helpmode.java

超级多项式计算器

import java.io.*;
import java.util.Vector;

/**Class HelpMode<br/>
  *This class to run the HelpMode,contains sevaral commands :<br/>
  *list  -- to see the command list<br/>
  *help  -- to see the help document<br/>
  *func  -- to see the Functions that have been defined<br/>
  *done  -- to see the polynomials that have been calculated<br/>
  *info  -- to see the program's information
  *close -- close the HelpMode to the original mode<br/>
  *Also this class contians a read method to read these methods and to judge if the input
  *command if legal.
  */
 
public final class HelpMode
{
	private static Vector functionList = new Vector();
	private static Vector calculated = new Vector();
	private static BufferedReader d;
	
	private static final String INFORMATION =
	"*-----------------------*-多项式计算器-*----------------------*\n\n" + 
	"                      版本 : Pcalc 1.0\n" + 
	"                      作者 : zhlmmc\n" + 
	"                      信箱 : [e-mail]\n" + 
	"                      *************************\n" + 
	"                      * This software is FREE *\n" + 
	"                      * Copyright @ zhlmmc    *\n" + 
	"                      * All Rights Reserved   *\n" + 
	"                      *************************\n\n";
	private static final String COMMANDS = 
	"*-------*-命令表-*-------*\n" + 
	"list  -- 查看命令表\n" + 
	"help  -- 查看帮助文档\n" + 
	"func  -- 查看已经定义过的函数\n" + 
	"done  -- 查看已经计算过的多项式\n" + 
	"info  -- 查看软件信息\n" +
	"close -- 退出帮助模式\n\n";

	/**This method is to read the command in the HelpMode
	  *and judge if the command is legal.
	  */
	public static void read()
	{

		//print the welcome information
		System.out.println(
		"*************************************************************************\n" + 
		"**************************欢 迎 进 入 帮 助 模 式************************\n" +
		"*************************************************************************\n\n");

		System.out.println(COMMANDS);
		//declear the reader and the StreamReaderBuffer
		InputStreamReader cin = new InputStreamReader(System.in);
		BufferedReader bf = new BufferedReader(cin);

		String s = "";//string to recive the polynomial
		
		//this block is to do the read task
		
		do
		{
			
			try
			{
				
				System.out.print("请输入命令 ：");
				s = "";
				s += bf.readLine();
				if ((s.equals("help")) || (s.equals("func")) || (s.equals("done")) 
					|| (s.equals("info")) || (s.equals("list"))) 
				{
					dealCommands(s);
				}
				else if ( s.equals("close"))
				{
					System.out.println();
					break;
				}
				else 
				{
					System.out.println("对不起，您输入的命令错误！");
				}
			}catch(IOException e)
			{
				System.out.println("Wrong!");
			}
		}while(true);
		
	}

	/*this method is to deal the command
	 */
	private static void dealCommands(String cmd)
	{
		
		if (cmd.equals("help"))
			help();
		else if (cmd.equals("list"))
		{
			System.out.println(COMMANDS);
		}
		else if (cmd.equals("func"))
		{
			func();
		}
		else if (cmd.equals("done"))
		{
			done();
		}
		else if (cmd.equals("info"))
		{
			System.out.println(INFORMATION);
		}
		
	}

	/**this method is to deal the func command
	  */
	private static void func()
	{
		
		if (functionList.size() == 0)
		{
			System.out.println("对不起，暂时还没有自定义函数！\n");
			return;
		}
		System.out.println("*------------*-已经定义的函数-*-------------*");
		for (int i = 0;i < functionList.size() ;i++ )
		{
			System.out.println((i+1)+") " + functionList.get(i));
		}
		System.out.println();
	}
	
	/**this method is to deal the done command
	  */
	private static void done()
	{
		
		if (calculated.size() == 0)
		{
			System.out.println("对不起，暂时还没有计算过任何多项式！\n");
			return;
		}

		System.out.println("*----------*-已经计算过的多项式-*-----------*");
		for (int i = 0;i < calculated.size() ;i++ )
		{
			System.out.println((i+1)+") " + calculated.get(i));
		}
		System.out.println();
	}

	/**this method is to deal the help command
	  */
	private static void help()
	{
		

		String temp = "";
		try
		{
			d = new BufferedReader(new InputStreamReader(new FileInputStream("help.txt")));
		}
		catch (IOException e)
		{
			System.out.println("ERROR :File not found!");
			System.exit(1);
		}
			
		while (true)
		{
			
			try
			{
				temp = d.readLine();
				if (temp != null)
				{
					System.out.println(temp);
				}
				else break;
			}
			catch (EOFException eof)
			{
				break;
			}
			catch (IOException e)
			{
				break;
			}
		}
		
		try
		{
			d.close();
		}
		catch (IOException e)
		{
		}
	}

	/**This method is to update the functions 
	  *@param functions the newest functions 
	  */
	public static void setFunctions(Vector functions)
	{
		functionList = functions;
	}

	/**This method is to add the calculated polynomials
	  *@param expression the current polynoimal
	  */
	public static void addCalculated(String expression)
	{
		calculated.add(expression);
	}

};