Class PreloaderJPEG
java.lang.Object
org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader
org.apache.xmlgraphics.image.loader.impl.PreloaderJPEG
- All Implemented Interfaces:
JPEGConstants
,ImagePreloader
Image preloader for JPEG images.
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Field Summary
Fields inherited from interface org.apache.xmlgraphics.image.loader.spi.ImagePreloader
DEFAULT_PRIORITY
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionpreloadImage
(String uri, Source src, ImageContext context) "Preloads" an image, i.e.Methods inherited from class org.apache.xmlgraphics.image.loader.impl.AbstractImagePreloader
getHeader, getPriority
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Constructor Details
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PreloaderJPEG
public PreloaderJPEG()
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Method Details
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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. AnImageException
is only thrown if the image is identified but some error has happened while working on the file.- Specified by:
preloadImage
in interfaceImagePreloader
- 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
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