io.vertx.up.uca.web.origin.PluginInquirer Maven / Gradle / Ivy

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package io.vertx.up.uca.web.origin;

import io.reactivex.Observable;
import io.vertx.up.annotations.Plugin;

import java.lang.reflect.Field;
import java.util.HashSet;
import java.util.Set;

public class PluginInquirer implements Inquirer>> {

    @Override
    public Set> scan(final Set> allClasses) {
        final Set> plugins = new HashSet<>();
        // Filter Client
        Observable.fromIterable(allClasses)
                .filter(this::isPlugin)
                .subscribe(plugins::add)
                .dispose();
        // Ensure Tp Client
        return plugins;
    }

    private boolean isPlugin(final Class clazz) {
        final Field[] fields = clazz.getDeclaredFields();
        final Long counter = Observable.fromArray(fields)
                .filter(field -> field.isAnnotationPresent(Plugin.class))
                .count().blockingGet();
        return 0 < counter;
    }
}