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/*
 * Copyright 2015 Austin Keener, Michael Ritter, Florian Spieß, and the JDA contributors
 *
 * 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 net.dv8tion.jda.api.hooks;

import net.dv8tion.jda.api.events.GenericEvent;
import net.dv8tion.jda.internal.JDAImpl;
import net.dv8tion.jda.internal.utils.JDALogger;
import org.jetbrains.annotations.Unmodifiable;

import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

/**
 * An {@link net.dv8tion.jda.api.hooks.IEventManager IEventManager} implementation
 * that uses the {@link net.dv8tion.jda.api.hooks.EventListener EventListener} interface for
 * event listeners.
 *
 * This only accepts listeners that implement {@link net.dv8tion.jda.api.hooks.EventListener EventListener}
 * 
An adapter implementation is {@link net.dv8tion.jda.api.hooks.ListenerAdapter ListenerAdapter} which
 * provides methods for each individual {@link net.dv8tion.jda.api.events.Event}.
 *
 * 
This is the default IEventManager used by JDA
 *
 * @see net.dv8tion.jda.api.hooks.AnnotatedEventManager
 * @see net.dv8tion.jda.api.hooks.IEventManager
 */
public class InterfacedEventManager implements IEventManager
{
    private final CopyOnWriteArrayList listeners = new CopyOnWriteArrayList<>();

    public InterfacedEventManager()
    {

    }

    /**
     * {@inheritDoc}
     *
     * @throws IllegalArgumentException
     *         If the provided listener does not implement {@link net.dv8tion.jda.api.hooks.EventListener EventListener}
     */
    @Override
    public void register(@Nonnull Object listener)
    {
        if (!(listener instanceof EventListener))
        {
            throw new IllegalArgumentException("Listener must implement EventListener");
        }
        listeners.add((EventListener) listener);
    }

    @Override
    public void unregister(@Nonnull Object listener)
    {
        if (!(listener instanceof EventListener))
        {
            //noinspection ConstantConditions
            JDALogger.getLog(getClass()).warn(
                    "Trying to remove a listener that does not implement EventListener: {}",
                    listener == null ? "null" : listener.getClass().getName());
        }

        //noinspection SuspiciousMethodCalls
        listeners.remove(listener);
    }

    @Nonnull
    @Override
    @Unmodifiable
    public List