/*
 *  File:  ReadConnection.java
 *
 *  Read a file on the server using the URLConnection class
 *
 *  Copyright:  Northeast Parallel Architectures Center
 *  
 */

import java.applet.Applet;
import java.awt.*;
import java.net.URL;
import java.net.URLConnection;
import java.net.MalformedURLException;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;

public class ReadConnection extends Applet implements Runnable {

  URL url;
  Thread thread;
  TextArea textarea = new TextArea( "Read Text..." );

  public void init() {
    try { 
      url = new URL( getCodeBase(), "ReadConnection.java" ); 
    } catch ( MalformedURLException e ) {
      System.err.println( "Bad URL: " + url.toString() );
    }
    setLayout( new BorderLayout() );
    textarea.setFont( new Font( "Monospaced", Font.BOLD, 14 ) );
    add( textarea, BorderLayout.CENTER );
  }

  public void start() {
    if ( thread == null ) {
      thread = new Thread( this );
      thread.start();
    }
  }

  public void stop() {
    if ( thread != null ) {
      thread.stop();
      thread = null;
    }
  }

  public void run() {
    String line;
    StringBuffer buf = new StringBuffer();
    try { 
      URLConnection conn = url.openConnection();
      textarea.setText( "Opening connection..." );
      conn.connect();
      
      BufferedReader data = 
        new BufferedReader(
          new InputStreamReader( conn.getInputStream() ) );
      
      textarea.setText( "Reading data..." );
      while ( ( line = data.readLine() ) != null ) {
        buf.append( line + "\n" );
      }
      data.close();
      
      textarea.setText( buf.toString() );
    } catch ( IOException e ) {
    
      textarea.setText( "ReadConnection failed!" );
      System.err.println( "I/O Error:" + e.getMessage() );
      
    }
  }
  
} // end ReadConnection class