In ch.qos.logback.core.joran.util.PropertySetter

public AggregationType computeAggregationType(String name) {
String cName = capitalizeFirstLetter(name);

Method addMethod = findAdderMethod(cName);

// if the
if (addMethod != null) {
AggregationType type = computeRawAggregationType(addMethod);
switch (type)

{ case NOT_FOUND: return AggregationType.NOT_FOUND; case AS_BASIC_PROPERTY: return AggregationType.AS_BASIC_PROPERTY_COLLECTION; case AS_COMPLEX_PROPERTY: return AggregationType.AS_COMPLEX_PROPERTY_COLLECTION; }

}

Method setterMethod = findSetterMethod(name);
if (setterMethod != null)

{ return computeRawAggregationType(setterMethod); }

else

{ // we have failed return AggregationType.NOT_FOUND; }

}

The Aggregation types

AS_BASIC_PROPERTY_COLLECTION, // a collection of basic attributes
AS_COMPLEX_PROPERTY_COLLECTION; // a collection of complex attributes

are not covered.

If they cannot occur, suggesting

case AS_BASIC_PROPERTY_COLLECTION:
throw new Error("Cannot happen");
case AS_COMPLEX_PROPERTY_COLLECTION:
throw new Error("Cannot happen");

to placate fussy compilers.