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/* ImageDecoder.java --

   Copyright (C) 1999, 2000, 2004  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package gnu.java.awt.image;

import java.awt.image.ImageConsumer;

import java.awt.image.ImageProducer;

import java.io.ByteArrayInputStream;

import java.io.DataInput;

import java.io.EOFException;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.Vector;

public abstract class ImageDecoder implements ImageProducer

{

  Vector consumers = new Vector ();

  String filename;

  URL url;

  byte[] data;

  int offset;

  int length;

  InputStream input;

  DataInput datainput;

  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 ImageDecoder (InputStream is)

  {

    this.input = is;

  }

  public ImageDecoder (DataInput datainput)

  {

    this.datainput = datainput;

  }

  public ImageDecoder (byte[] imagedata, int imageoffset, int imagelength)

  {

    data = imagedata;

    offset = imageoffset;

    length = imagelength;

  }

  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)

  {

    if (!isConsumer(ic))

      addConsumer(ic);

    Vector list = (Vector) consumers.clone ();

    try

      {

        // Create the input stream here rather than in the

        // ImageDecoder constructors so that exceptions cause

        // imageComplete to be called with an appropriate error

        // status.

        if (input == null)

          {

            try

              {

                if (url != null)

                  input = url.openStream();

                else if (datainput != null)

                  input = new DataInputStreamWrapper(datainput);

                else

                  {

                    if (filename != null)

                      input = new FileInputStream (filename);

                    else

                      input = new ByteArrayInputStream (data, offset, length);

                  }

                produce (list, input);

              }

            finally

              {

                input = null;

              }

          }

        else

          {

            produce (list, input);

          }

      }

    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)

  {

  }

  public abstract void produce (Vector v, InputStream is) throws IOException;

  private static class DataInputStreamWrapper extends InputStream

  {

    private final DataInput datainput;

    DataInputStreamWrapper(DataInput datainput)

    {

      this.datainput = datainput;

    }

    public int read() throws IOException

    {

      try

        {

          return datainput.readByte() & 0xFF;

        }

      catch (EOFException eofe)

        {

          return -1;

        }

    }

  }

}