# 3.7.2. Create a custom implementation for exporting data to FHIR

{% hint style="warning" %}
All custom implementations for exporting data to a FHIR instance must implement the *net.geoprism.registry.etl.fhir.FhirDataPopulator* interface.
{% endhint %}

```
package com.terraframe.demo;

import java.util.LinkedList;
import java.util.List;

import org.commongeoregistry.adapter.constants.GeometryType;
import org.hl7.fhir.r4.model.Bundle;
import org.hl7.fhir.r4.model.CodeableConcept;
import org.hl7.fhir.r4.model.Coding;
import org.hl7.fhir.r4.model.Location;
import org.hl7.fhir.r4.model.Organization;

import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import com.runwaysdk.business.Business;

import net.geoprism.registry.MasterList;
import net.geoprism.registry.MasterListVersion;
import net.geoprism.registry.etl.fhir.AbstractFhirDataPopulator;
import net.geoprism.registry.etl.fhir.Facility;
import net.geoprism.registry.etl.fhir.FhirDataPopulator;
import net.geoprism.registry.etl.fhir.FhirExportContext;
import net.geoprism.registry.model.ServerGeoObjectType;
import net.geoprism.registry.model.ServerHierarchyType;

public class DemoFhirDataPopulator extends AbstractFhirDataPopulator implements FhirDataPopulator
{
  private List<ServerHierarchyType> hierarchies;

  public DemoFhirDataPopulator()
  {
    super();

    this.hierarchies = new LinkedList<ServerHierarchyType>();
  }

  @Override
  public String getLabel()
  {
    return "Demo Export Implementation";
  }

  @Override
  public void configure(FhirExportContext context, MasterListVersion version, boolean resolveIds)
  {
    super.configure(context, version, resolveIds);

    MasterList list = version.getMasterlist();

    JsonArray hierarchies = list.getHierarchiesAsJson();

    for (int i = 0; i < hierarchies.size(); i++)
    {
      JsonObject hierarchy = hierarchies.get(i).getAsJsonObject();

      String hCode = hierarchy.get("code").getAsString();

      List<String> pCodes = list.getParentCodes(hierarchy);

      if (pCodes.size() > 0)
      {
        this.hierarchies.add(ServerHierarchyType.get(hCode));
      }
    }
  }

  @Override
  public void populate(Business row, Facility facility)
  {
    super.populate(row, facility);

    ServerGeoObjectType type = this.getList().getGeoObjectType();
    String label = type.getLabel().getValue();
    String system = this.getContext().getSystem();

    CodeableConcept concept = new CodeableConcept().setText(label).addCoding(new Coding(system, type.getCode(), label));

    Location location = facility.getLocation();
    location.addType(concept);
    location.getMeta().addProfile("http://ihe.net/fhir/StructureDefinition/IHE.mCSD.Location");

    Organization organization = facility.getOrganization();
    organization.addType(concept);
    organization.getMeta().addProfile("http://ihe.net/fhir/StructureDefinition/IHE.mCSD.Organization");

    if (type.getGeometryType().equals(GeometryType.MULTIPOINT))
    {
      location.getMeta().addProfile("http://ihe.net/fhir/StructureDefinition/IHE.mCSD.FacilityLocation");
      location.addType(new CodeableConcept().addCoding(new Coding("urn:ietf:rfc:3986", "urn:ihe:iti:mcsd:2019:facility", "Facility")));

      organization.getMeta().addProfile("http://ihe.net/fhir/StructureDefinition/IHE.mCSD.FacilityOrganization");
      organization.addType(new CodeableConcept().addCoding(new Coding("urn:ietf:rfc:3986", "urn:ihe:iti:mcsd:2019:facility", "Facility")));
    }
    else
    {
      location.getMeta().addProfile("http://ihe.net/fhir/StructureDefinition/IHE.mCSD.JurisdictionLocation");
      location.addType(new CodeableConcept().addCoding(new Coding("urn:ietf:rfc:3986", "urn:ihe:iti:mcsd:2019:jurisdiction", "Jurisdiction")));

      organization.getMeta().addProfile("http://ihe.net/fhir/StructureDefinition/IHE.mCSD.JurisdictionsOrganization");
      organization.addType(new CodeableConcept().addCoding(new Coding("urn:ietf:rfc:3986", "urn:ihe:iti:mcsd:2019:jurisdiction", "Jurisdiction")));
    }

    for (ServerHierarchyType hierarchy : this.hierarchies)
    {
      this.addHierarchyExtension(row, facility, hierarchy);
    }
  }

  @Override
  public void createExtraResources(Business row, Bundle bundle, Facility facility)
  {
  }

  @Override
  public void finish(Bundle bundle)
  {
  }
}
```


---

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