io.github.linuxforhealth.core.terminology.TerminologyLookup Maven / Gradle / Ivy

/*
 * (C) Copyright IBM Corp. 2020, 2021
 *
 * SPDX-License-Identifier: Apache-2.0
 */
package io.github.linuxforhealth.core.terminology;

import java.util.Map;
import com.google.common.collect.ImmutableMap;
import com.ibm.fhir.model.resource.CodeSystem;
import com.ibm.fhir.model.type.Code;
import com.ibm.fhir.model.type.Uri;
import com.ibm.fhir.registry.FHIRRegistry;
import com.ibm.fhir.term.service.FHIRTermService;
import com.ibm.fhir.term.service.LookupOutcome;

public class TerminologyLookup {

    private static final FHIRRegistry REGISTRY = FHIRRegistry.getInstance();
    private static final FHIRTermService TERMINOLOGY_SEVICE = FHIRTermService.getInstance();
    private static TerminologyLookup termInstance;
    static Map alternativeCodingSystemMapping = ImmutableMap.of("v2-0005", "v3-Race", "CDCREC",
            "v3-Race");

    private TerminologyLookup() {
    }

    public static SimpleCode lookup(String system, String value) {
        String codingSystemName = system;
        if (alternativeCodingSystemMapping.containsKey(system)) {
            codingSystemName = alternativeCodingSystemMapping.get(system);
        }
        Uri url = getSystemUrl(codingSystemName);

        if (url != null) {
            Code c = Code.of(value);
            LookupOutcome outcome = TERMINOLOGY_SEVICE.lookup(url, null, c);
            if (outcome != null && outcome.getDisplay() != null) {
                return new SimpleCode(value, url.getValue(), outcome.getDisplay().getValue());
            } else {
                // Failed to find the code. Is it a registered URL?
                CodeSystem s = null;
                s = REGISTRY.getResource(url.getValue(), CodeSystem.class);
                if (s != null && s.getUrl() != null) {
                    // If registered system, then it was a bad code 
                    return new SimpleCode(value, url.getValue(), null);
                }
                // Else system known to us but not registered, so we can't tell goodness of code
                return new SimpleCode(value, url.getValue(), "");
            }
        }
        return null;
    }

    private static Uri getSystemUrl(String value) {
        String sys = UrlLookup.getSystemUrl(value);
        return (sys != null) ? Uri.uri(sys) : null;
    }

    public static void init() {
        if (termInstance == null) {
            termInstance = new TerminologyLookup();
        }
    }

}