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The cqf-fhir-npm library for the Clinical Quality Language Java reference implementation

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package org.cqframework.fhir.npm;

import java.io.IOException;
import java.io.InputStream;
import org.hl7.fhir.convertors.advisors.impl.BaseAdvisor_14_50;
import org.hl7.fhir.convertors.advisors.impl.BaseAdvisor_30_50;
import org.hl7.fhir.convertors.advisors.impl.BaseAdvisor_40_50;
import org.hl7.fhir.convertors.conv14_50.VersionConvertor_14_50;
import org.hl7.fhir.convertors.conv30_50.VersionConvertor_30_50;
import org.hl7.fhir.convertors.conv40_50.VersionConvertor_40_50;
import org.hl7.fhir.exceptions.FHIRException;
import org.hl7.fhir.exceptions.FHIRFormatError;
import org.hl7.fhir.r5.model.Library;
import org.hl7.fhir.utilities.VersionUtilities;

public class LibraryLoader implements ILibraryReader {

    private String version;

    public LibraryLoader(String version) {
        this.version = version;
    }

    @Override
    public Library readLibrary(InputStream stream) throws FHIRFormatError, IOException {
        if (VersionUtilities.isR2Ver(version)) {
            throw new FHIRException("Library is not supported in R2");
        } else if (VersionUtilities.isR2BVer(version)) {
            org.hl7.fhir.dstu2016may.model.Resource res =
                    new org.hl7.fhir.dstu2016may.formats.JsonParser().parse(stream);
            VersionConvertor_14_50 versionConvertor_14_50 = new VersionConvertor_14_50(new BaseAdvisor_14_50());
            return (Library) versionConvertor_14_50.convertResource(res);
        } else if (VersionUtilities.isR3Ver(version)) {
            org.hl7.fhir.dstu3.model.Resource res = new org.hl7.fhir.dstu3.formats.JsonParser().parse(stream);
            VersionConvertor_30_50 versionConvertor_30_50 = new VersionConvertor_30_50(new BaseAdvisor_30_50());
            return (Library) versionConvertor_30_50.convertResource(res);
        } else if (VersionUtilities.isR4Ver(version)) {
            org.hl7.fhir.r4.model.Resource res = new org.hl7.fhir.r4.formats.JsonParser().parse(stream);
            VersionConvertor_40_50 versionConvertor_40_50 = new VersionConvertor_40_50(new BaseAdvisor_40_50());
            return (Library) versionConvertor_40_50.convertResource(res);
        } else if (VersionUtilities.isR5Ver(version)) {
            return (Library) new org.hl7.fhir.r5.formats.JsonParser().parse(stream);
        } else {
            throw new FHIRException("Unknown Version '" + version + "'");
        }
    }
}