/*
 * Created on 2004-2-19 By Liudong
 */
package jdlog.util.tags;

import java.lang.reflect.Constructor;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * 用戶處于請(qǐng)求參數(shù)的標(biāo)簽庫(直接生成指定類型的變量)
 * @author Liudong
 */
public class HttpParamTag extends TagSupport {
    
    String id = null;						//變量名稱
    String type = String.class.getName();	//參數(shù)類型(默認(rèn)是字符串類型)
    String name = null;						//參數(shù)名
    String value = null;					//如果沒有指定參數(shù)則使用該缺省值,該類型必須具有一個(gè)帶一個(gè)字符串參數(shù)的構(gòu)造子

    public int doStartTag() throws JspException {
        try {
            Class cls = Class.forName(type);
            Constructor con = cls.getConstructor(new Class[] {String.class});
            String paramValue = pageContext.getRequest().getParameter(name);
            if(paramValue==null)
                paramValue = value;
            Object obj = con.newInstance(new Object[] {paramValue});
            pageContext.setAttribute(id, obj);
        }catch(Exception e) {
            throw new JspException(e);
        }
        return SKIP_BODY;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getValue() {
        return value;
    }
    public void setValue(String value) {
        this.value = value;
    }
}