application.java

ALGAE是一个快速创建算法演示的框架。目前支持的算法实现语言包括java和c

package edu.odu.cs.zeil.AlgAE;


import java.applet.Applet;
import java.util.Hashtable;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.Reader;
import java.io.Writer;
import java.io.InputStream;
import java.io.OutputStream;
import java.awt.Frame;

import edu.odu.cs.zeil.AlgAE.MessageIO;


/**
 *  Contains information specific to a single instance of a running
 *  application, whether that program is launched as an applet or as a
 *  standalone.
 *
 *  @author Steven J Zeil
 **/
public class Application
{
  public Applet applet;

  public Thread timerThread;
  public Thread dispatcherThread;
  public Thread msgReaderThread;

  public Messages msgs;
  public MessageIO msgIO;

  public Reader inReader;
  public Writer outWriter;
  public InputStream inStream;
  public OutputStream outStream;
  public Writer logStream;
  public Writer debugOut;

  public Frame dataWindow;
  
  private Frame dummyWindow;
    
  
  public Application ()
    {
      msgs = new Messages();
      
      applet = null;
      
      timerThread = null;
      dispatcherThread = null;
      msgReaderThread = null;

      msgIO = null;

      inReader = null;
      outWriter = null;
      inStream = null;
      outStream = null;
      logStream = null;
      debugOut = null;

      dataWindow = null;
      dummyWindow = null;
    }


  public Frame dialogParent()
    {
      if (dataWindow != null)
	return dataWindow;
      else
	{
	  if (dummyWindow == null)
	    dummyWindow = new Frame("AlgAE");
	  dummyWindow.setVisible (true);
	  return dummyWindow;
	}
    }
    

  public void dialogDone()
    {
      if (dummyWindow != null)
	dummyWindow.setVisible (false);
    }
  
  public void exit (int code)
    {
      if (timerThread != null)
	try 
	  {
	    timerThread.stop();
	  }
        catch (Throwable e) {}

      if (dispatcherThread != null)
	try 
	  {
	    dispatcherThread.stop();
	  }
        catch (Throwable e) {}

      if (msgReaderThread != null)
	try 
	  {
	    msgReaderThread.stop();
	  }
        catch (Throwable e) {}

      if (msgIO != null)
	try 
	  {
	    msgIO.close();
	  }
        catch (Throwable e) {}

      if (inReader != null)
	try 
	  {
	    inReader.close();
	  }
        catch (Throwable e) {}

      if (outWriter != null)
	try 
	  {
	    outWriter.close();
	  }
        catch (Throwable e) {}

      if (inStream != null)
	try 
	  {
	    inStream.close();
	  }
        catch (Throwable e) {}

      if (outStream != null)
	try 
	  {
	    outStream.close();
	  }
        catch (Throwable e) {}

      if (logStream != null)
	try 
	  {
	    logStream.close();
	  }
        catch (Throwable e) {}

      if (debugOut != null)
	try 
	  {
	    debugOut.close();
	  }
        catch (Throwable e) {}

      if (dataWindow != null)
	try 
	  {
	    dataWindow.setVisible(false);
	  }
        catch (Throwable e) {}

      if (dummyWindow != null)
	try 
	  {
	    dummyWindow.setVisible(false);
	  }
        catch (Throwable e) {}

      if (applet == null)
	{
	  System.exit (code);
	}
    }


  public boolean isAnApplet ()
    {
      return applet != null;
    }

  public static Hashtable parseCommandLine(String[] args)
    {
      Hashtable arguments = new Hashtable();
      for (int i = 0; i < args.length; i +=2)
	{
	  String param = args[i];
	  
	  if (param.charAt(0) == '@')
	    {
	      String extensionFileName = param.substring(1);
	      BufferedReader moreParameters = null;
	      try
		{
		  moreParameters =
		    new BufferedReader (new FileReader (extensionFileName));
		}
	      catch (java.io.FileNotFoundException e)
		{
		  System.out.println ("***Error: Could not open file "
				      + extensionFileName);
		  System.exit(-1);
		}
	      String paramName;
	      try {
		while ((paramName = moreParameters.readLine()) != null)
		  {
		    paramName = paramName.trim().toLowerCase();
		    if (paramName.length() > 0)
		      {
			String paramValue = moreParameters.readLine();
			if (paramValue == null)
			  {
			    System.out.println
			      ("***Error in " + extensionFileName
			       + ": no value for " + paramName);
			    System.exit (-1);
			  }
			arguments.put (paramName,
				       paramValue.trim());
		      }
		    
		  }
	      }
	      catch (java.io.IOException e)
		{
		  System.out.println
		    ("***Error in " + extensionFileName
		     + ": " + e);
		  System.exit (-1);
		}
	    }
	  else
	    {
	      if (param.charAt(0) == '-')
		param = param.substring(1);
	      arguments.put (param.toLowerCase(), args[i+1]);
	    }
	}
      return arguments;
    }
  
  
  public String toString()
    {
      return "Application: " + super.toString() + " msgs=" + msgs;
    }



}