Class ImageHandlerRegistry

java.lang.Object
org.apache.fop.render.ImageHandlerRegistry
public class ImageHandlerRegistry extends Object
This class holds references to various image handlers. It also supports automatic discovery of additional handlers available through the class path.

  • Field Details

    • log

      private static org.apache.commons.logging.Log log
      the logger

    • HANDLER_COMPARATOR

      private static final Comparator<ImageHandler> HANDLER_COMPARATOR

    • handlers

      private Map<Class<? extends org.apache.xmlgraphics.image.loader.Image>, ImageHandler> handlers
      Map containing image handlers for various Image subclasses.

    • handlerList

      private List<ImageHandler> handlerList
      List containing the same handlers as above but ordered by priority

    • handlerRegistrations

      private int handlerRegistrations

  • Constructor Details

    • ImageHandlerRegistry

      public ImageHandlerRegistry()
      Default constructor.

  • Method Details

    • addHandler

      public void addHandler(String classname)
      Add an PDFImageHandler. The handler itself is inspected to find out what it supports.
      Parameters:
      classname - the fully qualified class name

    • 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

    • getHandler

      public ImageHandler getHandler(RenderingContext targetContext, org.apache.xmlgraphics.image.loader.Image image)
      Returns an ImageHandler which handles an specific image type given the MIME type of the image.
      Parameters:
      targetContext - the target rendering context that is used for identifying compatibility
      image - the Image to be handled
      Returns:
      the image handler responsible for handling the image or null if none is available

    • getSupportedFlavors

      public org.apache.xmlgraphics.image.loader.ImageFlavor[] getSupportedFlavors(RenderingContext context, org.apache.xmlgraphics.image.loader.Image image)
      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

    • discoverHandlers

      private void discoverHandlers()
      Discovers ImageHandler implementations through the classpath and dynamically registers them.