NAID-3122 - Add confidentialityCode support to AllergyIntoleranceMapper.java

[martin-nhs]

What

Given the following XML which is parsed by the AllergyIntolleranceMapper:

<confidentialityCode
  code="NOPAT"
  codeSystem="2.16.840.1.113883.4.642.3.47"
  displayName="no disclosure to patient, family or caregivers without attending provider's authorization" />

When the element is mapped, then expect the bundle to contain:

{
  "meta": {
    "security": [
      {
        "system": "http://hl7.org/fhir/v3/ActCode",
        "code": "NOPAT",
        "display": "no disclosure to patient, family or caregivers without attending provider's authorization"
      }
    ]
  }
}

Why

Please include details of the reasoning for these changes

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section if this change will affect end users
• A corresponding change has been made to the Mapping Documentation repository

[adrianclay]

I suspect this refactoring won't be the most desirable once we've implemented a few of these mappers, but given my mindset of refactoring when the duplication is indeed visible and a problem, let's leave it as it is for now.

[ole4ryb]

I think it would be good to break a line after line 11 otherwise it is very difficult to read such a class.
Also, it would be good to have a line break between the constructor and the static variable.