batchcommand.java

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package ui;
import java.io.*;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.Calendar;
import logical.AgendaService;
import exception.IOAndFileException;
import exception.BadCommandException;
/**
 * 这个方法是批处理命令的类，实现命令的解析和执行，另外输出结果字符串
 * @author zouhao
 */
public class BatchCommand implements Command
{
    Scanner scanner;
    boolean success;
    Calendar cal;
    int year;
    AgendaService agenda;
    String filename;
    String command;
    BufferedReader fileinput ;
    Show show;
    /**
     * 命令的构造函数
     */
    BatchCommand()
    {
        agenda = AgendaService.getInstance();
        year=2008;
        success=false;
        cal=Calendar.getInstance();
        show=Show.getInstance();
    }
    /**
     * 解析命令方法，如果命令不符合语法规则，抛出异常
     * @param input 用于解析的命令输入字符串
     */
    public void parse(String input)
    {
        scanner = new Scanner(input);
        StringTokenizer tmp = new StringTokenizer(input);
        try{
            if(tmp.countTokens()!=2){throw new BadCommandException();}
            if(!scanner.next().equals("batch")){throw new BadCommandException();}    
            success = true;
        }
        catch (BadCommandException e){}
    }
    /**
     * 执行命令的方法，如果命令执行不成功，抛出异常
     * @return 返回成功与否
     */
    public boolean Execute(){
        if(success)
        {
            filename = scanner.next();
            try{
                    fileinput = new BufferedReader(new FileReader(filename));
                    command = fileinput.readLine();
                    while(command!=null)
                    {
                        System.out.println("Processing:"+command);
                        command.toLowerCase();
                        StringTokenizer stringtoken = new StringTokenizer(command);
                        String temp=stringtoken.nextToken();
                        Command com = CommandFactory.factory(temp);
                        if(com==null)
                        {
                            command = fileinput.readLine();
                            continue;
                        }
                        com.parse(command);
                        success = com.Execute();
                        if(success)
                        {
                            System.out.println("success to "+temp+"!");
                        }
                        else {System.out.println("Fail to "+temp+"!");}
                        show.ToShow(com.ToString());
                        command = fileinput.readLine();
                    }
                }
            catch (FileNotFoundException e){new IOAndFileException(e);}
            catch (IOException e){new IOAndFileException(e); }
            }
        return success;
    }
        
    
    /**
     * 打印方法
     * @return 结果字符串
     */
    public String ToString()
    {
        return "";
    }
}