uk.ac.starlink.topcat.plot2
Class TableCloud

java.lang.Object
  uk.ac.starlink.topcat.plot2.TableCloud

public abstract class TableCloud
extends Object

Point cloud representation for coordinates in a single table. A TableCloud may aggregate SubClouds which are the same except that they may represent different row subsets (row masks). Each reference to a given point (a given table row) will only appear in a TableCloud once. When iterating over the points, no guarantee is given about the order in which they appear.

Since:

27 Jan 2014

Author:

Mark Taylor

Constructor Summary

protected

TableCloud(uk.ac.starlink.ttools.plot2.DataGeom geom, TopcatModel tcModel, int iPosCoord) Constructor.

Method Summary

static TableCloud[]	createTableClouds(uk.ac.starlink.ttools.plot2.SubCloud[] subClouds) Returns a list of TableClouds from a given list of SubClouds.
abstract uk.ac.starlink.ttools.plot2.data.TupleSequence	createTupleSequence(uk.ac.starlink.ttools.plot2.data.DataStore dataStore) Returns a sequence of tuples that will iterate over this cloud's points.
uk.ac.starlink.ttools.plot2.DataGeom	getDataGeom() Returns this point cloud's data geom.
int	getPosCoordIndex() Returns the position in tuples at which position coordinates are found.
abstract long	getReadRowCount() Returns the number of times that read will be called on the dataStore for created tuple sequences.
TopcatModel	getTopcatModel() Returns the table in which this point cloud's points are found.

Methods inherited from class java.lang.Object

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

Constructor Detail

TableCloud

protected TableCloud(uk.ac.starlink.ttools.plot2.DataGeom geom,
                     TopcatModel tcModel,
                     int iPosCoord)

Constructor.

Parameters:

geom - converts coords to data positions

tcModel - table in which these points occur

iPosCoord - start position in tuple for position coordinates

Method Detail

getDataGeom

public uk.ac.starlink.ttools.plot2.DataGeom getDataGeom()

Returns this point cloud's data geom.

Returns:

data geom

getTopcatModel

public TopcatModel getTopcatModel()

Returns the table in which this point cloud's points are found.

Returns:

data source

getPosCoordIndex

public int getPosCoordIndex()

Returns the position in tuples at which position coordinates are found.

Returns:

position coord index

getReadRowCount

public abstract long getReadRowCount()

Returns the number of times that read will be called on the dataStore for created tuple sequences. This is used for progress updates. Note it is not (necessarily) the number of tuples in created tuple sequences.

Returns:

total number of calls to base dataStore tupleSequence.next() generated by the result of createTupleSequence

createTupleSequence

public abstract uk.ac.starlink.ttools.plot2.data.TupleSequence createTupleSequence(uk.ac.starlink.ttools.plot2.data.DataStore dataStore)

Returns a sequence of tuples that will iterate over this cloud's points.

Parameters:

dataStore - data storage

Returns:

iterator over data tuples

createTableClouds

public static TableCloud[] createTableClouds(uk.ac.starlink.ttools.plot2.SubCloud[] subClouds)

Returns a list of TableClouds from a given list of SubClouds. This collects together subclouds corresponding to each set of position coordinates. The returned array taken together will contain each included position only once (the union of included subsets).

Parameters:

subClouds - point clouds by subset

Returns:

aggregated point clouds