// ===========================================================================
//	Input.java					   © 1996 Metrowerks Inc. All rights reserved.
// ===========================================================================
//
//   Created: 	1/17/97
//	 Author: 	Clinton Popetz
//
//	These two classes just implement a simple System.in stream using a
//	TextField

package com.mw.io;

import java.awt.*;
import java.io.*;
import java.lang.*;

public interface SystemInConstants {
	static final char	marker			= '\uFFFF';
	static final char	newLineChar 	= 0x000A;
	static final byte	newLine			= 0x0A;
	static final byte	cr				= 0x0D;
}	

public class SystemInput extends Frame implements SystemInConstants{

	static SystemInput sFrame; //no GC
	SettableStringInputStream stream;
	TextField field;
	
	public static void main(String [] argv)
	{
		if (sFrame == null)
			new SystemInput();
		else
			sFrame.toFront();
	}

	public Insets insets() {
		return new Insets (5, 5, 20, 5);
	}
	
	public 
	SystemInput()
	{
		super("System.in");
		sFrame = this;  //no GC

		stream = new SettableStringInputStream(this);
		System.in = stream;

		field = new TextField(30);
		add("North", new Label("System input should be entered here."));
		add("Center",field);
		pack();
		show();
	}

    public boolean handleEvent(Event e) {
    
		switch (e.id) {
		  case Event.KEY_PRESS:
		  
		  	// If we get a CMD-D, set a marker character in the buffer.
			if ((e.key == 'd' && (e.modifiers & Event.META_MASK) == Event.META_MASK) ||
				e.key == newLine || e.key == cr) {
				
				char theCharArray[] = new char[1];
				String theText = field.getText();
				
				// add the newline to the buffer if an enter or return was pressed
				if ( e.key != 'd') {
					theText += newLineChar;
				} else {
					// add the marker character to the buffer
					theText += marker;
				}

				stream.MoreData(theText);
				field.setText("");		    
		    }
		    return super.handleEvent(e);
		    
		  default:
		    return super.handleEvent(e);
		}
		
    }

	public void toFront()
	{
		super.toFront();
		field.requestFocus();
	}	
}


public class SettableStringInputStream extends InputStream implements SystemInConstants{

    protected String buffer = "";

    protected int pos;
	protected SystemInput mFrame;

	public SettableStringInputStream (SystemInput inNewFrame)
	{
		mFrame = inNewFrame;
	}
	
	public synchronized void MoreData(String data)
	{
		buffer += data;
		notify();
	}
	
    public synchronized int read() throws IOException
    {
    	try {	
	    	if (buffer.length() <= pos)
	    	{
	    		mFrame.toFront();
	    		wait();
	    	}

	    	char c = buffer.charAt(pos++);
	    	
	    	if (c == marker || pos == buffer.length()) //used up this string, reset it
	    	{	
	    		pos = 0;
	    		buffer = "";
	    	}

			// If we find the marker char in the buffer, return -1 for EOF.
	    	if (c == marker)
	    		return -1;
	    	else
		    	return c;
	  	}
	  	catch (InterruptedException e) {
	 		return -1;
	 	}
    }
}