001/* 
002 * JKNIV, whinstone one contract to access your database.
003 * 
004 * Copyright (C) 2017, the original author or authors.
005 *
006 * This library is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 2.1 of the License.
010 * 
011 * This library is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014 * Lesser General Public License for more details.
015 * 
016 * You should have received a copy of the GNU Lesser General Public
017 * License along with this library; if not, write to the Free Software Foundation, Inc., 
018 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
019 */
020package net.sf.jkniv.whinstone.jpa2.commands;
021
022import javax.persistence.EntityManager;
023
024import net.sf.jkniv.exception.HandleableException;
025import net.sf.jkniv.whinstone.Queryable;
026import net.sf.jkniv.whinstone.commands.Command;
027import net.sf.jkniv.whinstone.commands.CommandHandler;
028
029public class MergeCommand implements Command
030{
031    protected final Queryable queryable;
032    protected EntityManager em;
033    protected HandleableException handlerException;
034    
035    public MergeCommand(EntityManager em, Queryable queryable)
036    {
037        super();
038        this.em = em;
039        this.queryable = queryable;
040    }
041    
042    @Override
043    public <T> Command with(T stmt)
044    {
045        this.em = (EntityManager) stmt;
046        return this;
047    }
048    
049    @Override
050    public Command with(HandleableException handlerException)
051    {
052        this.handlerException = handlerException;
053        return this;
054    }
055    
056    @Override
057    public Command with(CommandHandler commandHandler)
058    {
059        return this;
060    }
061    
062    @Override
063    @SuppressWarnings("unchecked")
064    public <T> T execute()
065    {
066        T merged = em.merge((T)queryable.getParams());
067        return merged;
068    }
069}