ReflectionUtils.java

package fr.tse.fise2.info4.lab11;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Utilities for introspection
 * 
 * @author Julien Subercaze
 * 
 */
@SuppressWarnings("rawtypes")
public class ReflectionUtils {

	public static Set<Class> getClassesFromCollection(List<Object> collec) {
		Set<Class> clazzes = new HashSet<>();
		for (Object obj : collec) {
			clazzes.add(obj.getClass());
		}

		return clazzes;

		//@formatter:off
//		return collec
//				.stream()
//				.map(obj -> obj.getClass())
//				.collect(Collectors.toSet());
		//@formatter:on
	}

	/**
	 * 
	 * @param clazz
	 * @return TODO
	 */
	public static List<Field> listFields(Class clazz) {

		List<Field> myFields = new ArrayList<>();
		while (clazz != null) {
			Field[] fields = clazz.getDeclaredFields();
			for (Field field : fields) {
				myFields.add(field);
			}

			// @formatter:off
//			Arrays.asList(clazz.getDeclaredFields())
//				.stream()
//				.forEach(f -> myFields.add(f));
			// @formatter:on

			clazz = clazz.getSuperclass();
		}
		return myFields;
	}

	public static void main(String[] args) {
		Car c1 = new Car("peugeot", "205", "2E 234 42", 1997);
		Car c2 = new Car("citroen", "c4", "DF 2ZA 69", 2001);
		Plane p1 = new Plane("Airbus", "A320", "AF3456", 2004);
		Plane p2 = new Plane("Boeing", "B747", "DL345T56", 2006);

		List<Object> objects = new ArrayList<>();
		objects.add(c1);
		objects.add(c2);
		objects.add(p1);
		objects.add(p2);

		Set<Class> clazzes = ReflectionUtils.getClassesFromCollection(objects);
		for (Class cls : clazzes) {
			System.out.println("Class " + cls + " has fields : ");
			for (Field f : listFields(cls)) {
				System.out.println(f);
			}
		}

		// @formatter:off
		/*ReflectionUtils
			.getClassesFromCollection(objects)
			.stream()
			.forEach(cls -> {
				System.out.println("Class " + cls + " has fields : ");
				listFields(cls)
				.stream()
				.forEach(f -> System.out.println(f));
			});*/
		// @formatter:on
	}
}