/*

 * 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.util.Hashtable;

import java.util.Map;

import javax.persistence.NoResultException;

import javax.persistence.TypedQuery;

import com.nokia.helium.metadata.JpaDAO;

/**

 * Implements DAO for the Component.

 * Contains all helpers related to Component manipulation.

 *

 */

public class SysdefComponentDAO extends JpaDAO<SysdefComponent> {

    /**

     * Get a map of components rows based on the component name.

     * @return a map of (componentName, component).

     */

    public Map<String, SysdefComponent> getComponents() {

        Map<String, SysdefComponent> result = new Hashtable<String, SysdefComponent>();

        for (SysdefComponent component : this.getEntityManager().createQuery("SELECT c from SysdefComponent c", SysdefComponent.class).getResultList()) {

            result.put(component.getComponentId(), component);

        }

        return result;

    }

    /**

     * Get a component based on its model Id.

     * @param id

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

     */

    public SysdefComponent getComponentById(String id) {

        TypedQuery<SysdefComponent> query = this.getEntityManager().createQuery("SELECT c from SysdefComponent c where c.componentId=?1", SysdefComponent.class);

        query.setParameter(1, id);

        try {

            return query.getSingleResult();

        } catch (NoResultException ex) {

            return null;

        }

    }

}