/*
 * Copyright 2012 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.common.storage;

import java.util.Map;
import java.util.Set;

import com.redhat.thermostat.common.dao.Converter;
import com.redhat.thermostat.common.model.Pojo;

class ChunkToPojoConverter {

    static <T extends Pojo> T convertChunkToPojo(Chunk resultChunk, Class<T> resultClass, Map<Class<?>, Converter<?>> converters) {
        try {
            if (converters != null) {
                Converter<?> converter = converters.get(resultClass);
                if (converter != null) {
                    return (T) converter.fromChunk(resultChunk);
                }
            }
            Pojo pojo = resultClass.newInstance();
            ChunkAdapter chunk = new ChunkAdapter(pojo, resultChunk.getCategory(), resultChunk.getReplace());
            Set<Key<?>> keys = resultChunk.getKeys();
            for (Key key : keys) {
                if (key == null) {
                    continue;
                }
                chunk.put(key, resultChunk.get(key));
            }
            return (T) chunk.getAdaptee();
        } catch (InstantiationException | IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }
}