uk.ac.starlink.ttools.task

Class JoinMapper

java.lang.Object

uk.ac.starlink.ttools.task.JoinMapper

All Implemented Interfaces:

TableMapper

public class JoinMapper
extends Object
implements TableMapper

TableMapper which joins tables side-by-side. Rows are not rearranged.

Since:

28 Nov 2006

Author:

Mark Taylor

Constructor Summary

Constructors

Constructor and Description
JoinMapper() Constructor.

Method Summary

Modifier and Type	Method and Description
TableMapping	createMapping(Environment env, int nin) Creates a new mapping object, using a given execution environment for any additional required state.
Parameter<?>[]	getParameters() Returns the parameters defined by this mapper.

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinMapper

public JoinMapper()

Constructor.

Method Detail

getParameters

public Parameter<?>[] getParameters()

Description copied from interface: TableMapper

Returns the parameters defined by this mapper.

Specified by:

getParameters in interface TableMapper

Returns:

parameter array

createMapping

public TableMapping createMapping(Environment env,
                                  int nin)
                           throws TaskException

Description copied from interface: TableMapper

Creates a new mapping object, using a given execution environment for any additional required state.

Specified by:

createMapping in interface TableMapper

Parameters:

env - execution environment

nin - number of input tables that the mapping will operate on if known; -1 if not

Throws:

TaskException