org.abora.gold.id
Class RealStepper

java.lang.Object
  |
  +--org.abora.gold.java.AboraHeaper
        |
        +--org.abora.gold.xpp.basic.Heaper
              |
              +--org.abora.gold.collection.steppers.Stepper
                    |
                    +--org.abora.gold.id.RealStepper

public class RealStepper

extends Stepper

Field Summary

Fields inherited from class org.abora.gold.collection.steppers.Stepper

TheEmptyStepper

Fields inherited from class org.abora.gold.xpp.basic.Heaper

AllBlasts, BecomeMap, GarbageCount, InGC, InitializedClasses, InitializingClasses, LastMemory, NextClientRequestNumber, NotOneElementSignal, PackageTable, PromiseNameTable, StringHashSBoxes

Fields inherited from class org.abora.gold.java.AboraHeaper

ActiveClubs, CurrentAuthor, CurrentBertCanopyCache, CurrentBertCrum, CurrentChunk, CurrentGrandMap, CurrentKeyMaster, CurrentPacker, CurrentSensorCanopyCache, CurrentServer, CurrentSession, CurrentSessions, CurrentTrace, InitialEditClub, InitialOwner, InitialReadClub, InitialSponsor, InsideTransactionFlag

Constructor Summary

RealStepper(PtrArray transitions)

Method Summary

Stepper	copy() Return a new stepper which steps independently of me, but whose current value is the same as mine, and which must produce a future history of values which satisfies the same obligation that my contract obligates me to produce now.
Heaper	fetch() If I am exhausted (i.e., if (!! this->hasValue())), then return NULL.
boolean	hasValue() Iff I have a current value (i.e.
void	step() Essential.

Methods inherited from class org.abora.gold.collection.steppers.Stepper

actualHashForEqual, asArray, atEnd, emptyStepper, forEach, forEachPromise, get, info, initTimeNonInherited, isEqual, itemStepper, linkTimeNonInherited, stepMany, stepMany, theOne

Methods inherited from class org.abora.gold.xpp.basic.Heaper

abstractDeclarationFor, abstractTypeFor, addMethodAttributeToInOf, addPackage, addPackageCategory, allClientProtocolOn, argumentTypesFor, arrow, blast, blast, BLAST, cachePromiseNameTable, cachePromiseNameTableIn, canYouBecome, cast, cleanPromiseClasses, cleanupGarbage, clientClassesDo, clientFunctionsOn, clientMethodsOn, clientProtocol, clientProtocolDo, clientProtocolOn, clientProtocolOn, collectibleClasses, compare, compileClientSubclasses, compileConstantPromiseMethods, compileCreateFromRcvr, compileEQ, compileGeneratedClassMethod, compileGeneratedMethod, compileHook, compilePromise, compilePromiseDefaultMethods, compilePromiseFluidDeclarations, compilePromiseHandlers, compilePromiseMethods, compileRequestCreateMsgInArguments, compileRequestEvaluateMsgInReturningArguments, compileRPCSpecialistEvaluateMsgForReturningArguments, compileSendSelfTo, compileSendSelfToSendHook, compileStubbleMethods, compileSubclassStubbleMethods, computeMangle, computePreorder, constantTypeValue, convert, convertCopyDeclarations, convertDeferredDeclarations, convertProxyDeclarations, convertSubclassCopyDeclarations, convertSubclassDeferredDeclarations, convertSubclassProxyDeclarations, copyReferencesToType, create, create, create, create, create, create, create, create, create, create, createRequestClassArguments, definesProxyMethods, delete, deref, destroy, destruct, destructor, enum, enumFlags, equals, exportName, fetchAttribute, fetchPackage, fetchSuperCategory, fileOutClientProtocol, findCategory, findSenderAndReceiverMethods, findTailInto, flushPromiseNameTable, foo, freezeClientClasses, freezeClientProtocol, freezeStProtocol, frozenClasses, garbageCollect, garbageCollectFrom, gcOpportunity, gcOpportunity, generatedCategory, generatePromiseNames, getCategory, getOrMakePackage, getSuperCategory, handlerSignaturesFrom, hash, hashForEqual, hasProxyMethods, info_clientClasses, info_clientSideClasses, info_promiseClasses, info_stProtocol, inGC, initializedClasses, initializingClasses, initPackages, initStringHashSBoxes, inspectPieces, instanceSize, IntegerVar, isByProxy, isConstructed, isDestructed, isEqual, isEqualOrSubclassOf, isGenerated, isIntType, isKindOf, isRawType, isUnlocked, make, makeClassTable, makeFillTable, makeRequestTable, mangle, markChildren, markCount, markInstances, mayBecome, mayBecomeAnySubclassOf, new1, newX, nonCopyVariables, notWorking, pack, packageClasses, packagingCategory, parseExportName, passe, pointerToStaticMember, pointerToStaticMember, pointerToVirtualMember, preorderMax, preorderNumber, printOn, PROBLEM, problems, promiseClass, promiseDefaultValue, promiseName, promiseNameTable, promiseToAbstract, registerPackageCategory, removeGeneratedCode, removeStubbleMethods, removeSubclassGeneratedCode, removeSubclassStubbleMethods, requestProcedure, requestProceduresFrom, returnTypeFor, rootName, scheduleTermination, sendProxyTo, sendSelfTo, serverNameFor, setGC, signal, signals, smalltalkSelector, stClientProtocol, stubbleSelectorTokenReturnsArguments, subclassNonCopyVariables, takeOop, togglePromiseName, togglePromiseOfParse, unimplemented, unmangle, verifyFreeze, wipeStubble

