org.foray.graphic.factory
Class GIFFactory

java.lang.Object
  org.foray.graphic.factory.GraphicFactory
      org.foray.graphic.factory.GIFFactory

public class GIFFactory
extends GraphicFactory

ImageReader object for GIF image type.

Author:

Pankaj Narula

Field Summary

protected static byte[]	GIF_HEADER_1 One possible set of header bytes at the beginning of a GIF file.
protected static byte[]	GIF_HEADER_2 One possible set of header bytes at the beginning of a GIF file.

Constructor Summary

GIFFactory(GraphicServer4a server)
Constructor.

Method Summary

GIFGraphic

attemptCreate(URL url, BufferedInputStream bis) Subclasses implement this method to try to create an appropriate Graphic instance.

Methods inherited from class org.foray.graphic.factory.GraphicFactory

getLogger, getServer, makeGraphic, maxBytesToVerify

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GIF_HEADER_1

protected static final byte[] GIF_HEADER_1

One possible set of header bytes at the beginning of a GIF file.

GIF_HEADER_2

protected static final byte[] GIF_HEADER_2

One possible set of header bytes at the beginning of a GIF file.

Constructor Detail

GIFFactory

public GIFFactory(GraphicServer4a server)

Constructor.

Parameters:

server - The parent graphic server.

Method Detail

attemptCreate

public GIFGraphic attemptCreate(URL url,
                                BufferedInputStream bis)
                         throws IOException

Description copied from class: GraphicFactory

Subclasses implement this method to try to create an appropriate Graphic instance. Note that this superclass handles the task of marking and resetting the input stream, so all the subclass needs to do is read the stream.

Specified by:

attemptCreate in class GraphicFactory

Parameters:

url - The URL which contains the graphic content.

bis - The reusable input stream containing the bytes from url.

Returns:

The newly-created Graphic instance, or null if this factory was unable to create such an instance.

Throws:

IOException - For IO errors.