Reference factor value provider

The reference factor value provider:

• Is implemented in the ReferenceFactorValueProvider class.
• Retrieves all distinct values used in a column of a rate table (source rate table).
• Must have two arguments configured:
  • Rate table code – Code of a source rate table.
  • Column name – Name of the column in the source rate table
• Returns a list of distinct values from a specific column (second argument) of the source rate table (first argument).
• Does not return any specific labels, just the values themselves.
• Implements internal cache (a hash map): (argument 1 + argument 2) -> ({set of values}).
  • Initialized when a value provider is constructed.
  • Populated for each combination of argument values on each call to ReferenceFactorValueProvider#getValues() method for those combinations of arguments that are not found in the cache.
• The lookup of the source rate table is done in the same rate book as the table specifying this value provider.