querycommand.java

来自「Java编写个人日程管理工具, 具有添加编辑日程和自动适应功能, 程序包含完整的」· Java 代码 · 共 87 行

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package ui;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.Calendar;
import java.util.Date;
import java.util.ArrayList;
import logical.AgendaService;
import logical.Meeting;
import exception.BadCommandException;
/**
 * 这个方法是查询命令的类，实现命令的解析和执行，另外输出结果字符串
 * @author zouhao
 */
public class QueryCommand extends UserCommand{
    Calendar cal;
    int year;
    Show show;
    /**
     * 命令的构造函数
     */
    QueryCommand()
    {
        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()!=5){throw new BadCommandException();}
            if(!scanner.next().equals("query")){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)
        {
            username = scanner.next();
            password = scanner.next();
            StringTokenizer tmp = new StringTokenizer(scanner.next(),"-",false);
            cal.set(year, Integer.parseInt(tmp.nextToken())-1, Integer.parseInt(tmp.nextToken()),
                    Integer.parseInt(tmp.nextToken()), Integer.parseInt(tmp.nextToken()));
            Date ts = cal.getTime();
            tmp = new StringTokenizer(scanner.next(),"-",false);
            cal.set(year, Integer.parseInt(tmp.nextToken())-1, Integer.parseInt(tmp.nextToken()), 
                    Integer.parseInt(tmp.nextToken()), Integer.parseInt(tmp.nextToken()));
            Date te = cal.getTime();
            ArrayList<Meeting> temp = agenda.Query(username, password, ts, te);
            if(temp!=null)
            {
                int s = temp.size();
                int i;
                for(i=0;i<s;i++)
                {
                    show.ToShow(temp.get(i).ToString());
                }
            } else success = false;
        }
        return success;
    }
    /**
     * 打印方法
     * @return 结果字符串
     */
    public String ToString()
    {
        return agenda.ToString("");
    }
}