/*
 * ServerListPlus - https://git.io/slp
 * Copyright (C) 2014 Minecrell (https://github.com/Minecrell)
 *
 * This program 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.minecrell.serverlistplus.core.config.storage;

import com.google.common.base.Preconditions;
import com.google.common.collect.ClassToInstanceMap;

public class FallbackInstanceStorage<B> extends ClassToInstanceStorage<B> {
    private final InstanceStorage<B> defaults;

    protected FallbackInstanceStorage(ClassToInstanceMap<B> instances, InstanceStorage<B> defaults) {
        super(instances);
        this.defaults = Preconditions.checkNotNull(defaults, "defaults");
    }

    @Override
    public <T extends B> T get(Class<T> type) {
        T result = super.get(type);
        return result != null ? result : defaults.get(type);
    }
}