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.
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 |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
PreloaderJPEG
public PreloaderJPEG()
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 imagesrc
- a image source the image is loaded fromcontext
- 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
Copyright 1999-2012 The Apache Software Foundation. All Rights Reserved.