Package org.apache.druid.segment

Class SegmentUtils

java.lang.Object

org.apache.druid.segment.SegmentUtils

public class SegmentUtils
extends Object

Utility methods useful for implementing deep storage extensions.

Method Summary

Modifier and Type	Method	Description
static Object	commaSeparatedIdentifiers(Collection<DataSegment> segments)	Returns an object whose toString() returns a String with identifiers of the given segments, comma-separated.
static int	getVersionFromDir(File inDir)
static Map<org.joda.time.Interval,List<DataSegment>>	groupSegmentsByInterval(Collection<DataSegment> segments)
static String	hashIds(List<DataSegment> segments)	Hash the IDs of the given segments based on SHA-256 algorithm.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

hashIds

public static String hashIds(List<DataSegment> segments)

Hash the IDs of the given segments based on SHA-256 algorithm.

getVersionFromDir

public static int getVersionFromDir(File inDir)
                             throws IOException

Throws:

IOException

commaSeparatedIdentifiers

@Nullable
public static Object commaSeparatedIdentifiers(@Nullable
                                               Collection<DataSegment> segments)

Returns an object whose toString() returns a String with identifiers of the given segments, comma-separated. Useful for log messages. Not useful for anything else, because this doesn't take special effort to escape commas that occur in identifiers (not common, but could potentially occur in a datasource name).

groupSegmentsByInterval

public static Map<org.joda.time.Interval,List<DataSegment>> groupSegmentsByInterval(Collection<DataSegment> segments)