Package org.apache.druid.segment

Class RowBasedSegment<RowType>

java.lang.Object

org.apache.druid.segment.RowBasedSegment<RowType>

All Implemented Interfaces:

Closeable, AutoCloseable, Segment

Direct Known Subclasses:

LookupSegment

public class RowBasedSegment<RowType>
extends Object
implements Segment

A Segment that is based on a stream of objects.

Constructor Summary

Constructors

Constructor	Description
RowBasedSegment(SegmentId segmentId, Sequence<RowType> rowSequence, RowAdapter<RowType> rowAdapter, RowSignature rowSignature)	Create a row-based segment.

Method Summary

Modifier and Type	Method	Description
QueryableIndex	asQueryableIndex()
StorageAdapter	asStorageAdapter()
void	close()
org.joda.time.Interval	getDataInterval()
SegmentId	getId()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.segment.Segment

as, asString

Constructor Detail

RowBasedSegment

public RowBasedSegment(SegmentId segmentId,
                       Sequence<RowType> rowSequence,
                       RowAdapter<RowType> rowAdapter,
                       RowSignature rowSignature)

Create a row-based segment. The provided "rowIterable" must be in time-order according to the provided RowAdapter.timestampFunction(). The cursor returned by RowBasedStorageAdapter.makeCursors(org.apache.druid.query.filter.Filter, org.joda.time.Interval, org.apache.druid.segment.VirtualColumns, org.apache.druid.java.util.common.granularity.Granularity, boolean, org.apache.druid.query.QueryMetrics<?>) makes no attempt to verify this, and callers will expect it. The provided "rowSignature" will be used for reporting available columns and their capabilities to users of asStorageAdapter(). Note that the ColumnSelectorFactory implementation returned by this segment's storage adapter will allow creation of selectors on any field, using the RowAdapter.columnFunction(java.lang.String) for that field, even if it doesn't appear in "rowSignature".

Parameters:

segmentId - segment identifier; will be returned by getId()

rowSequence - objects that comprise this segment. Must be re-iterable if support for Cursor.reset() is required. Otherwise, does not need to be re-iterable.

rowAdapter - adapter used for reading these objects

rowSignature - signature of the columns in these objects

Method Detail

getId

@Nonnull
public SegmentId getId()

Specified by:

getId in interface Segment

getDataInterval

@Nonnull
public org.joda.time.Interval getDataInterval()

Specified by:

getDataInterval in interface Segment

asQueryableIndex

@Nullable
public QueryableIndex asQueryableIndex()

Specified by:

asQueryableIndex in interface Segment

asStorageAdapter

@Nonnull
public StorageAdapter asStorageAdapter()

Specified by:

asStorageAdapter in interface Segment

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable