commandmap.java

基于Java的软件信息系统－项目管理

package core;

import cmd.*;
import java.util.*;
import java.io.*;

public class CommandMap
{
    //        private static String commandPath = "C:\\Documents and Settings\\rburke\\My Documents\\courses\\win03\\is313\\hwk\\hwk3\\solution\\cmd";
    //        private static String commandPath = "C:\\Documents and Settings\\rburke\\My Documents\\courses\\w03\\hwk\\hwk3\\solution\\cmd";
            private static String localCommandPath = "\\cmd";
    //    private static final String localCommandPath = "../cmd";
    protected Map m_commandMap = new HashMap ();

    public CommandMap ()
     {
         List commands  = new ArrayList ();
         String commandPath = db.DBUtilities.rootPath() + localCommandPath;
         File cmdDir = new File (commandPath);
         if (!cmdDir.exists())
         {
             System.err.println ("Command Directory " + commandPath + " does not exist.");
         }
         else
         {
             String [] classFiles = cmdDir.list(new FilenameFilter ()
                 {
                     public boolean accept (File file, String name)
                     {
                         return (name.endsWith (".class"));
                     }
                 });
             for (int i = 0; i < classFiles.length; i++)
             {
                 String classFilename = classFiles[i];
                 String className = classFilename.substring (0, 
                     classFilename.indexOf (".class"));
                 try
                 {
                     Class cmdClass = Class.forName ("cmd." + className);
                     //                     System.out.println ("Creating command: " + className);
                     commands.add (cmdClass.newInstance ());
                 } catch (ClassNotFoundException e)
                 {
                     System.err.println ("Couldn't find class: " + className);
                 } catch (InstantiationException e)
                 {
                     System.err.println ("Couldn't instantiate class: " + className);
                 } catch (IllegalAccessException e)
                 {
                     System.err.println ("Couldn't instantiate class: " + className);
                 }
             }
         }
         commands.add (new ExitCommand());
         commands.add (new HelpCommand()); 

         for (Iterator iter = commands.iterator ();
              iter.hasNext(); )
         {
             Command cmd = (Command) iter.next();
             m_commandMap.put (cmd.getName().toLowerCase(), cmd);
         }
         HelpCommand.setCommands (this);
     }
    public Collection names ()
    {
        return m_commandMap.keySet();
    }
    public Collection values ()
    {
        return m_commandMap.values();
    }

    public Command createCommand (String commandName, List parameters)
    {
	Command cmd = instantiateCmd (commandName);
	if (parameters != null)
	    cmd.setParameters (parameters);
	return cmd;
    }
    public Command createTextCommand (String commandName, 
                                  List parameters)
    {
	Command cmd = createCommand (commandName, parameters);
	cmd.setTextMode ();
	return cmd;
    }
    
    public Command createGUICommand (String commandName,
				     javax.swing.JFrame frm,
				     List parameters)
    {
	Command cmd = createCommand (commandName, parameters);
	cmd.setGUIMode (frm);
	return cmd;
    }

    private Command instantiateCmd (String commandName)
    {
	Command cmd = (Command) m_commandMap.get(commandName.toLowerCase());
	if (cmd == null)
	    cmd = (Command) m_commandMap.get("_unknown");
	return cmd.makeInstance();
    }
}