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package io.pelle.mango.db.util;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

public class ClassUtils {

	public static Field getDeclaredFieldsByName(Class clazz, String fieldName, boolean recursively) {
		for (Field field : getDeclaredFields(clazz, recursively)) {
			if (field.getName().equals(fieldName)) {
				return field;
			}
		}

		throw new RuntimeException(String.format("field '%s' not found in class '%s'", fieldName, clazz.getName()));
	}

	public static Field[] getDeclaredFields(Class clazz, boolean recursively) {

		List fields = new LinkedList();
		Field[] declaredFields = clazz.getDeclaredFields();
		Collections.addAll(fields, declaredFields);

		Class superClass = clazz.getSuperclass();

		if (superClass != null && recursively) {
			Field[] declaredFieldsOfSuper = getDeclaredFields(superClass, recursively);
			if (declaredFieldsOfSuper.length > 0)
				Collections.addAll(fields, declaredFieldsOfSuper);
		}

		return fields.toArray(new Field[fields.size()]);
	}

	public static Field[] getAnnotatedDeclaredFields(Class clazz, Class annotationClass, boolean recursively) {
		Field[] allFields = getDeclaredFields(clazz, recursively);
		List annotatedFields = new LinkedList();

		for (Field field : allFields) {
			if (field.isAnnotationPresent(annotationClass))
				annotatedFields.add(field);
		}

		return annotatedFields.toArray(new Field[annotatedFields.size()]);
	}
}