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## 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, APP1, APP2, APPD, 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(String uri, 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(String uri,
                                  Source src,
                                  ImageContext context)
                           throws 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. 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.

  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 or null if the image is not supported by this implementation
  Throws:
    `ImageException`
    `IOException` - if an I/O error occurs while preloading the image

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