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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you 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.jboss.netty.handler.codec.serialization;

import java.lang.ref.Reference;
import java.util.Collection;
import java.util.Map;
import java.util.Set;

abstract class ReferenceMap implements Map {

    private final Map> delegate;

    protected ReferenceMap(Map> delegate) {
        this.delegate = delegate;
    }

    abstract Reference fold(V value);

    private V unfold(Reference ref) {
        if (ref == null) {
            return null;
        }

        return ref.get();
    }

    public int size() {
        return delegate.size();
    }

    public boolean isEmpty() {
        return delegate.isEmpty();
    }

    public boolean containsKey(Object key) {
        return delegate.containsKey(key);
    }

    public boolean containsValue(Object value) {
        throw new UnsupportedOperationException();
    }

    public V get(Object key) {
        return unfold(delegate.get(key));
    }

    public V put(K key, V value) {
        return unfold(delegate.put(key, fold(value)));
    }

    public V remove(Object key) {
        return unfold(delegate.remove(key));
    }

    public void putAll(Map m) {
        for (Entry entry : m.entrySet()) {
            delegate.put(entry.getKey(), fold(entry.getValue()));
        }
    }

    public void clear() {
        delegate.clear();
    }

    public Set keySet() {
        return delegate.keySet();
    }

    public Collection values() {
        throw new UnsupportedOperationException();
    }

    public Set> entrySet() {
        throw new UnsupportedOperationException();
    }
}