br.com.blackhubos.eventozero.hook.Hooks.java Source code

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Here is the source code for br.com.blackhubos.eventozero.hook.Hooks.java

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/**
 *
 * EventoZero - Advanced event factory and executor for Bukkit and Spigot.
 * Copyright  2016 BlackHub OS and contributors.
 *
 * 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 br.com.blackhubos.eventozero.hook;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.google.common.collect.ClassToInstanceMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.MutableClassToInstanceMap;
import com.google.common.reflect.ClassPath;
import com.google.common.reflect.ClassPath.ClassInfo;

import br.com.blackhubos.eventozero.EventoZero;
import io.github.bktlib.reflect.MethodAccessor;

public class Hooks {
    private static final ClassLoader classLoader;
    private static final Logger logger = EventoZero.getInstance().getLogger();
    private static final ClassToInstanceMap<Hook> hooks = MutableClassToInstanceMap.create();

    static {
        MethodAccessor<ClassLoader> getClassLoaderMethod = MethodAccessor.access(EventoZero.getInstance(),
                "getClassLoader");
        classLoader = getClassLoaderMethod.invoke().get();
    }

    /**
     * Pega um hook a partir de uma classe.
     * 
     * @param hookClass
     *            Classe do hook
     * @return A instancia do hook associado a classe informada.
     */
    @SuppressWarnings("unchecked")
    public static <T> T getHook(Class<T> hookClass) {
        return (T) hooks.get(hookClass);
    }

    /**
     * @return Uma {@ ImmutableSet} contendo todos os hooks carregados.
     */
    public static ImmutableSet<Hook> getHooks() {
        return ImmutableSet.copyOf(hooks.values());
    }

    @SuppressWarnings("unchecked")
    public static void hookAll() {

        try {
            ImmutableSet<ClassInfo> classes = ClassPath.from(classLoader)
                    .getTopLevelClasses("br.com.blackhubos.eventozero.hook.hooks");

            classes.forEach(cls -> {
                try {
                    Class<?> hookClass = Class.forName(cls.getName());

                    if (!Hook.class.isAssignableFrom(hookClass)) {
                        return;
                    }

                    Hook hookInst = (Hook) hookClass.newInstance();

                    if (hookInst.canBeHooked()) {
                        hookInst.hook();
                        hooks.put((Class<Hook>) hookClass, hookInst);
                        logger.info(String.format("[Hooks] %s carregado com sucesso.", cls.getSimpleName()));
                    }
                } catch (Exception e) {
                    logger.log(Level.SEVERE, "Could not load hook " + cls.getName());
                    logger.log(Level.SEVERE, "See the stacktrace: ");
                    e.printStackTrace();
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}