uk.ac.starlink.table
Class SelectorStarTable

java.lang.Object
  uk.ac.starlink.table.WrapperStarTable
      uk.ac.starlink.table.SelectorStarTable

All Implemented Interfaces:

StarTable

public abstract class SelectorStarTable
extends WrapperStarTable

Sequential wrapper table which selects only certain rows of its base table. No random access is provided, and the row sequence evaluates the abstract isIncluded(uk.ac.starlink.table.RowSequence) method for each row of the base table as it is iterated over.

Since:

11 Feb 2005

Field Summary

Fields inherited from class uk.ac.starlink.table.WrapperStarTable

baseTable

Constructor Summary

SelectorStarTable(StarTable baseTable)
Constructor.

Method Summary

Object	getCell(int icol)
Object[]	getRow()
long	getRowCount() Returns -1 (length unknown).
RowSequence	getRowSequence() Returns an object which can iterate over all the rows in the table sequentially.
abstract boolean	isIncluded(RowSequence baseSeq) Evaluated to determine whether rows of the base table are included in this one.
boolean	isRandom() Returns false.

Methods inherited from class uk.ac.starlink.table.WrapperStarTable

checkedLongToInt, getBaseTable, getCell, getColumnAuxDataInfos, getColumnCount, getColumnInfo, getName, getParameterByName, getParameters, getRow, getURL, setName, setParameter, setURL, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectorStarTable

public SelectorStarTable(StarTable baseTable)

Constructor.

Parameters:

baseTable - table on which this is based

Method Detail

isIncluded

public abstract boolean isIncluded(RowSequence baseSeq)
                            throws IOException

Evaluated to determine whether rows of the base table are included in this one.

Parameters:

baseSeq - row sequence of the base table

Returns:

true iff the current row of baseSeq is to be included

Throws:

IOException

isRandom

public boolean isRandom()

Returns false.

Specified by:

isRandom in interface StarTable

Overrides:

isRandom in class WrapperStarTable

Returns:

true if table random access methods are available

getRowCount

public long getRowCount()

Returns -1 (length unknown).

Specified by:

getRowCount in interface StarTable

Overrides:

getRowCount in class WrapperStarTable

Returns:

the number of rows, or -1

getRow

public Object[] getRow()

getCell

public Object getCell(int icol)

getRowSequence

public RowSequence getRowSequence()
                           throws IOException

Description copied from interface: StarTable

Returns an object which can iterate over all the rows in the table sequentially.

Specified by:

getRowSequence in interface StarTable

Overrides:

getRowSequence in class WrapperStarTable

Returns:

an object providing sequential access to the table data

Throws:

IOException - if there is an error providing access