org.simpleflatmapper.reflect.meta.AnnotationToPropertyUtil Maven / Gradle / Ivy

package org.simpleflatmapper.reflect.meta;


import org.simpleflatmapper.util.Consumer;
import org.simpleflatmapper.util.ProducerServiceLoader;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.ServiceLoader;

public final class AnnotationToPropertyUtil {

	private AnnotationToPropertyUtil() { }

	private static final AnnotationToPropertyService ANNOTATION_TO_PROPERTY_SERVICE = findAnnotationToProperty();

	private static AnnotationToPropertyService findAnnotationToProperty() {
		final ArrayList providers = new ArrayList();

		ProducerServiceLoader.produceFromServiceLoader(ServiceLoader.load(AnnotationToPropertyServiceProducer.class), new Consumer() {
			@Override
			public void accept(AnnotationToPropertyService t) {
				providers.add(t);
			}
		});
		return aggregateAnnotationToProperty(providers.toArray(new AnnotationToPropertyService[0]));
	}

	public static AnnotationToPropertyService getAnnotationToPropertyService() {
		return ANNOTATION_TO_PROPERTY_SERVICE;
	}

	private static AnnotationToPropertyService aggregateAnnotationToProperty(AnnotationToPropertyService[] registered) {
		if (registered.length == 0) {
			return new DefaultAnnotationToPropertyService();
		} else if (registered.length == 1) {
			return registered[0];
		} else {
			return new ArrayAnnotationToPropertyService(registered);
		}
	}

	private static class DefaultAnnotationToPropertyService implements AnnotationToPropertyService {
		@Override
		public void generateProperty(Annotation annotation, Consumer