Package org.apache.fop.render
Class ImageHandlerRegistry
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- org.apache.fop.render.ImageHandlerRegistry
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public class ImageHandlerRegistry extends java.lang.Object
This class holds references to various image handlers. It also supports automatic discovery of additional handlers available through the class path.
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Field Summary
Fields Modifier and Type Field Description private static java.util.Comparator<ImageHandler>
HANDLER_COMPARATOR
private java.util.List<ImageHandler>
handlerList
List containing the same handlers as above but ordered by priorityprivate int
handlerRegistrations
private java.util.Map<java.lang.Class<? extends org.apache.xmlgraphics.image.loader.Image>,ImageHandler>
handlers
Map containing image handlers for variousImage
subclasses.private static org.apache.commons.logging.Log
log
the logger
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Constructor Summary
Constructors Constructor Description ImageHandlerRegistry()
Default constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addHandler(java.lang.String classname)
Add an PDFImageHandler.void
addHandler(ImageHandler handler)
Add an image handler.private void
discoverHandlers()
Discovers ImageHandler implementations through the classpath and dynamically registers them.ImageHandler
getHandler(RenderingContext targetContext, org.apache.xmlgraphics.image.loader.Image image)
Returns anImageHandler
which handles an specific image type given the MIME type of the image.org.apache.xmlgraphics.image.loader.ImageFlavor[]
getSupportedFlavors(RenderingContext context)
Returns the ordered array of supported image flavors.
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Field Detail
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log
private static org.apache.commons.logging.Log log
the logger
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HANDLER_COMPARATOR
private static final java.util.Comparator<ImageHandler> HANDLER_COMPARATOR
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handlers
private java.util.Map<java.lang.Class<? extends org.apache.xmlgraphics.image.loader.Image>,ImageHandler> handlers
Map containing image handlers for variousImage
subclasses.
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handlerList
private java.util.List<ImageHandler> handlerList
List containing the same handlers as above but ordered by priority
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handlerRegistrations
private int handlerRegistrations
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Method Detail
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addHandler
public void addHandler(java.lang.String classname)
Add an PDFImageHandler. The handler itself is inspected to find out what it supports.- Parameters:
classname
- the fully qualified class name
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addHandler
public void addHandler(ImageHandler handler)
Add an image handler. The handler itself is inspected to find out what it supports.- Parameters:
handler
- the ImageHandler instance
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getHandler
public ImageHandler getHandler(RenderingContext targetContext, org.apache.xmlgraphics.image.loader.Image image)
Returns anImageHandler
which handles an specific image type given the MIME type of the image.- Parameters:
targetContext
- the target rendering context that is used for identifying compatibilityimage
- the Image to be handled- Returns:
- the image handler responsible for handling the image or null if none is available
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getSupportedFlavors
public org.apache.xmlgraphics.image.loader.ImageFlavor[] getSupportedFlavors(RenderingContext context)
Returns the ordered array of supported image flavors. The array needs to be ordered by priority so the image loader framework can return the preferred image type.- Parameters:
context
- the rendering context- Returns:
- the array of image flavors
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discoverHandlers
private void discoverHandlers()
Discovers ImageHandler implementations through the classpath and dynamically registers them.
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