package com.chinaot.web.servlet;

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 说明:<br>
 * 
 * @author 张纪豪
 * @version
 * Build Time Sep 13, 2009
 */
public class MyHttpServletRequest extends HttpServletRequestWrapper {

    protected Log log = LogFactory.getLog(getClass());
    private static final String ENCODED = "UTF-8",DECODE="ISO8859-1";
    
    public MyHttpServletRequest(HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getQueryString() {
        String queryString = super.getQueryString();
        if(queryString != null){
            try {
                return new String(queryString.getBytes(DECODE),ENCODED);
            } catch (UnsupportedEncodingException e) {
                log.info(e.getMessage(),e);
            }
        }
        return queryString;
    }

    @Override
    public String getParameter(String name) {
        String value = super.getParameter(name);
        if (value != null) {
            try {
                return new String(value.getBytes(DECODE), ENCODED);
            } catch (UnsupportedEncodingException e) {
                log.info(e.getMessage(),e);
            }
        }
        return value;
    }

    @SuppressWarnings("unchecked")
    @Override
    public Map getParameterMap() {
        Map<String, String[]> values = super.getParameterMap();
        Map<String, String[]> valuesMap = new HashMap<String, String[]>();
        Set<String> names = values.keySet();
        for (Iterator<String> iter = names.iterator(); iter.hasNext();) {
            String name=  iter.next();
            String[] v = values.get(name);
            if(v != null) {
                String[] valuesCopy = new String[v.length];
                for(int i = 0; i < v.length; i++) {
                    try {
                        valuesCopy[i] = new String(v[i].getBytes(DECODE), ENCODED);
                    } catch (UnsupportedEncodingException e) {
                        log.info(e.getMessage(),e);
                    }
                }
                valuesMap.put(name, valuesCopy);// 向新Map放入转码过的值
            }            
        }
        return valuesMap;// 返回是副本
    }

    @Override
    public String[] getParameterValues(String name) {
        String[] values = super.getParameterValues(name);
        if(values != null) {
            String[] valuesCopy = new String[values.length];//原数组是只读的，不能修改
            for(int i = 0; i < values.length; i++) {
                try {
                    valuesCopy[i] = new String(values[i].getBytes(DECODE), ENCODED);
                } catch (UnsupportedEncodingException e) {
                    log.info(e.getMessage(),e);
                }
            }
            return valuesCopy;
        }
        return values;
    }

    
}