/*

 * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:  

 *

 */

package com.nokia.helium.metadata.model.metadata;

import java.io.File;

import java.util.List;

import javax.persistence.NoResultException;

import javax.persistence.TypedQuery;

import com.nokia.helium.metadata.JpaDAO;

/**

 * Implements DAO for the Unit.

 * Contains all helpers related to Unit manipulation.

 *

 */

public class SysdefUnitDAO extends JpaDAO<SysdefUnit> {

    /**

     * Get a map of units rows based on the unit name.

     * @return a map of (unitName, unit).

     */

    public List<SysdefUnit> getUnits() {

        return this.getEntityManager().createQuery("SELECT c from SysdefUnit c", SysdefUnit.class).getResultList();

    }

    /**

     * Get a unit based on its model Id.

     * @param id

     * @return the entity representing the unit of null if not found.

     */

    public SysdefUnit getUnitByLocation(File epocroot, File location) {

        return getUnitByLocation(epocroot.toURI().relativize(location.toURI()).getPath());

    }

    public SysdefUnit getUnitByLocation(String location) {

        TypedQuery<SysdefUnit> query = this.getEntityManager().createQuery("SELECT u from SysdefUnit u where u.location=?1", SysdefUnit.class);

        query.setParameter(1, location);

        try {

            return query.getSingleResult();

        } catch (NoResultException ex) {

            return null;

        }

    }

}