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Data Structures

Currency

Currency is a record describing currency and having the following fields:

  • id – a keyword identifying a currency unit (e.g. :EUR or :crypto/ETH);
  • numeric – a long value being a numeric identifier of ISO-standardized currencies (e.g. 978 or -1 for none);
  • scale – an integer of supported scale (decimal places, e.g. 2 or -1 for auto);
  • kind – a keyword with currency kind (e.g. :FIAT or :DECENTRALIZED);
  • domain – a keyword with currency domain (e.g. :ISO-4217 or :CRYPTO).

Internally numeric can be -1, meaning there is no numeric ID and scale can be -1 too, meaning the amount of currency can have any number of decimal places.

The currency domain is derived from an identifier if the identifier is namespaced. The derived ID is upper-cased. If there is no namespace the domain can be set to any keyword, with :ISO-4217 having special meaning in some operations as it marks official currencies.

Registry

Registry is a record describing a database of currencies with associated metdata and having the following fields:

  • cur-id->cur – a map of currency ID to currency record;
  • cur-nr->cur – a map of currency numeric ID to currency record;
  • ctr-id->cur – a map of country ID to currency record;
  • cur-id->ctr-ids – a map of currency ID to set of country IDs;
  • cur-id->localized – a map of locale ID to localized properties;
  • version – an optional string with registry version.

Money

Money is a record describing a monetary value and having the following fields:

  • currency – a Currency object;
  • amount – an amount of currency stored as a BigDecimal number.

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