package example;
import java.util.List;
import org.hl7.fhir.instance.model.api.IBaseResource;
import ca.uhn.fhir.model.api.IResource;
import ca.uhn.fhir.model.dstu2.resource.Patient;
import ca.uhn.fhir.model.primitive.InstantDt;
import ca.uhn.fhir.rest.annotation.RequiredParam;
import ca.uhn.fhir.rest.annotation.Search;
import ca.uhn.fhir.rest.param.StringParam;
import ca.uhn.fhir.rest.server.IBundleProvider;
import ca.uhn.fhir.rest.server.IResourceProvider;
@SuppressWarnings("null")
// START SNIPPET: provider
public class PagingPatientProvider implements IResourceProvider {
/**
* Search for Patient resources matching a given family name
*/
@Search
public IBundleProvider search(@RequiredParam(name = Patient.SP_FAMILY) StringParam theFamily) {
final InstantDt searchTime = InstantDt.withCurrentTime();
/**
* First, we'll search the database for a set of database row IDs that
* match the given search criteria. That way we can keep just the row IDs
* around, and load the actual resources on demand later as the client
* pages through them.
*/
final List<Long> matchingResourceIds = null; // <-- implement this
/**
* Return a bundle provider which can page through the IDs and return the
* resources that go with them.
*/
return new IBundleProvider() {
@Override
public Integer size() {
return matchingResourceIds.size();
}
@Override
public List<IBaseResource> getResources(int theFromIndex, int theToIndex) {
int end = Math.max(theToIndex, matchingResourceIds.size() - 1);
List<Long> idsToReturn = matchingResourceIds.subList(theFromIndex, end);
return loadResourcesByIds(idsToReturn);
}
@Override
public InstantDt getPublished() {
return searchTime;
}
@Override
public Integer preferredPageSize() {
// Typically this method just returns null
return null;
}
@Override
public String getUuid() {
return null;
}
};
}
/**
* Load a list of patient resources given their IDs
*/
private List<IBaseResource> loadResourcesByIds(List<Long> theIdsToReturn) {
// .. implement this search against the database ..
return null;
}
@Override
public Class<? extends IResource> getResourceType() {
return Patient.class;
}
}
// END SNIPPET: provider