edu.mit.ai.psg.traveler
Class ActivityRecordMethods.IteratorBase

java.lang.Object
  |
  +--edu.mit.ai.psg.traveler.ActivityRecordMethods.IteratorBase

Direct Known Subclasses:

ActivityRecordMethods.BiographyIterator, ActivityRecordMethods.SuperactivityIterator, ActivityRecordMethods.ThreadIterator

Enclosing class:

ActivityRecordMethods

public abstract static class ActivityRecordMethods.IteratorBase

extends Object

implements ActivityRecordMethods.Iterator

Abstract base class for ActivityRecord iterators; derived classes add method to computeNext()

Field Summary

protected boolean	isAtEntrance isAtEntrance is true if the activity to be returned next will be returned for its entrance.
protected ActivityRecord	record
protected boolean	recordIsNext true if record holds next record to return; otherwise record holds last record returned, and computeNext() will be called to compute the next record from the last record and set record to it.

Constructor Summary

ActivityRecordMethods.IteratorBase(ActivityRecord startRecord, boolean atEntrance, boolean startRecordIsFirst)

Method Summary

protected abstract void	computeNext() method called by hasNext() and next() to compute the next activity record if the current record has already been returned
boolean	hasNext()
boolean	isAtEntrance() for iterators that return each activity twice, once for when the thread entered the activity, and once for when it exited.
Object	next()
void	remove()

Methods inherited from class java.lang.Object

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

Field Detail

record

protected ActivityRecord record

recordIsNext

protected boolean recordIsNext

true if record holds next record to return; otherwise record holds last record returned, and computeNext() will be called to compute the next record from the last record and set record to it.

isAtEntrance

protected boolean isAtEntrance

isAtEntrance is true if the activity to be returned next will be returned for its entrance.

Constructor Detail

ActivityRecordMethods.IteratorBase

public ActivityRecordMethods.IteratorBase(ActivityRecord startRecord,
                                          boolean atEntrance,
                                          boolean startRecordIsFirst)

Method Detail

hasNext

public boolean hasNext()

next

public Object next()

computeNext

protected abstract void computeNext()

method called by hasNext() and next() to compute the next activity record if the current record has already been returned

remove

public void remove()

Throws:

UnsupportedOperationException -

isAtEntrance

public boolean isAtEntrance()

Description copied from interface: ActivityRecordMethods.Iterator

for iterators that return each activity twice, once for when the thread entered the activity, and once for when it exited. isAtEntrance returns true if the activity to be returned next will be returned for its entrance.

Specified by:

isAtEntrance in interface ActivityRecordMethods.Iterator

Tags copied from interface: ActivityRecordMethods.Iterator

Throws:

NoSuchElementException - if there are no more activities