org.apache.xmlgraphics.image.loader.impl
Class PreloaderGIF

java.lang.Object
  org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader
      org.apache.xmlgraphics.image.loader.impl.PreloaderGIF

All Implemented Interfaces:

ImagePreloader

public class PreloaderGIF
extends AbstractImagePreloader

Image preloader for GIF images.

Field Summary

Fields inherited from interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader

DEFAULT_PRIORITY

Constructor Summary

PreloaderGIF()

Method Summary

ImageInfo

preloadImage(java.lang.String uri, javax.xml.transform.Source src, ImageContext context) "Preloads" an image, i.e.

Methods inherited from class org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader

getHeader, getPriority

Methods inherited from class java.lang.Object

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

Constructor Detail

PreloaderGIF

public PreloaderGIF()

Method Detail

preloadImage

public ImageInfo preloadImage(java.lang.String uri,
                              javax.xml.transform.Source src,
                              ImageContext context)
                       throws java.io.IOException

"Preloads" an image, i.e. indentifies whether the source image is supported by this implementation and determines the image's intrinsic size and possibly some additional information. The image is usually not fully loaded at this time to conserve memory. The method returns null if the image was not identified. An ImageException is only thrown if the image is identified but some error has happened while working on the file.

Parameters:

uri - the original (unresolved) URI of the image

src - a image source the image is loaded from

context - the context object that provides configuration information

Returns:

an image info object with the basic information about an image or null if the image is not supported by this implementation

Throws:

java.io.IOException - if an I/O error occurs while preloading the image