com.github.wolfdogs.kemono.util.event.AbstractManagedEventManager.java Source code

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Here is the source code for com.github.wolfdogs.kemono.util.event.AbstractManagedEventManager.java

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/**
 * Copyright (C) 2012 MK124
 *
 * 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 com.github.wolfdogs.kemono.util.event;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;

import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;

/**
 * 
 * 
 * @author MK124
 */
abstract class AbstractManagedEventManager implements EventManager {
    protected static class HandlerEntryImpl implements HandlerEntry {
        private Reference<AbstractManagedEventManager> eventManagerReference;
        private HandlerEntry handlerEntry;

        protected HandlerEntryImpl(AbstractManagedEventManager eventManager, HandlerEntry handlerEntry) {
            eventManagerReference = new WeakReference<>(eventManager);
            this.handlerEntry = handlerEntry;
        }

        @Override
        protected void finalize() throws Throwable {
            super.finalize();
            cancel();
        }

        @Override
        public EventManager getEventManager() {
            return eventManagerReference.get();
        }

        @Override
        public void cancel() {
            if (handlerEntry == null)
                return;

            AbstractManagedEventManager eventManager = eventManagerReference.get();
            if (eventManager != null)
                eventManager.remove(this);

            handlerEntry.cancel();

            handlerEntry = null;
            eventManager = null;
        }

        @Override
        public Class<? extends Event> getType() {
            if (handlerEntry == null)
                return null;
            return handlerEntry.getType();
        }

        @Override
        public Object getRelatedObject() {
            if (handlerEntry == null)
                return null;
            return handlerEntry.getRelatedObject();
        }

        @Override
        public Class<?> getRelatedClass() {
            if (handlerEntry == null)
                return null;
            return handlerEntry.getRelatedClass();
        }

        @Override
        public EventHandler getHandler() {
            if (handlerEntry == null)
                return null;
            return handlerEntry.getHandler();
        }

        @Override
        public short getPriority() {
            if (handlerEntry == null)
                return 0;
            return handlerEntry.getPriority();
        }
    }

    private final EventManager eventManager;

    protected AbstractManagedEventManager(EventManager eventManager) {
        this.eventManager = eventManager;
    }

    @Override
    protected void finalize() throws Throwable {
        super.finalize();
        cancelAll();
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.DEFAULT_STYLE);
    }

    protected abstract HandlerEntry register(HandlerEntry originalEntry);

    protected abstract void remove(HandlerEntry handlerEntryImpl);

    public abstract void cancelAll();

    @Override
    public HandlerEntry registerHandler(Class<? extends Event> type, EventHandler handler,
            HandlerPriority priority) {
        HandlerEntry entry = eventManager.registerHandler(type, handler, priority);
        return register(entry);
    }

    @Override
    public HandlerEntry registerHandler(Class<? extends Event> type, EventHandler handler, short priority) {
        HandlerEntry entry = eventManager.registerHandler(type, handler, priority);
        return register(entry);
    }

    @Override
    public HandlerEntry registerHandler(Class<? extends Event> type, Class<?> clz, EventHandler handler,
            HandlerPriority priority) {
        HandlerEntry entry = eventManager.registerHandler(type, clz, handler, priority);
        return register(entry);
    }

    @Override
    public HandlerEntry registerHandler(Class<? extends Event> type, Class<?> clz, EventHandler handler,
            short priority) {
        HandlerEntry entry = eventManager.registerHandler(type, clz, handler, priority);
        return register(entry);
    }

    @Override
    public HandlerEntry registerHandler(Class<? extends Event> type, Object object, EventHandler handler,
            HandlerPriority priority) {
        HandlerEntry entry = eventManager.registerHandler(type, object, handler, priority);
        return register(entry);
    }

    @Override
    public HandlerEntry registerHandler(Class<? extends Event> type, Object object, EventHandler handler,
            short priority) {
        HandlerEntry entry = eventManager.registerHandler(type, object, handler, priority);
        return register(entry);
    }

    @Override
    public <T extends Event> void dispatchEvent(T event, Object... objects) {
        eventManager.dispatchEvent(event, objects);
    }

    @Override
    public <T extends Event> void dispatchEvent(ThrowableHandler handler, T event, Object... objects) {
        eventManager.dispatchEvent(handler, event, objects);
    }
}