def __init__(self, branch: TreeBase = None, relParent=None, mode=Mode.Uid):
self.mode = mode
self.uid = branch.uid
relParent = relParent or branch.root
try:
self.address = branch.relAddress(fromBranch=relParent)
except:
self.address = []
def addChild(self,
branch: TreeBase,
index=None,
force=False,
emitDelta=None) -> TreeBase:
"""check if a delta is necessary"""
#print("addChild")
emitDelta = emitDelta if emitDelta is not None else self.trackingDeltas
#print("emitStackDelta", emitStackDelta, self.trackingDeltas)
if emitDelta:
# check if tree is "known" to this delta tracking scope
try:
relPath = branch.relAddress(fromBranch=self.deltaTrackingRoot)
print("existing branch delta")
structDelta = TreeStructureDelta(
branchRef=TreeReference(branch,
relParent=self.deltaTrackingRoot),
oldParentRef=TreeReference(
branch.parent, relParent=self.deltaTrackingRoot),
parentRef=TreeReference(
branch=self,
relParent=self.deltaTrackingRoot,
),
oldIndex=branch.index(),
newIndex=index or -1,
eventCode=self.StructureEvents.branchAdded)
self.emitStackDelta(structDelta)
except LookupError:
print("new branch delta")
# branch not known to delta root, make creation delta
createDelta = TreeCreationDelta(
TreeReference(branch,
relParent=None,
mode=TreeReference.Mode.Uid),
parentRef=TreeReference(self,
relParent=self.deltaTrackingRoot),
name=branch.name,
value=branch.value,
index=index or -1,
treeUid=branch.uid,
treeCls=Tree)
self.emitStackDelta(createDelta)
# print("readonly", self.readOnly)
if self.readOnly:
print("read only returning")
return None
# check for read only
if self.readOnly:
raise PermissionError(
f"tree {self.address()} is read only, cannot set value")
return super(Tree, self).addChild(branch, index=index)