Invalid Program Enrollment Rule

InvalidProgramEnrollmentRules.java

package org.openmrs.module.dataintegrity;

import org.hibernate.Criteria;
import org.hibernate.SessionFactory;
import org.hibernate.criterion.Restrictions;
import org.openmrs.PatientProgram;
import org.openmrs.api.context.Context;
import org.openmrs.module.dataintegrity.rule.RuleDefn;
import org.openmrs.module.dataintegrity.rule.RuleResult;

import java.util.ArrayList;
import java.util.List;

public class InvalidProgramEnrollmentRules implements RuleDefn<PatientProgram> {

	@Override
	public List<RuleResult<PatientProgram>> evaluate() {
		List<RuleResult<PatientProgram>> ruleResults = new ArrayList<>();

		Criteria criteria = getSessionFactory().getCurrentSession()
				.createCriteria(PatientProgram.class,"patientProgram")
				.createAlias("patientProgram.program", "program")
				.createAlias("patientProgram.patient", "patient")
				.add(Restrictions.eq("program.name","Prenatal Care Program"))
				.add(Restrictions.eq("patient.gender", "M"));

		List<PatientProgram> violatedPatientPrograms = criteria.list();

		return patientProgramToRuleResultTransformer(violatedPatientPrograms,"Male patients in Pregnancy program");
	}


	private SessionFactory getSessionFactory(){
		return Context.getRegisteredComponent("sessionFactory",SessionFactory.class);
	}

	private List<RuleResult<PatientProgram>> patientProgramToRuleResultTransformer(List<PatientProgram> patients, String notes){

		List<RuleResult<PatientProgram>> ruleResults = new ArrayList<>();

		for (PatientProgram patient : patients) {
			RuleResult<PatientProgram> ruleResult = new RuleResult<>();
			ruleResult.setActionUrl("");
			ruleResult.setNotes(notes);
			ruleResult.setEntity(patient);

			ruleResults.add(ruleResult);
		}

		return ruleResults;
	}
}