l2server.util.ClassPathUtil.java Source code

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Here is the source code for l2server.util.ClassPathUtil.java

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/*
 * Copyright (C) 2004-2017 L2J Unity
 * 
 * This file is part of L2J Unity.
 * 
 * L2J Unity 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.
 * 
 * L2J Unity 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 l2server.util;

import com.google.common.reflect.ClassPath;
import com.google.common.reflect.ClassPath.ClassInfo;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author UnAfraid
 */
@SuppressWarnings("unchecked")
public class ClassPathUtil {
    public static <T> List<Class<T>> getAllClassesExtending(Class<T> targetClass) throws IOException {
        final ClassPath classPath = ClassPath.from(ClassLoader.getSystemClassLoader());
        //@formatter:off
        return classPath.getTopLevelClasses().stream().map(ClassInfo::load)
                .filter(clazz -> targetClass.isAssignableFrom(clazz))
                .filter(clazz -> !Modifier.isAbstract(clazz.getModifiers()))
                .filter(clazz -> !Modifier.isInterface(clazz.getModifiers())).map(clazz -> (Class<T>) clazz)
                .collect(Collectors.toList());
        //@formatter:on
    }

    public static <T> List<Class<T>> getAllClassesExtending(String packageName, Class<T> targetClass)
            throws IOException {
        final ClassPath classPath = ClassPath.from(ClassLoader.getSystemClassLoader());
        //@formatter:off
        return classPath.getTopLevelClassesRecursive(packageName).stream().map(ClassInfo::load)
                .filter(clazz -> targetClass.isAssignableFrom(clazz))
                .filter(clazz -> !Modifier.isAbstract(clazz.getModifiers()))
                .filter(clazz -> !Modifier.isInterface(clazz.getModifiers())).map(clazz -> (Class<T>) clazz)
                .collect(Collectors.toList());
        //@formatter:on
    }

    public static List<Method> getAllMethodsAnnotatedWith(Class<? extends Annotation> annotationClass)
            throws IOException {
        final ClassPath classPath = ClassPath.from(ClassLoader.getSystemClassLoader());
        //@formatter:off
        return classPath.getTopLevelClasses().stream().map(ClassInfo::load)
                .flatMap(clazz -> Arrays.stream(clazz.getDeclaredMethods()))
                .filter(method -> method.isAnnotationPresent(annotationClass)).collect(Collectors.toList());
        //@formatter:on
    }

    public static List<Method> getAllMethodsAnnotatedWith(String packageName,
            Class<? extends Annotation> annotationClass) throws IOException {
        final ClassPath classPath = ClassPath.from(ClassLoader.getSystemClassLoader());
        //@formatter:off
        return classPath.getTopLevelClassesRecursive(packageName).stream().map(ClassInfo::load)
                .flatMap(clazz -> Arrays.stream(clazz.getDeclaredMethods()))
                .filter(method -> method.isAnnotationPresent(annotationClass)).collect(Collectors.toList());
        //@formatter:on
    }
}