/* ImageDecoder.java
   Copyright (C) 1999, 2000 Free Software Foundation, Inc.

This file is part of the non-peer AWT libraries of GNU Classpath.

This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published 
by the Free Software Foundation, either version 2 of the License, or
(at your option) any later verion.

This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Library General Public License for more details.

You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation
Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307 USA. */

package gnu.java.awt.image;

import java.awt.*;
import java.awt.image.*;
import java.util.*;
import java.io.*;
import java.net.URL;

public abstract class ImageDecoder implements ImageProducer 
{
  Vector consumers = new Vector ();
  String filename;
  URL url;

  public static ColorModel cm;

  static
  {
    // FIXME: there was some broken code here that looked like
    // it wanted to rely on this property.  I don't have any idea
    // what it was intended to do.
    // String endian = System.getProperties ().getProperty ("gnu.cpu.endian");
  }

  public ImageDecoder (String filename)
  {
    this.filename = filename;
  }

  public ImageDecoder (URL url)
  {
    this.url = url;
  }

  public void addConsumer (ImageConsumer ic) 
  {
    consumers.addElement (ic);
  }

  public boolean isConsumer (ImageConsumer ic)
  {
    return consumers.contains (ic);
  }
  
  public void removeConsumer (ImageConsumer ic)
  {
    consumers.removeElement (ic);
  }

  public void startProduction (ImageConsumer ic)
  {
    addConsumer (ic);
    Vector list = (Vector) consumers.clone ();
    try 
      {
	FileInputStream is = (url == null) ? new FileInputStream (filename) :
	                                  (FileInputStream) url.openStream();
						  
	produce (list, is);
      } 
    catch (Exception e)
      {
	for (int i = 0; i < list.size (); i++)
	  {
	    ImageConsumer ic2 = (ImageConsumer) list.elementAt (i);
	    ic2.imageComplete (ImageConsumer.IMAGEERROR);
	  }
      }
  }

  public void requestTopDownLeftRightResend (ImageConsumer ic) 
  { 
  }

  abstract void produce (Vector v, FileInputStream is) throws IOException;
}