uk.ac.starlink.ttools.cone
Class SkyConeMatch2

java.lang.Object
  uk.ac.starlink.ttools.task.ConsumerTask
      uk.ac.starlink.ttools.task.SingleMapperTask
          uk.ac.starlink.ttools.cone.SkyConeMatch2

All Implemented Interfaces:

uk.ac.starlink.task.Task

Direct Known Subclasses:

MultiCone, SqlCone

public abstract class SkyConeMatch2
extends SingleMapperTask

Crossmatcher which works by performing one cone-search type query for each row of an input table on an external service of some kind. This is not prima facie a very efficient way of doing a cross match, but if the external service represents a table which is too large or otherwise unfeasible to access as one term in a normal cone search it's about the only way to do it.

Since:

9 Aug 2007

Author:

Mark Taylor

Constructor Summary

SkyConeMatch2(String purpose, Coner coner, int maxParallel)
Constructor.

Method Summary

TableProducer

createProducer(uk.ac.starlink.task.Environment env) Returns an object which can produce the effective output table which will be consumed by this task.

Methods inherited from class uk.ac.starlink.ttools.task.SingleMapperTask

createInputProducer

Methods inherited from class uk.ac.starlink.ttools.task.ConsumerTask

createExecutable, createProducer, getOutputMode, getParameterList, getParameters, getPurpose

Methods inherited from class java.lang.Object

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

Constructor Detail

SkyConeMatch2

public SkyConeMatch2(String purpose,
                     Coner coner,
                     int maxParallel)

Constructor.

Parameters:

purpose - one-line description of the purpose of the task

coner - object which provides the sky cone search service

maxParallel - the largest number of parallel threads which will be permitted for multi-threaded operation; 1 means single-threaded only, and <=0 means no limit - use with care!

Method Detail

createProducer

public TableProducer createProducer(uk.ac.starlink.task.Environment env)
                             throws uk.ac.starlink.task.TaskException

Description copied from class: ConsumerTask

Returns an object which can produce the effective output table which will be consumed by this task.

Specified by:

createProducer in class ConsumerTask

Parameters:

env - execution environment

Returns:

table producer

Throws:

uk.ac.starlink.task.TaskException