org.spongepowered.api.event.SpongeEventFactoryUtils.java Source code

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Here is the source code for org.spongepowered.api.event.SpongeEventFactoryUtils.java

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/*
 * This file is part of SpongeAPI, licensed under the MIT License (MIT).
 *
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * 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 org.spongepowered.api.event;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.spongepowered.api.Game;
import org.spongepowered.api.event.game.state.GameStateEvent;
import org.spongepowered.api.eventgencore.classwrapper.reflection.ReflectionUtils;
import org.spongepowered.api.util.event.factory.ClassGeneratorProvider;
import org.spongepowered.api.util.event.factory.EventFactory;
import org.spongepowered.api.util.event.factory.NullPolicy;
import org.spongepowered.api.util.event.factory.plugin.AccessorModifierEventFactoryPlugin;
import org.spongepowered.api.util.event.factory.plugin.EventFactoryPlugin;

import java.util.List;
import java.util.Map;

/**
 * A class to hold the logic for {@link SpongeEventFactory}
 *
 * <p>Since {@link SpongeEventFactory} is automatically generated, the formatting can get messed up.
 * This class ensures that the core logic stays readable.</p>
 */
public class SpongeEventFactoryUtils {

    private static final ClassGeneratorProvider factoryProvider = new ClassGeneratorProvider(
            "org.spongepowered.api.event.impl");

    public static List<? extends EventFactoryPlugin> plugins = Lists
            .newArrayList(new AccessorModifierEventFactoryPlugin());

    private static final LoadingCache<Class<?>, EventFactory<?>> factories = CacheBuilder.newBuilder()
            .build(new CacheLoader<Class<?>, EventFactory<?>>() {

                @Override
                public EventFactory<?> load(Class<?> type) {
                    return factoryProvider.create(type, ReflectionUtils.getBaseClass(type).getActualClass(),
                            plugins);
                }
            });

    static {
        factoryProvider.setNullPolicy(NullPolicy.NON_NULL_BY_DEFAULT);
    }

    /**
     * Creates an event class from an interface and a map of property names to values.
     *
     * @param type The event interface to generate a class for
     * @param values The map of property names to values
     * @param <T> The type of event to be created
     * @return The generated event class.
     */
    @SuppressWarnings("unchecked")
    public static <T> T createEventImpl(Class<T> type, Map<String, Object> values) {
        return (T) factories.getUnchecked(type).apply(values);
    }

    /**
     * Creates a new {@link GameStateEvent} of the given type.
     *
     * @param type The type of the state event
     * @param game The game instance for this {@link GameEvent}
     * @param <T> The type of the state event
     * @return A new instance of the event
     */
    public static <T extends GameStateEvent> T createState(Class<T> type, Game game) {
        Map<String, Object> values = Maps.newHashMapWithExpectedSize(1);
        values.put("game", game);
        values.put("state", game.getState());
        return SpongeEventFactoryUtils.createEventImpl(type, values);
    }

}