Deduplication.py

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# Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
#
# Functions used by the ComponentAccumulator to de-duplicate components.
#
 
from AthenaConfiguration.DebuggingContext import raiseWithCurrentContext
 
class DeduplicationFailed(RuntimeError):
    pass
 
 
def deduplicate(newComp, compList):
    """Merge newComp with compList. If a matching component is found it is updated
    in compList. Otherwise a new component is added to compList.
 
    Returns True if a new component has been added, otherwise False. If merging fails,
    an exception is raised.
    """
 
    for idx, comp in enumerate(compList):
        if comp.__cpp_type__==newComp.__cpp_type__ and comp.name==newComp.name:
            exception = None
            try:
                newComp.merge(comp)
            except Exception as e:
                exception = e  # remember exception and raise again outside the handler
            if exception:
                raiseWithCurrentContext(exception)
 
            # We found a service of the same type and name and could reconcile the two instances.
            # Overwrite the component in the list with the new (merged) component.
            compList[idx] = newComp
            return False
 
    # No component of the same type and name found, simply append
    compList.append(newComp)
    return True
 
 
def deduplicateOne(newComp, oldComp):
    """Merge newComp with oldComp and provide diagnostics on failure."""
 
    exception = None
    try:
        assert oldComp.__cpp_type__ == newComp.__cpp_type__, "Deduplicating components of different type"
        assert oldComp.name == newComp.name, "Deduplicating components of different name"
        oldComp.merge(newComp)
    except Exception as e:
        exception = e  # remember exception and raise again outside the handler
    if exception:
        raiseWithCurrentContext(exception)