abstractcrudaction.java

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package com.easyjf.web.tools;

import java.lang.reflect.Method;

import com.easyjf.dbo.EasyJDB;
import com.easyjf.util.CommUtil;
import com.easyjf.web.IWebAction;
import com.easyjf.web.Module;
import com.easyjf.web.Page;
import com.easyjf.web.WebForm;
/**
*
* <p>Title: 通过添删改查(CRUD)处理Action类</p>
* <p>Description: 处理普通数据表的添删改查(CRUD)处理的抽象类，用户只需继承该Action，并根据自身的情况实现其中的模板方法即可。</p>
* <p>Copyright: Copyright (c) 2006</p>
* <p>Company: www.easyjf.com</p>
* @author 蔡世友
* @version 1.0
*/
public abstract class AbstractCrudAction implements ICommCRUDAction, IWebAction {
private String command;
private static final String systemCommand="new,edit,add,update,del,list,query,";
public Page execute(WebForm form, Module module)throws Exception  {
	String method=CommUtil.null2String(form.get("easyJWebCommand"));
	this.command=method;
    Object beforeCheck=doBefore(form,module);	//模版方法
	if(beforeCheck!=null)
	{
		//如果Action执行前检查，返回Page则直接跳转
		if(beforeCheck.getClass()==Page.class)return (Page)beforeCheck;
	}	
	IActiveUser user=(IActiveUser)getCurrentUser(form);		
	Page forward=null;
	doInit(form,module);	
	if("new".equals(method))
	{	
		forward=module.findPage("edit");
	}
	else if("edit".equals(method))
	{
		
		forward=doEdit(form,module,user);
	}
	else if("add".equals(method))
	{
		forward=doAdd(form,module,user);
	}
	else if("update".equals(method))
	{
		forward=doUpdate(form,module,user);
	}
	else if("del".equals(method))
	{
		forward=doDel(form,module,user);
	}
	else if("".equals(method)|| "list".equals(method)||"query".equals(method))
	{
		forward=doQuery(form,module,user);
	}
	else//其它命令直接调用doCommand方法
	{
		Class[] paras=new Class[2];
		paras[0]=WebForm.class;
		paras[1]=Module.class;
		String cmd="do"+method.substring(0,1).toUpperCase()+method.substring(1);
		Method m=this.getClass().getMethod(cmd,paras);
		if(m!=null)
		{
			Object[] objs=new Object[2];
			objs[0]=form;
			objs[1]=module;
			Object ret=m.invoke(this,objs);
			if(ret instanceof Page)forward=(Page)ret;				
		}
		else	
			throw new Exception("方法名称不正确,在"+this.getClass()+"中找不到"+cmd+"方法!请确认您页面中的easyJWebCommand参数值是否正确!");		
		}
		//forward=doOtherAction(form,module);	
	doAfter(form,module);	
	return forward;	
	}

	public Page doAdd(WebForm form, Module module, IActiveUser user) {
		Page forward=null;
		Object obj=form2Obj(form);
		if(obj==null)
		{
			form.addResult("msg","无法创建要保存的对象，添加失败！");
			return module.findPage("edit");
		}
	    EasyJDB db=EasyJDB.getInstance();	    
	    if(db.add(obj))
	    {
	    	form.addResult("msg","数据添加成功！");
	    	forward=doQuery(form,module,user);
	    }
	    else
	    {
	    	form.addResult("msg","数据添加失败");	 
	    	forward=module.findPage("edit");
	    }	    
		return forward;
	}

	public Page doUpdate(WebForm form, Module module, IActiveUser user) {		
		Page forward=null;
		Object obj=form2Obj(form);
	    EasyJDB db=EasyJDB.getInstance();
	    if(db.update(obj))
	    {
	    	form.addResult("msg","数据修改成功！");
	    	forward=doQuery(form,module,user);
	    }
	    else
	    {
	    	form.addResult("msg","数据修改失败");	 
	    	forward=module.findPage("edit");
	    }	    
		return forward;
	}

	public Page doEdit(WebForm form, Module module, IActiveUser user) {		
		Page forward=null;
		Object obj=form2Obj(form);	  
	    if(obj!=null)
	    {
	    	CommUtil.Obj2Map(obj,form.getTextElement());
	    	forward=module.findPage("edit");
	    }
	    else
	    {
	    	form.addResult("msg","找不到数据！");	 
	    	forward=doQuery(form,module,user);
	    }	    
		return forward;
	}

	public Page doDel(WebForm form, Module module, IActiveUser user) {
		
		Object obj=form2Obj(form);
	    EasyJDB db=EasyJDB.getInstance();
	    if(db.del(obj))
	    {
	    	form.addResult("msg","数据删除成功！");	    	
	    }
	    else
	    {
	    	form.addResult("msg","数据修改失败");	
	    }	    
		return doQuery(form,module,user);
	}

	public Page doQuery(WebForm form, Module module, IActiveUser user) {		
		int currentPage=CommUtil.null2Int(form.get("page"));
		int pageSize=CommUtil.null2Int(form.get("pageSize"));
		if(currentPage<1)currentPage=1;
		if(pageSize<1)pageSize=15;
		IPageList pList=doQuery(form,currentPage,pageSize);//调用模板方法执行数据查询
		//保存查询结果
		if(pList!=null){
		form.addResult("list",pList.getResult());
		form.addResult("pages",new Integer(pList.getPages()));
		form.addResult("rows",new Integer(pList.getRowCount()));
		form.addResult("page",new Integer(pList.getCurrentPage()));
		form.addResult("gotoPageHTML",CommUtil.showPageHtml(pList.getCurrentPage(),pList.getPages()));
		}
		return module.findPage("list");
	}
	
public String getCommand() {
		return command;
	}
public void setCommand(String command) {
		this.command = command;
	}
public boolean isSystemCommand()
{
	boolean ret=false;
	if("".equals(this.command)||systemCommand.indexOf(this.command)>=0)ret=true;
	return ret;
}
public abstract IPageList doQuery(WebForm form,int currentPage,int pageSize);
public abstract void doInit(WebForm form,Module module);//初始化数据，如表单项及默认值等	
public abstract IActiveUser getCurrentUser(WebForm form);//取得用户
public abstract Object doBefore(WebForm form,Module module);//Action前置校验
public abstract void doAfter(WebForm form,Module module);//Action后置处理
public abstract Object form2Obj(WebForm form);//处理form中的数据并返回相应的obj
//public abstract  Page doOtherAction(WebForm form,Module module);//基本添删改查以外的Action
}