A default implementation of
DataChannelDescriptorMerger. The general rule of
merge is that the order of descriptors on the merge list matters. If there are two
conflicting metadata objects belonging to two descriptors, an object from the last
descriptor takes precedence over the object from the first one. This way it is easy to
override pieces of metadata. This is also similar to how DI modules are merged in
Cayenne. So this is how the merge works:
- Merged descriptor name is the same as the name of the last descriptor on the merge
list.
- Merged descriptor properties are the same as the properties of the last descriptor
on the merge list. I.e. properties are not merged to avoid invalid combinations and
unexpected runtime behavior.
- If there are two or more DataMaps with the same name, only one DataMap is placed in
the merged descriptor, the rest are discarded. DataMap with highest index in the
descriptor array is chosen per precedence rule above.
- If there are two or more DataNodes with the same name, only one DataNodes is placed
in the merged descriptor, the rest are discarded. DataNodes with highest index in the
descriptor array is chosen per precedence rule above.