/*
 * Copyright 2012, 2013 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.storage.core;

import java.util.Objects;

import com.redhat.thermostat.storage.internal.AdaptedCategory;
import com.redhat.thermostat.storage.model.Pojo;

/**
 * 
 * Adapts a given category to an aggregate equivalent.
 *
 * @param <T> The source data type.
 * @param <S> The target data type after adaptation.
 */
public final class CategoryAdapter<T extends Pojo, S extends Pojo> {

    private final Category<T> sourceCategory;
    
    /**
     * Constructor.
     * 
     * @param sourceCategory
     *            A known source category.
     * @throws NullPointerException
     *             if sourceCategory was null.
     * @throws IllegalArgumentException
     *             if sourceCategory is not known.
     */
    public CategoryAdapter(Category<T> sourceCategory) {
        Objects.requireNonNull(sourceCategory);
        if (!Categories.contains(sourceCategory.getName())) {
            throw new IllegalStateException("Only registered categories can be adapted!");
        }
        this.sourceCategory = sourceCategory;
    }
    
    public Category<S> getAdapted(Class<S> targetType) {
        AdaptedCategory<S, T> adapted = new AdaptedCategory<>(sourceCategory, targetType);
        return adapted;
    }
}
