package com.iqbon.spider.util;  

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

import java.util.Date;  

import org.apache.commons.beanutils.BeanUtils;  

import com.mongodb.BasicDBObject;

import com.mongodb.DBObject;  

public class BeanUtil {  

  /**

   * 把实体bean对象转换成DBObject

   * @param bean

   * @return

   * @throws IllegalArgumentException

   * @throws IllegalAccessException

   */

  public static <T> DBObject bean2DBObject(T bean) throws IllegalArgumentException,

      IllegalAccessException {

    if (bean == null) {

      return null;

    }

    DBObject dbObject = new BasicDBObject();

    // 获取对象对应类中的所有属性域

    Field[] fields = bean.getClass().getDeclaredFields();

    for (Field field : fields) {

      // 获取属性名

      String varName = field.getName();

      // 修改访问控制权限

      boolean accessFlag = field.isAccessible();

      if (!accessFlag) {

        field.setAccessible(true);

      }

      Object param = field.get(bean);

      if (param == null) {

        continue;

      } else if (param instanceof Integer) {//判断变量的类型

        int value = ((Integer) param).intValue();

        dbObject.put(varName, value);

      } else if (param instanceof String) {

        String value = (String) param;

        dbObject.put(varName, value);

      } else if (param instanceof Double) {

        double value = ((Double) param).doubleValue();

        dbObject.put(varName, value);

      } else if (param instanceof Float) {

        float value = ((Float) param).floatValue();

        dbObject.put(varName, value);

      } else if (param instanceof Long) {

        long value = ((Long) param).longValue();

        dbObject.put(varName, value);

      } else if (param instanceof Boolean) {

        boolean value = ((Boolean) param).booleanValue();

        dbObject.put(varName, value);

      } else if (param instanceof Date) {

        Date value = (Date) param;

        dbObject.put(varName, value);

      }

      // 恢复访问控制权限

      field.setAccessible(accessFlag);

    }

    return dbObject;

  }  

  /**

   * 把DBObject转换成bean对象

   * @param dbObject

   * @param bean

   * @return

   * @throws IllegalAccessException

   * @throws InvocationTargetException

   * @throws NoSuchMethodException

   */

  public static <T> T dbObject2Bean(DBObject dbObject, T bean) throws IllegalAccessException,

      InvocationTargetException, NoSuchMethodException {

    if (bean == null) {

      return null;

    }

    Field[] fields = bean.getClass().getDeclaredFields();

    for (Field field : fields) {

      String varName = field.getName();

      Object object = dbObject.get(varName);

      if (object != null) {

        BeanUtils.setProperty(bean, varName, object);

      }

    }

    return bean;

  }

}