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There is a newer version: 0.0.5

package jpower.event;

import jpower.core.Wrapper;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;

public class RegisteredHandler
{

    private final Object object;
    private final Collection methods = new ArrayList<>();
    private Class annotationType;

    public RegisteredHandler(Object object)
    {
        this.object = object;
    }

    public RegisteredHandler setAnnotationType(Class annotationType)
    {
        this.annotationType = annotationType;
        return this;
    }

    public RegisteredHandler registerMethods()
    {
        for (Method method : object.getClass().getMethods())
        {
            if (isEventMethod(method))
            {
                methods.add(new RegisteredMethod(method));
            }
        }
        return this;
    }

    public boolean isEventMethod(Method method)
    {
        return method.isAnnotationPresent(annotationType) && method.getParameterTypes().length == 1;
    }

    public boolean executeEvent(Object event)
    {
        Wrapper executed = new Wrapper<>(false);
        methods.forEach(method -> {
            if (method.getEventType().isAssignableFrom(event.getClass()))
            {
                method.invoke(object, event);
                executed.set(true);
            }
        });
        return executed.get();
    }

    public Object getObject()
    {
        return object;
    }

}