Use the mapping strategy to define basic mapping behavior for null values.
The following options are available for mapping strategy:
MAP_ALL - A strategy that maps all values of a field.
MAP_NOT_NULL - A strategy that maps only the values of a field that are not null. If the field value is null it will not override the current value in the target class instance. This is the default strategy when creating a new ShapeShift instance.
There are two options for setting the mapping strategy:
Default Mapping Strategy
Settings the default mapping strategy for the ShapeShift instance.