com.quavo.osrs.network.handler.NetworkMessageRepository.java Source code

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Here is the source code for com.quavo.osrs.network.handler.NetworkMessageRepository.java

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/**
 * MIT License
 *
 * Copyright (c) 2017 Quavo
 * Copyright (c) 2017 Jordan Abraham
 * 
 * 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.quavo.osrs.network.handler;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;
import com.quavo.osrs.Constants;
import com.quavo.util.FileUtilities;

/**
 * @author _jordan <citellumrsps@gmail.com>
 */
public final class NetworkMessageRepository {

    /**
     * The {@link ImmutableMap} of {@link NetworkMessageListener}'s used to process protocol requests and
     * responses.
     */
    public static final ImmutableMap<Class<?>, NetworkMessageListener<NetworkMessage>> LISTENERS = buildNetworkListeners();

    /**
     * Builds the network listeners for this repository.
     * 
     * @return The created {@link ImmutableMap} of network listeners.
     */
    private static ImmutableMap<Class<?>, NetworkMessageListener<NetworkMessage>> buildNetworkListeners() {
        final ImmutableMap.Builder<Class<?>, NetworkMessageListener<NetworkMessage>> builder = ImmutableMap
                .builder();

        try {
            Class<?>[] classes = FileUtilities.getAllClasses(Constants.PRESENTATION + ".network.handler.listener");
            for (Class<?> clazz : classes) {
                Preconditions.checkNotNull(clazz, "Listener class is not usable.");// returns type too.

                Class<?> message = Class.forName(clazz.getGenericInterfaces()[0].toString()
                        .replace(Constants.PRESENTATION + ".network.handler.NetworkMessageListener<", "")
                        .replace(">", ""));

                // this is a safe cast.
                builder.put(message, (NetworkMessageListener<NetworkMessage>) clazz.newInstance());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return builder.build();
    }

    /**
     * Finds and returns a {@link NetworkMessageListener} for a {@link NetworkMessage} found in the network
     * channel.
     * 
     * @param message The {@link NetworkMessage} used.
     * @return The {@link NetworkMessageListener}.
     */
    public static NetworkMessageListener<NetworkMessage> getNetworkListener(NetworkMessage message) {
        Preconditions.checkArgument(LISTENERS.containsKey(message.getClass()),
                "Listener not found for the message request " + message.getClass().getSimpleName() + ".");

        return LISTENERS.get(message.getClass());
    }

}