/*
 * This file is part of Event Implementation Generator, 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.eventgencore.classwrapper.reflection;

import org.spongepowered.api.eventgencore.annotation.ImplementedBy;

import java.util.ArrayDeque;
import java.util.Queue;

public class ReflectionUtils {

    public static ReflectionClassWrapper getBaseClass(Class<?> target, Class<?> annotation) {
        ImplementedBy implementedBy = null;
        final Queue<Class<?>> queue = new ArrayDeque<Class<?>>();

        queue.add(target);
        Class<?> scannedType;

        while ((scannedType = queue.poll()) != null) {
            if ((implementedBy = scannedType.getAnnotation(ImplementedBy.class)) != null) {
                break;
            }
            for (Class<?> implInterfaces : scannedType.getInterfaces()) {
                queue.offer(implInterfaces);
            }
        }

        if (implementedBy != null) {
            return new ReflectionClassWrapper(implementedBy.value());
        }
        throw new RuntimeException("Congratulations. You've attempted to create an event which doesn't have "
                + "an @ImplementedBy annotation, on itself of any of its superinterfaces. "
                + "If your event extends Event, then, well, something's mess up pretty badly. "
                + "If not: *WHY* aren't you extending Event????");
    }

}

/*
 * This file is part of Event Implementation Generator, 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.eventgencore.classwrapper.reflection;

import org.spongepowered.api.eventgencore.annotation.ImplementedBy;

import java.util.ArrayDeque;
import java.util.Queue;

public class ReflectionUtils {

    public static ReflectionClassWrapper getBaseClass(Class<?> target, Class<?> annotation) {
        ImplementedBy implementedBy = null;
        final Queue<Class<?>> queue = new ArrayDeque<Class<?>>();

        queue.add(target);
        Class<?> scannedType;

        while ((scannedType = queue.poll()) != null) {
            if ((implementedBy = scannedType.getAnnotation(ImplementedBy.class)) != null) {
                break;
            }
            for (Class<?> implInterfaces : scannedType.getInterfaces()) {
                queue.offer(implInterfaces);
            }
        }

        if (implementedBy != null) {
            return new ReflectionClassWrapper(implementedBy.value());
        }
        throw new RuntimeException("The class " + target.getName() + "has no @ImplementedBy annotation in its hierarchy!");
    }

}

Improve error message when searching for @ImplementedBy