Methods inherited from class org.abora.gold.java.AboraHeaper

asOop, basicInspect, displayString, error, hack, halt, inspect, knownBug, mightNotImplement, REQUIRES, shouldImplement, shouldNotImplement, stubbleForSubclassResponsibility, thingToDo, willNotImplement

Methods inherited from class java.lang.Object

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

Constructor Detail

RealStepper

public RealStepper(PtrArray transitions)

Method Detail

fetch

public Heaper fetch()

If I am exhausted (i.e., if (!! this->hasValue())), then return NULL. Else return
current element. I return wimpily since most items returned are held by collections.
If I create a new object, I should cache it.

Overrides:

fetch in class Stepper

hasValue

public boolean hasValue()

Iff I have a current value (i.e. this message returns true), then I am not
exhasted. 'fetch' and 'get' will both return this value, and I can be 'step'ped to
my next state. As I am stepped, eventually I may become exhausted (the
reverse of all the above), which is a permanent condition.
Note that not all steppers have to be exhaustable. A Stepper which
enumerates all primes is perfectly reasonable. Assuming otherwise will create
infinite loops. See class comment.

Overrides:

hasValue in class Stepper

step

public void step()

Essential. If I am currently exhausted (see Stepper::hasValue()), then it is an error to
step me. The result of doing so isn't currently specified (we probably should specify it
to BLAST, but I know that the implementation doesn't currently live up to that spec).
If I am not exhausted, then this advances me to my next state. If my current value (see
Stepper::get()) was my final value, then I am now exhausted, otherwise my new current
value is the next value.

Overrides:

step in class Stepper

copy

public Stepper copy()

Return a new stepper which steps independently of me, but whose current
value is the same as mine, and which must produce a future history of values
which satisfies the same obligation that my contract obligates me to produce
now. Typically, this will mean that he must produce the same future history
that I'm going to produce. However, let's say that I am enumerating the
elements of a partial order in some full order which is consistent with the
partial order. If a copy of me is made after I'm part way through, then me
and my copy may produce any future history compatable both with the partial
order and the elements I've already produced by the time of the copy. Of
course, a subclass or a Stepper creating message (like
IntegerRegion::stepper()) may specify the more stringent requirement (that a
copy must produce the same sequence).
To prevent aliasing, Steppers should typically be passed by copy. See class
comment.

Overrides:

copy in class Stepper