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/**
 * Copyright (c) 2011-2014, L.cm ([email protected]).
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.baomidou.framework.common.util;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Map;

import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeansException;
import org.springframework.beans.FatalBeanException;
import org.springframework.cglib.beans.BeanCopier;
import org.springframework.cglib.beans.BeanMap;
import org.springframework.util.Assert;

/**
 * 
 * 基于CGlib，扩展BeanUtils，对于复杂类型的CGlib更有优势
 * 
 * 
 * @author L.cm
 * @date 2016-04-15
 */
public final class BeanUtil extends BeanUtils {

	protected BeanUtil() {
		/* 保护 */
	}

	/**
	 * 实例化对象
	 * 
	 * @param clazz
	 *            类
	 * @return 对象
	 */
	@SuppressWarnings("unchecked")
	public static  T newInstance(Class clazz) {
		try {
			return (T) clazz.newInstance();
		} catch (InstantiationException e) {
			throw new RuntimeException(e);
		} catch (IllegalAccessException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * 实例化对象
	 * 
	 * @param clazzStr
	 *            类名
	 * @return {T}
	 */
	public static  T newInstance(String clazzStr) {
		try {
			Class clazz = Class.forName(clazzStr);
			return newInstance(clazz);
		} catch (ClassNotFoundException e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 * copy 对象属性到另一个对象，默认不使用Convert
	 * 
	 * @param src
	 * @param clazz
	 *            类名
	 * @return {T}
	 */
	public static  T clone(Object src, Class clazz) {
		BeanCopier copier = BeanCopier.create(src.getClass(), clazz, false);
		T to = newInstance(clazz);
		copier.copy(src, to, null);
		return to;
	}

	/**
	 * 拷贝对象
	 * 
	 * @param source
	 *            源对象
	 * @param target
	 *            需要赋值的对象
	 */
	public static void copy(Object source, Object target) throws BeansException {
		Assert.notNull(source, "Source must not be null");
		Assert.notNull(target, "Target must not be null");
		Class actualEditable = target.getClass();
		PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);
		for (PropertyDescriptor targetPd : targetPds) {
			if (targetPd.getWriteMethod() != null) {
				PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
				if (sourcePd != null && sourcePd.getReadMethod() != null) {
					try {
						Method readMethod = sourcePd.getReadMethod();
						if (!Modifier.isPublic(readMethod.getDeclaringClass().getModifiers())) {
							readMethod.setAccessible(true);
						}
						/*
						 * no copy null properties
						 */
						Object value = readMethod.invoke(source);
						if (value != null) {
							Method writeMethod = targetPd.getWriteMethod();
							if (!Modifier.isPublic(writeMethod.getDeclaringClass().getModifiers())) {
								writeMethod.setAccessible(true);
							}
							writeMethod.invoke(target, value);
						}
					} catch (Throwable ex) {
						throw new FatalBeanException("Could not copy properties from source to target", ex);
					}
				}
			}
		}
	}

	/**
	 * 将对象装成map形式 注意：生成的是unmodifiableMap
	 * 
	 * @param src
	 *            源对象
	 * @return {Map}
	 */
	@SuppressWarnings("unchecked")
	public static  Map toMap(Object src) {
		return BeanMap.create(src);
	}

}