org.openmrs.module.rulesengine.rule.WeightBasedDosageRule Maven / Gradle / Ivy

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package org.openmrs.module.rulesengine.rule;

import org.openmrs.Patient;
import org.openmrs.module.rulesengine.domain.DosageRequest;
import org.openmrs.module.rulesengine.domain.Dose;
import org.openmrs.module.rulesengine.domain.RuleName;
import org.openmrs.module.rulesengine.service.ObservationService;
import org.openmrs.module.rulesengine.service.PatientService;
import org.openmrs.module.rulesengine.util.BahmniMath;
import org.openmrs.module.rulesengine.util.Validator;

@RuleName(name = "mg/kg")
public class WeightBasedDosageRule implements DosageRule {

    public Dose calculateDose(DosageRequest request) throws Exception {
        Patient patient = PatientService.getPatientByUuid(request.getPatientUuid());

        Double weight = ObservationService.getLatestObsValueNumeric(patient, ObservationService.ConceptRepo.WEIGHT, request.getVisitUuid());
        Validator.validate(weight, ObservationService.ConceptRepo.WEIGHT);

        Double roundUpValue = BahmniMath.getTwoDigitRoundUpValue(request.getBaseDose() * weight);
        return new Dose(request.getDrugName(),roundUpValue, Dose.DoseUnit.mg);
    }

}