stella.xml

Class SequenceStep

java.lang.Object

stella.xml.SequenceStep

All Implemented Interfaces:

DTDConstants

public class SequenceStep
extends Object
implements DTDConstants

This class represents a single step in a observational sequence. There is always only a single step active during the sequence, i.e. the execution of steps is strictly sequential. A step consists at least of a collection of individual SequenceTasks. Additionally it might define a while condition and a counter name. Tasks define task with arbitrary scheduling amongst each other, they are allowed to run in parallel. When all task within a step are finished, i.e. their complete clauses are met, the step is considered done. If no while loop is specified, the sequence continues with the next step. If a while cluase is specified, it is evaluated at the end of the step, and, if not true, the step is repeated, all task are cleared again. The counter is an internal variable starting with zero on the initial loop and increasing every execution.

Field Summary

Fields

Modifier and Type	Field and Description
private String	loopcounter If a counter name is specified, it is entered here.
private String	loopwhile If a while clause is specified, this is its string representation.
private Collection<SequenceTask>	tasks The collections of task belonging to this step.

Fields inherited from interface stella.xml.DTDConstants

ABORT, ABOVE, ABSTRACT, ABSTRACTPROPOSAL, ADDRESS, BELOW, BLOCK, BROADCAST, BROADCASTWITH, BV, CHAINING, CHANGE, CLASS, COMMAND, COMMANDID, COMMANDINIT, COMMANDLAST, COMMANDPARAMETER, COMMANDREF, COMMENT, COMPLETE, CONDITION, CONSTANT, CONSTANTNAME, CONSTANTVALUE, CONSTRAINT, CONSTRAINTOVERDUE, CONSTRAINTRELAX, DATA, DAUGHTER, DEC, DELAY, DELAYMAX, DELAYTIME, DISABLED, DOCPATH, DURATION, ELAPSED, EMAIL, ENABLED, EPOCH, EQUINOX, EXCEPTION, EXCEPTIONDAUGHTER, EXCEPTIONFOR, EXCEPTIONSUCCESSOR, EXCEPTIONTHIS, FALSE, FIELDOFVIEW, FILE, FITSHEADER, FITSHEADERID, FORMATCLASS, FORMATPATTERN, FROM, GAIN, HISTORY, HISTORYCOMPLETE, HISTORYDB, HISTORYMAX, HISTORYREAD, IGNORE, IMAGETYPE, INIT, INSTITUTION, INSTRUMENT, INTERN, KEY, MAX, MERIT, MIN, NOTIFY, OBJECT, OBJECTID, OBJECTNAME, OBSERVSTART, PICK, PICKMERIT, PICKSUCCESS, PMDEC, PMRA, POSITION, RA, RATE, REC, REQUIRES, RETRY, RETRYMAX, SELECT, SENDING, SEQUENCE, SEQUENCETYPE, SET, SETNAME, SETUP, SETUPID, STEP, STEPCOUNTER, STEPWHILE, SUCCESSOR, TARGET, TARGETACCESS, TARGETDB, TARGETNAME, TARGETNAMEPROPOSAL, TARGETREAD, TARGETSUBMITTED, TARGETTYPE, TASK, TASKDONE, TASKID, TEAM, TIMESLOT, TITLE, TO, TRUE, USER, V, VARIABLE

Constructor Summary

Constructors

Constructor and Description
SequenceStep(Element src) Constructs a new step elements and immediately parses the DOM element provided into all subsequent SequenceTask instances.

Method Summary

Modifier and Type	Method and Description
String	getCounter() Returns the counter name for this step.
Collection<SequenceTask>	getTasks() Returns the collection of all task in this step.
String	getWhile() Returns null, if no while was specified for this step, otherwise the string expression is returned.
private void	parseStep(Element anchor) Parses a single step into the individual sub-task collection, additionally reading a possible looping condition.

Methods inherited from class java.lang.Object

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

Field Detail

tasks

private Collection<SequenceTask> tasks

The collections of task belonging to this step.

loopwhile

private String loopwhile

If a while clause is specified, this is its string representation.

loopcounter

private String loopcounter

If a counter name is specified, it is entered here.

Constructor Detail

SequenceStep

public SequenceStep(Element src)
             throws ParseException

Constructs a new step elements and immediately parses the DOM element provided into all subsequent SequenceTask instances.

Throws:

ParseException

Method Detail

parseStep

private void parseStep(Element anchor)
                throws ParseException

Parses a single step into the individual sub-task collection, additionally reading a possible looping condition.

Throws:

ParseException

getTasks

public Collection<SequenceTask> getTasks()

Returns the collection of all task in this step.

getWhile

public String getWhile()

Returns null, if no while was specified for this step, otherwise the string expression is returned.

getCounter

public String getCounter()

Returns the counter name for this step.