IssuerServiceEJB.java

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 * the License. You may obtain a copy of the License at
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 * for the specific language governing rights and limitations under the
 * License.
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 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
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package org.dcm4chee.archive.issuer.impl;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.TypedQuery;

import org.dcm4chee.archive.entity.Issuer;
import org.dcm4chee.archive.issuer.IssuerService;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 *
 */
@Stateless
public class IssuerServiceEJB implements IssuerService {

    @PersistenceContext(name = "dcm4chee-arc", unitName="dcm4chee-arc")
    private EntityManager em;

    @Override
    public Issuer findOrCreate(Issuer issuer) {
        try {
            return find(issuer);
        } catch (NoResultException e) {
            em.persist(issuer);
            return issuer;
        }
    }

    private Issuer find(Issuer issuer) {
        String entityID = issuer.getLocalNamespaceEntityID();
        String entityUID = issuer.getUniversalEntityID();
        String entityUIDType = issuer.getUniversalEntityIDType();
        TypedQuery<Issuer> query;
        if (entityID == null) {
            query = em.createNamedQuery(Issuer.FIND_BY_ENTITY_UID, Issuer.class)
                .setParameter(1, entityUID)
                .setParameter(2, entityUIDType);
        } else if (entityUID == null) {
            query = em.createNamedQuery(Issuer.FIND_BY_ENTITY_ID, Issuer.class)
                .setParameter(1, entityID);
        } else {
            query = em.createNamedQuery(Issuer.FIND_BY_ENTITY_ID_OR_UID, Issuer.class)
                .setParameter(1, entityID)
                .setParameter(2, entityUID)
                .setParameter(3, entityUIDType);
        }
        return query.getSingleResult();
    }

}