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/*
 * Copyright 2015 Bridje Framework.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.bridje.ioc.thls.impl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class ThreadLocalStorage
{
    private final ThreadLocal>> threadLocalStorage;

    public ThreadLocalStorage()
    {
        threadLocalStorage = new ThreadLocal<>();
    }

    public  T get(Class cls)
    {
        Map> map = threadLocalStorage.get();
        if (map != null)
        {
            List objects = map.get(cls);
            if (objects != null && !objects.isEmpty())
            {
                return (T) objects.get(objects.size() - 1);
            }
        }
        return null;
    }

    public  void pop(Class cls)
    {
        Map> map = threadLocalStorage.get();
        if (map != null)
        {
            List objects = map.get(cls);
            if (objects != null && !objects.isEmpty())
            {
                objects.remove(objects.size() - 1);
            }
        }
    }

    public  void put(Class cls, T obj)
    {
        Map> map = threadLocalStorage.get();
        if (map == null)
        {
            map = new HashMap<>();
            threadLocalStorage.set(map);
        }
        List objects = map.get(cls);
        if (objects == null)
        {
            objects = new ArrayList<>();
            map.put(cls, objects);
        }
        objects.add(obj);
    }

}