import java.awt.image.*;
import java.awt.*;
import java.net.*;


// This class fetches an image from an URL, and processes it
class ImageFetcher implements ImageObserver {

  Preferences prefs;

  ImageFetcher(Preferences pprefs) {
	
    prefs = pprefs;

    // This creates a new URL
    URL url = null;
    try {
      url = new URL(prefs.urlString);
    }
		
    catch (Exception e) {
      Image2HTML.ErrorExit("Unable to parse url " + url);
    }
    
    Image image = null;
    try {
      image = Toolkit.getDefaultToolkit().getImage(url);
    }

    catch (Exception e) {
      Image2HTML.ErrorExit("Unable to parse url " + url);
    }

    Toolkit.getDefaultToolkit().prepareImage(image, -1, -1, this);
    
  }  // ImageFetcher constructor


  // This is called when the image is updated
  public boolean imageUpdate(Image image, int infoflags, int x, int y, int width, int height) {

    // If an error occurred, report it
    if ((infoflags & ERROR) != 0)
      Image2HTML.ErrorExit("Unable to read image from " + prefs.urlString + "; please verify that this is really the URL of an image (GIF or JPEG) file.");

    // If we're done reading this image, process it
    if ((infoflags & ALLBITS) != 0) {

      // If this is CGI mode, report the image size
      if (prefs.cgi) {
	System.out.println("IMAGE_HEIGHT: " + height);
	System.out.println("IMAGE_WIDTH: " + width);
      }

      // Process the image (generate the HTML table)
      ImageProcessor imageProcessor = new ImageProcessor(image, width, height, prefs);
      imageProcessor.start();

    }  // if done reading image

    return true;

  }  //==== imageUpdate() ====//


}  // class ImageFetcher