/*
 * This file is part of NucleusFramework for Bukkit, licensed under the MIT License (MIT).
 *
 * Copyright (c) JCThePants (www.jcwhatever.com)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package com.jcwhatever.nucleus.utils;

import com.jcwhatever.nucleus.mixins.IMeta;

import java.util.HashMap;
import java.util.Map;
import javax.annotation.Nullable;

/**
 * A meta data storage container.
 */
public class MetaStore implements IMeta {

    private final int _size;
    private Map<Object, Object> _meta;

    /**
     * Constructor.
     *
     * <p>Initializes with an initial capacity of 3.</p>
     */
    public MetaStore() {
        this(3);
    }

    /**
     * Constructor.
     *
     * @param size  The initial capacity.
     */
    public MetaStore(int size) {
        _size = size;
    }

    @Nullable
    @Override
    public <T> T getMeta(MetaKey<T> key) {
        PreCon.notNull(key);

        if (_meta == null)
            return null;

        @SuppressWarnings("unchecked")
        T result = (T)_meta.get(key);

        return result;
    }

    @Nullable
    @Override
    public Object getMetaObject(Object key) {
        PreCon.notNull(key);

        if (_meta == null)
            return null;

        return _meta.get(key);
    }

    @Override
    public <T> void setMeta(MetaKey<T> key, @Nullable T value) {
        PreCon.notNull(key);

        if (_meta == null) {
            if (value == null)
                return;

            _meta = new HashMap<>(_size);
        }

        if (value == null) {
            _meta.remove(key);
        }
        else {
            _meta.put(key, value);
        }
    }
}

add MetaStore