Class DeferRable

java.lang.Object
org.apache.batik.ext.awt.image.renderable.DeferRable
All Implemented Interfaces:
RenderableImage, Filter
public class DeferRable extends Object implements Filter
This class allows for the return of a proxy object quickly, while a heavy weight object is constrcuted in a background Thread. This proxy object will then block if any methods are called on it that require talking to the source object. This is actually a particular instance of a very general pattern this is probably best represented using the Proxy class in the Reflection APIs.
Version:
$Id$

  • Field Details

  • Constructor Details

    • DeferRable

      public DeferRable()
      Constructor takes nothing

  • Method Details

    • getSource

      public Filter getSource()
      Key method that blocks if the src has not yet been provided.

    • setSource

      public void setSource(Filter src)
      Key method that sets the src. The source can only be set once (this makes sense given the intent of the class is to stand in for a real object, so swaping that object isn't a good idea. This will wake all the threads that might be waiting for the source to be set.

    • setBounds

      public void setBounds(Rectangle2D bounds)

    • setProperties

      public void setProperties(Map props)

    • getTimeStamp

      public long getTimeStamp()
      Description copied from interface: Filter
      Returns the current modification timestamp on this Renderable node. This value will change whenever cached output data becomes invalid.
      Specified by:
      getTimeStamp in interface Filter
      Returns:
      Current modification timestamp value.

    • getSources

      public Vector getSources()
      Specified by:
      getSources in interface RenderableImage

    • isDynamic

      public boolean isDynamic()
      Forward the call (blocking until source is set if need be).
      Specified by:
      isDynamic in interface RenderableImage

    • getBounds2D

      public Rectangle2D getBounds2D()
      Implement the baseclass method to call getSource() so it will block until we have a real source.
      Specified by:
      getBounds2D in interface Filter

    • getMinX

      public float getMinX()
      Specified by:
      getMinX in interface RenderableImage

    • getMinY

      public float getMinY()
      Specified by:
      getMinY in interface RenderableImage

    • getWidth

      public float getWidth()
      Specified by:
      getWidth in interface RenderableImage

    • getHeight

      public float getHeight()
      Specified by:
      getHeight in interface RenderableImage

    • getProperty

      public Object getProperty(String name)
      Forward the call (blocking until source is set if need be).
      Specified by:
      getProperty in interface RenderableImage

    • getPropertyNames

      public String[] getPropertyNames()
      Forward the call (blocking until source is set if need be).
      Specified by:
      getPropertyNames in interface RenderableImage

    • createDefaultRendering

      public RenderedImage createDefaultRendering()
      Forward the call (blocking until source is set if need be).
      Specified by:
      createDefaultRendering in interface RenderableImage

    • createScaledRendering

      public RenderedImage createScaledRendering(int w, int h, RenderingHints hints)
      Forward the call (blocking until source is set if need be).
      Specified by:
      createScaledRendering in interface RenderableImage

    • createRendering

      public RenderedImage createRendering(RenderContext rc)
      Forward the call (blocking until source is set if need be).
      Specified by:
      createRendering in interface RenderableImage

    • getDependencyRegion

      public Shape getDependencyRegion(int srcIndex, Rectangle2D outputRgn)
      Forward the call (blocking until source is set if need be).
      Specified by:
      getDependencyRegion in interface Filter
      Parameters:
      srcIndex - The source to do the dependency calculation for.
      outputRgn - The region of output you are interested in generating dependencies for. The is given in the user coordiate system for this node.
      Returns:
      The region of input required. This is in the user coordinate system for the source indicated by srcIndex.

    • getDirtyRegion

      public Shape getDirtyRegion(int srcIndex, Rectangle2D inputRgn)
      Forward the call (blocking until source is set if need be).
      Specified by:
      getDirtyRegion in interface Filter
      Parameters:
      srcIndex - The input that inputRgn reflects changes in.
      inputRgn - the region of input that has changed, used to calculate the returned shape. This is given in the user coordinate system of the source indicated by srcIndex.
      Returns:
      The region of output that would be invalid given a change to inputRgn of the source selected by srcIndex. this is in the user coordinate system of this node.