package com.easyjf.web.tools;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.context.Context;

import com.easyjf.util.CommUtil;
import com.easyjf.util.HtmlUtil;
import com.easyjf.web.WebForm;

import java.beans.PropertyDescriptor;
/**
*
* <p>Title: EasyJWeb內鉗通用工具集</p>
* <p>Description: </p>
* 
* <p>Copyright: Copyright (c) 2006</p>
* <p>Company: EasyJF開源團隊</p>
* @author 大峽
* @version 1.0
*/
public class CommTool {
	/**
	 * 復制一個iterator，可以在不同的classType之間復制
	 * @param classType iteratro中的類
	 * @param src 復制源
	 * @return
	 */
	public static Iterator CopyIterator(Class classType, Iterator src) {
		return CopyList(classType, src).iterator();
	}
	/**
	 * 采用copy屬性的方式復制一個list，可以在不同的class之間復制
	 * @param classType list中的類
	 * @param src 復制源
	 * @return
	 */
	public static List CopyList(Class classType, Iterator src) {
		List tag = new ArrayList();
		while (src.hasNext()) {
			Object obj = null, ormObj = src.next();
			try {
				obj = classType.newInstance();
				BeanUtils.copyProperties(obj, ormObj);
			} catch (Exception e) {
			}
			if (obj != null)
				tag.add(obj);
		}
		return tag;
	}

	/**
	 * 把map對象轉換成obj，即把map中的key當成obj的屬性，只轉換兩者完全相同的屬性
	 * @param map
	 * @param obj
	 */
	public static void Map2Obj(Map map, Object obj) {
		Iterator names = map.keySet().iterator();
		while (names.hasNext()) {
			String name = (String) names.next();
			if (BeanUtilsBean.getInstance().getPropertyUtils().isWriteable(obj,
					name)) {
				Object value = map.get(name);
				try {
					BeanUtilsBean.getInstance().copyProperty(obj, name, value);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * 把obj的屬性轉換成map,執行該操作將把obj.getXX轉換成map.get("XX")
	 * @param obj
	 * @param map
	 */
	public static void Obj2Map(Object obj, Map map) {
		if (map == null)
			map = new java.util.HashMap();
		PropertyDescriptor descriptors[] = BeanUtilsBean.getInstance()
				.getPropertyUtils().getPropertyDescriptors(obj);		
		for (int i = 0; i < descriptors.length; i++) {
			String name = descriptors[i].getName();
			try {
				if (descriptors[i].getReadMethod() != null) {
					map.put(name, BeanUtilsBean.getInstance()
							.getPropertyUtils().getProperty(obj, name));
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

	/**
	 * EasyJWeb調用
	 * @param form
	 * @return
	 */
	public static Context createContext(WebForm form) {
		Map result = form.getEasyJWebResult();
		Context context = new VelocityContext();
		Iterator it = result.keySet().iterator();
		while (it.hasNext()) {
			String name = (String) it.next();
			context.put(name, result.get(name));
			// logger.debug("Context:"+name+"="+result.get(name));
			createUtilContext(context);
		}
		return context;
	}

	public static void createUtilContext(Context context) {
		context.put("HtmlUtil", HtmlUtil.getInstance());
		context.put("CommUtil", CommUtil.getInstance());
	}
}