org.apache.iotdb.tsfile.read.controller

Class MetadataQuerierByFileImpl

java.lang.Object

org.apache.iotdb.tsfile.read.controller.MetadataQuerierByFileImpl

All Implemented Interfaces:

IMetadataQuerier

public class MetadataQuerierByFileImpl
extends Object
implements IMetadataQuerier

Constructor Summary

Constructors

Constructor and Description
MetadataQuerierByFileImpl(TsFileSequenceReader tsFileReader) Constructor of MetadataQuerierByFileImpl.

Method Summary

Modifier and Type	Method and Description
static TsFileSequenceReader.LocateStatus	checkLocateStatus(IChunkMetadata chunkMetaData, long spacePartitionStartPos, long spacePartitionEndPos) Check the location of a given chunkGroupMetaData with respect to a space partition constraint.
void	clear() clear caches (if used) to release memory.
List<TimeRange>	convertSpace2TimePartition(List<Path> paths, long spacePartitionStartPos, long spacePartitionEndPos) Convert the space partition constraint to the time partition constraint.
List<IChunkMetadata>	getChunkMetaDataList(Path timeseriesPath)
Map<Path,List<IChunkMetadata>>	getChunkMetaDataMap(List<Path> paths)
TSDataType	getDataType(Path path)
TsFileMetadata	getWholeFileMetadata()
void	loadChunkMetaDatas(List<Path> paths) this will load all chunk metadata of given paths into cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

MetadataQuerierByFileImpl

public MetadataQuerierByFileImpl(TsFileSequenceReader tsFileReader)
                          throws IOException

Constructor of MetadataQuerierByFileImpl.

Throws:

IOException

Method Detail

getChunkMetaDataList

public List<IChunkMetadata> getChunkMetaDataList(Path timeseriesPath)
                                          throws IOException

Specified by:

getChunkMetaDataList in interface IMetadataQuerier

Throws:

IOException

getChunkMetaDataMap

public Map<Path,List<IChunkMetadata>> getChunkMetaDataMap(List<Path> paths)
                                                   throws IOException

Specified by:

getChunkMetaDataMap in interface IMetadataQuerier

Throws:

IOException

getWholeFileMetadata

public TsFileMetadata getWholeFileMetadata()

Specified by:

getWholeFileMetadata in interface IMetadataQuerier

loadChunkMetaDatas

public void loadChunkMetaDatas(List<Path> paths)
                        throws IOException

Description copied from interface: IMetadataQuerier

this will load all chunk metadata of given paths into cache.

call this method before calling getChunkMetaDataList() will accelerate the reading of chunk metadata, which will only read TsMetaData once

Specified by:

loadChunkMetaDatas in interface IMetadataQuerier

Throws:

IOException

getDataType

public TSDataType getDataType(Path path)
                       throws IOException

Specified by:

getDataType in interface IMetadataQuerier

Returns:

the corresponding data type.

Throws:

IOException

convertSpace2TimePartition

public List<TimeRange> convertSpace2TimePartition(List<Path> paths,
                                                  long spacePartitionStartPos,
                                                  long spacePartitionEndPos)
                                           throws IOException

Description copied from interface: IMetadataQuerier

Convert the space partition constraint to the time partition constraint.

Specified by:

convertSpace2TimePartition in interface IMetadataQuerier

Parameters:

paths - selected paths in a query expression

spacePartitionStartPos - the start position of the space partition

spacePartitionEndPos - the end position of the space partition

Returns:

the converted time partition constraint

Throws:

IOException

checkLocateStatus

public static TsFileSequenceReader.LocateStatus checkLocateStatus(IChunkMetadata chunkMetaData,
                                                                  long spacePartitionStartPos,
                                                                  long spacePartitionEndPos)

Check the location of a given chunkGroupMetaData with respect to a space partition constraint.

Parameters:

chunkMetaData - the given chunkMetaData

spacePartitionStartPos - the start position of the space partition

spacePartitionEndPos - the end position of the space partition

Returns:

LocateStatus

clear

public void clear()

Description copied from interface: IMetadataQuerier

clear caches (if used) to release memory.

Specified by:

clear in interface IMetadataQuerier