider);
if (result == null)
{
// format was not explicitly configured and store does not exist, select default format
Info(logProvider, "Selected format '" + _defaultFormat + "' for the new store");
result = _defaultFormat;
}
else if (FormatFamily.IsHigherFamilyFormat(_defaultFormat, result) || (FormatFamily.IsSameFamily(result, _defaultFormat) && (result.Generation() < _defaultFormat.generation())))
{
// format was not explicitly configured and store has lower format
// select default format, upgrade is intended
Info(logProvider, "Selected format '" + _defaultFormat + "' for existing store with format '" + result + "'");
result = _defaultFormat;
}
return(result);
}
}
/// <summary>
/// Finds which format, if any, succeeded the specified format. Only formats in the same family are considered.
/// </summary>
/// <param name="format"> to find successor to. </param>
/// <returns> the format with the lowest generation > format.generation, or None if no such format is known. </returns>
//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Nonnull public static java.util.Optional<RecordFormats> findSuccessor(@Nonnull final RecordFormats format)
//JAVA TO C# CONVERTER WARNING: 'final' parameters are ignored unless the option to convert to C# 7.2 'in' parameters is selected:
public static Optional <RecordFormats> FindSuccessor(RecordFormats format)
{
return(StreamSupport.stream(RecordFormatSelector.AllFormats().spliterator(), false).filter(candidate => FormatFamily.IsSameFamily(format, candidate)).filter(candidate => candidate.generation() > format.Generation()).reduce((a, b) => a.generation() < b.generation() ? a : b));
}
