//package com.kupal.skypeCommand.util;
import java.lang.reflect.Field;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
/**
* @author Kupal 3kb
*/
public class ClassUtil {
/**
* Create new instance of specified class and type
*
* @param clazz of instance
* @param type of object
* @return new Class instance
*/
public static T getInstance(Class clazz) {
T t = null;
try {
t = clazz.newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return t;
}
/**
* Retrieving fields list of specified class
* If recursively is true, retrieving fields from all class hierarchy
*
* @param clazz where fields are searching
* @param recursively param
* @return list of fields
*/
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()]);
}
/**
* Retrieving fields list of specified class and which
* are annotated by incoming annotation class
* If recursively is true, retrieving fields from all class hierarchy
*
* @param clazz - where fields are searching
* @param annotationClass - specified annotation class
* @param recursively param
* @return list of annotated fields
*/
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()]);
}
}