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package com.yuweix.kuafu.sequence.utils;
import java.lang.ref.SoftReference;
import java.lang.reflect.Field;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
/**
* @author yuwei
*/
public abstract class FieldUtil {
private static SoftReference>> FIELD_REF;
private static final Object fieldLock = new Object();
private static Map> getFieldMap() {
Map> map = null;
if (FIELD_REF == null || (map = FIELD_REF.get()) == null) {
synchronized (fieldLock) {
if (FIELD_REF == null || (map = FIELD_REF.get()) == null) {
map = new ConcurrentHashMap<>();
FIELD_REF = new SoftReference<>(map);
}
}
}
return map;
}
public static List getAllFieldsList(Class clz) {
String className = clz.getName();
Map> map = getFieldMap();
List fList = map.get(className);
if (fList == null) {
fList = getAllFieldsList0(clz);
map.put(className, fList);
}
return fList;
}
/**
* Gets all fields of the given class and its parents (if any).
* @return
*/
private static List getAllFieldsList0(Class clz) {
final List allFields = new ArrayList<>();
Class currentClass = clz;
while (currentClass != null) {
allFields.addAll(Arrays.asList(currentClass.getDeclaredFields()));
currentClass = currentClass.getSuperclass();
}
return allFields;
}
}