org.dcm4chee.archive.ejb.query.CompositeQueryBean.java Source code

Introduction

Here is the source code for org.dcm4chee.archive.ejb.query.CompositeQueryBean.java

Source

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.dcm4chee.archive.ejb.query;

import java.sql.Connection;
import java.sql.SQLException;

import javax.annotation.PostConstruct;
import javax.ejb.EJBException;
import javax.ejb.Remove;
import javax.ejb.Stateful;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
import javax.sql.DataSource;

import org.dcm4che.data.Attributes;
import org.hibernate.SessionFactory;
import org.hibernate.StatelessSession;
import org.hibernate.ejb.HibernateEntityManagerFactory;

/**
 * @author Gunter Zeilinger <gunterze@gmail.com>
 */
@Stateful
@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
public class CompositeQueryBean implements CompositeQuery {

    // injection specified in META-INF/ejb-jar.xml
    private DataSource dataSource;

    @PersistenceUnit(unitName = "dcm4chee-arc")
    private EntityManagerFactory emf;

    private Connection connection;

    private StatelessSession session;

    private CompositeQueryImpl query;

    @PostConstruct
    protected void init() {
        SessionFactory sessionFactory = ((HibernateEntityManagerFactory) emf).getSessionFactory();
        try {
            connection = dataSource.getConnection();
        } catch (SQLException e) {
            throw new EJBException(e);
        }
        session = sessionFactory.openStatelessSession(connection);
    }

    @Override
    public void findPatients(IDWithIssuer[] pids, Attributes keys, QueryParam queryParam) {
        query = new PatientQueryImpl(session, pids, keys, queryParam);
    }

    @Override
    public void findStudies(IDWithIssuer[] pids, Attributes keys, QueryParam queryParam) {
        query = new StudyQueryImpl(session, pids, keys, queryParam);
    }

    @Override
    public void findSeries(IDWithIssuer[] pids, Attributes keys, QueryParam queryParam) {
        query = new SeriesQueryImpl(session, pids, keys, queryParam);
    }

    @Override
    public void findInstances(IDWithIssuer[] pids, Attributes keys, QueryParam queryParam) {
        query = new InstanceQueryImpl(session, pids, keys, queryParam);
    }

    @Override
    public boolean optionalKeyNotSupported() {
        checkResults();
        return query.optionalKeyNotSupported();
    }

    @Override
    public boolean hasMoreMatches() {
        checkResults();
        return query.hasMoreMatches();
    }

    @Override
    public Attributes nextMatch() {
        checkResults();
        return query.nextMatch();
    }

    private void checkResults() {
        if (query == null)
            throw new IllegalStateException("results not initalized");
    }

    @Override
    @Remove
    public void close() {
        StatelessSession s = session;
        Connection c = connection;
        connection = null;
        session = null;
        query = null;
        s.close();
        try {
            c.close();
        } catch (SQLException e) {
            throw new EJBException(e);
        }
    }
}