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

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

All Implemented Interfaces:

JPEGConstants, ImagePreloader

public class PreloaderJPEG
extends AbstractImagePreloader
implements JPEGConstants

Image preloader for JPEG images.

Field Summary

Fields inherited from interface org.apache.xmlgraphics.image.loader.impl.JPEGConstants

APP0, APP2, APPE, APPF, EOI, MARK, NULL, SOF0, SOF1, SOF2, SOFA, SOI, SOS

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

DEFAULT_PRIORITY

Constructor Summary

PreloaderJPEG()

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

PreloaderJPEG

public PreloaderJPEG()

Method Detail

preloadImage

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

"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.

Specified by:

preloadImage in interface ImagePreloader

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

Throws:

ImageException

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