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Class HistoryCrum
invariant: the parent's trace >= the child's trace
The subclasses should differentiate between the number
of children: 0, 1, or more. ORoots have 0 children and
always have a canopyCrum. HCrums for OCrums in the
body of the ent have one child if they are at the top
of an unshared subtreee, and more if they are at the top
of a shared subtree. HCrums with more than one child
almost always have a canopyCrum to represent the join
between the canopies of their multiple hchildren.
The change would make the updateH method return a
new crum, which the oCrums would install.
They don't do so now because I'm not sure if a crum with
no parents can appear in the middle of the ent. If so, then
the version compare operations would gag. Hmmm. The
change doesn't make any difference for that....
Package: Udanax-Gold
All Superclasses: Object Heaper
Immediate Subclasses: HBottomCrum HUpperCrum
Protocols: Object
Categories: Xanadu-Be-Ents
Class Methods
linkTimeNonInherited
nextHistoryCrumSequenceNumber
Shepherds use a sequence number for their hash. Return the next one
and increment. This should actually do spread the hashes.
Instance Methods
actualDelayedStoreBackfollow: finder with: recorder with: hCrumCache
actualDelayedStoreBackfollow: finder with: fossil with: recorder with: hCrumCache
Overridden by: HBottomCrum HUpperCrum
actualHashForEqual
actualStoreBackfollow: finder with: table with: hCrumCache
anyPasses: finder
Overridden by: HBottomCrum HUpperCrum
bertCrum
These objects must have a crum in the bert canopy.
Overridden by: HBottomCrum HUpperCrum
create
Overrides: Heaper
createRcvr: receiver
Overridden by: HBottomCrum HUpperCrum
delayedStoreBackfollow: finder with: recorder with: hCrumCache
delayedStoreBackfollow: finder with: fossil with: recorder with: hCrumCache
displayString
Overrides: Object
hCrums
hCut
Overridden by: HBottomCrum HUpperCrum
inspect
Overrides: Object
inspectCanopy
inspectMenuArray
inspectOrgls
Overridden by: HBottomCrum HUpperCrum
inTrace: trace
Return true if the receiver can backfollow to trace.
Overridden by: HBottomCrum HUpperCrum
isEmpty
Return true if their are no upward pointers. This is used
by OParts to determine if they can be forgotten.
Overridden by: HBottomCrum HUpperCrum
isEqual: other
mappingTo: trace with: initial
return the mapping into the domain space of the given trace
Overridden by: HBottomCrum HUpperCrum
oParents
Overridden by: HBottomCrum HUpperCrum
printOn: aStream
Overrides: Object
Overridden by: HBottomCrum
propagateBCrum: newBCrum
If bertCrum is leafward of newBCrum then change it and return true,
otherwise return false.
Overridden by: HBottomCrum HUpperCrum
ringDetectors: edition
Ring all the detectors north of me with the given Edition as argument
Overridden by: HBottomCrum HUpperCrum
sendSelfTo: xmtr
Overridden by: HBottomCrum HUpperCrum
showOn: oo
storeBackfollow: finder with: table with: hCrumCache
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