ObjectFieldUtils.java

package net.tooan.ynpay.commons;

import java.lang.reflect.Field;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Created with IntelliJ IDEA.
 * User: Jing
 * Date: 13-10-15
 * Time: 下午9:24
 */
public class ObjectFieldUtils {
    private static ConcurrentHashMap<Class<?>, Field[]> FIELD_CACHE_MAP = new ConcurrentHashMap<Class<?>, Field[]>();

    public static Field[] getAllField(Object object) {
        return getAllField(object.getClass());
    }

    public static Field[] getAllField(Class<?> clazz) {
        Field[] fields = FIELD_CACHE_MAP.get(clazz);
        if (fields == null) {
            synchronized (FIELD_CACHE_MAP) {
                if ((fields = FIELD_CACHE_MAP.get(clazz)) == null) {
                    Set<Field> fieldSet = new HashSet<Field>();
                    allField(clazz, fieldSet);
                    fields = fieldSet.toArray(new Field[fieldSet.size()]);
                    FIELD_CACHE_MAP.put(clazz, fields);
                }
            }
        }
        return fields;
    }

    private static void allField(Class<?> clazz, Set<Field> fields) {
        if (clazz == null) {
            return;
        }
        for (Field field : clazz.getDeclaredFields()) {
            fields.add(field);
        }
        allField(clazz.getSuperclass(), fields);
    }

    public static void fieldSetAccessible(final Field field) {
        if (!field.isAccessible()) {
            if (System.getSecurityManager() != null) {
                AccessController.doPrivileged(new PrivilegedAction<Object>() {
                    public Object run() {
                        field.setAccessible(true);
                        return null;
                    }
                });
            } else {
                field.setAccessible(true);
            }
        }
    }
}