edu.umn.cs.spatialHadoop.temporal

Class TemporalIndex

java.lang.Object

edu.umn.cs.spatialHadoop.temporal.TemporalIndex

public class TemporalIndex
extends java.lang.Object

Stores and retrieves a temporal index which partitions data into disjoint temporal partitions each stored in a separate directory.

Author:

Ahmed Eldawy

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TemporalIndex.TemporalPartition Stores the information of one partition in the temporal index.

Constructor Summary

Constructors

Constructor and Description
TemporalIndex(FileSystem fs, Path path) Constructs a temporal index on the fly given a directory that follows a standard naming convention for subdirectories.

Method Summary

Methods

Modifier and Type	Method and Description
TemporalIndex.TemporalPartition[]	selectContained(long start, long end) Select all partitions that are totally contained in a given time range
TemporalIndex.TemporalPartition[]	selectOverlap(long start, long end) Select all partitions that overlap a temporal query range given as start and end times.

Methods inherited from class java.lang.Object

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

Constructor Detail

TemporalIndex

public TemporalIndex(FileSystem fs,
             Path path)
              throws java.io.IOException,
                     java.text.ParseException

Constructs a temporal index on the fly given a directory that follows a standard naming convention for subdirectories. For a partitions which spans a whole day, the name is 'yyyy.mm.dd'. For a partitions which spans a whole month, the name is 'yyyy.mm'. For a partitions which spans a whole year, the name is 'yyyy'.

Parameters:

path -

Throws:

java.io.IOException

java.text.ParseException

Method Detail

selectOverlap

public TemporalIndex.TemporalPartition[] selectOverlap(long start,
                                              long end)

Select all partitions that overlap a temporal query range given as start and end times.

Parameters:

start -

end -

Returns:

selectContained

public TemporalIndex.TemporalPartition[] selectContained(long start,
                                                long end)

Select all partitions that are totally contained in a given time range

Parameters:

start -

end -

Returns:

- All matching partitions or null if non are matched