de.xaniox.heavyspleef.core.event.GlobalEventBus.java Source code

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Here is the source code for de.xaniox.heavyspleef.core.event.GlobalEventBus.java

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/*
 * This file is part of HeavySpleef.
 * Copyright (c) 2014-2016 Matthias Werning
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package de.xaniox.heavyspleef.core.event;

import com.google.common.collect.Sets;
import org.apache.commons.lang.Validate;

import java.util.Set;
import java.util.logging.Logger;

public class GlobalEventBus extends EventBus {

    private final Logger logger;
    private Set<EventBus> singleInstanceBusMap;
    private Set<SpleefListener> globalListeners;

    public GlobalEventBus(Logger logger) {
        super(logger);

        this.logger = logger;
        this.singleInstanceBusMap = Sets.newHashSet();
        this.globalListeners = Sets.newHashSet();
    }

    @Override
    public void registerListener(SpleefListener listener) {
        registerListener(listener, false);
    }

    @Override
    public void registerListener(SpleefListener listener, boolean registerSuper) {
        Validate.isTrue(!globalListeners.contains(listener), "Global listener already registered");
        for (EventBus bus : singleInstanceBusMap) {
            if (bus.isRegistered(listener)) {
                throw new IllegalArgumentException("This listener has already been registered on a child EventBus");
            }
        }

        globalListeners.add(listener);
        for (EventBus bus : singleInstanceBusMap) {
            bus.registerListener(listener, registerSuper);
        }
    }

    @Override
    public void unregister(SpleefListener listener) {
        Validate.isTrue(globalListeners.contains(listener), "Global listener has not been registered");

        globalListeners.remove(listener);
        for (EventBus bus : singleInstanceBusMap) {
            bus.unregister(listener);
        }
    }

    @Override
    public void callEvent(Event event) {
    }

    public EventBus newChildBus() {
        EventBus bus = new EventBus(logger);

        singleInstanceBusMap.add(bus);
        for (SpleefListener listener : globalListeners) {
            bus.registerListener(listener);
        }

        return bus;
    }

}