uk.ac.starlink.ttools.join

Class Match2Mapping

java.lang.Object

uk.ac.starlink.ttools.join.Match2Mapping

All Implemented Interfaces:

TableMapping

Direct Known Subclasses:

SkyMatch2Mapping

public class Match2Mapping
extends Object
implements TableMapping

TableMapping implementation which does the work of matching two tables.

Since:

2 Nov 2007

Author:

Mark Taylor

Method Summary

Modifier and Type	Method and Description
protected StarTable	makeSubTable(StarTable inTable, String[] exprTuple) Creates a table containing the values which are required by the matcher.
StarTable	mapTables(InputTableSpec[] inSpecs) Perform table mapping.

Methods inherited from class java.lang.Object

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

Method Detail

mapTables

public StarTable mapTables(InputTableSpec[] inSpecs)
                    throws IOException,
                           TaskException

Description copied from interface: TableMapping

Perform table mapping.

Specified by:

mapTables in interface TableMapping

Parameters:

inSpecs - input tables

Returns:

result of processing input tables

Throws:

IOException

TaskException

makeSubTable

protected StarTable makeSubTable(StarTable inTable,
                                 String[] exprTuple)
                          throws ExecutionException

Creates a table containing the values which are required by the matcher. This typically consists of a few of the columns from the input table, but in general may come from any JEL expression based on them. Because JEL compilation is performed here, an exception (rethrown as an ExecutionException) may occur.

Parameters:

inTable - input table

exprTuple - array of JEL expressions giving the values of the tuple elements required for the matcher

Returns:

table containing only a column for each tuple element required for the matcher

Throws:

ExecutionException - if a compilation error occurs