Mapper::MapperRuntimeKeyInfo hashdecl Reference

Describes a runtime mapper field key. More...

Public Attributes
*hash< string, bool >	conflicting_keys
	Hash of conflicting keys, if any.
string	desc
	A description of the key.
*code	handler
	The code to handle the key at runtime. More...
bool	requires_field_type = False
	If the type of the value for the key must be the same as the field type.
*softlist< string >	requires_roles
	If the key can only be used if one or more other keys supplying the given roles are also present.
*string	returns_type
	If the key provides a value that returns a specific type.
*softlist< string >	unique_roles
	If the key provides some unique functionality. More...
string	value_type = "string"
	The type of value that must be assigned to this key.

Detailed Description

Describes a runtime mapper field key.

Member Data Documentation

handler

*code Mapper::MapperRuntimeKeyInfo::handler

The code to handle the key at runtime.

the signature of this closure or call reference depends on requires_roles:

• requires_roles contains value: auto sub (auto arg, auto val, hash<auto> ctx, *reference<bool> missing_input) {}
  • parameters:
    • arg: the argument to the runtime key in the mapping
    • val: the current value of the mapping, if any
    • ctx: mapper context info; will contain at least the following fields:
      • output-key: (string) provides the name of the output field currently being mapped
      • input: (hash) the current input record
    • missing_input: an output variable; set to True if the handler could not resolve the value because input was missing
• requires_roles does not contain value: auto sub (auto arg, hash<auto> ctx, *reference<bool> missing_input) {}
  • parameters:
    • arg: the argument to the runtime key in the mapping
    • ctx: mapper context info; will contain at least the following fields:
      • output-key: (string) provides the name of the output field currently being mapped
      • input: (hash) the current input record
    • missing_input: an output variable; set to True if the handler could not resolve the value because input was missing

In both cases the return value is the value to use for the field

unique_roles

*softlist<string> Mapper::MapperRuntimeKeyInfo::unique_roles

If the key provides some unique functionality.

only one key providing the given functionality can be included in an output field; this is a list so that keys can provide more than one unique function