ImageWorker should provide a dispose method
-------------------------------------------
Key: GEOT-3907
URL: https://jira.codehaus.org/browse/GEOT-3907
Project: GeoTools
Issue Type: Improvement
Components: coverage
Affects Versions: 8.0-M2, 2.7.3, 2.7.4, 8.0-M3
Reporter: Simone Giannecchini
Assignee: Simone Giannecchini
Priority: Minor
ImageWorker does not provide a method to dispose it. Although we can do this
externally and although this is done most part of the time since the image it
contains are reused externally, it would be great to have such a method at hand
to not having to do it manually all the time.
Notice that I would refrain from putting also a finalize method where we
discards soruces recrusively since we might be using the internal image
somewhere else externally.
Here some sample code to use:
/**
* Provides a hint that this {@link ImageWorker} will no longer be accessed
from a reference in user space. The
* results are equivalent to those that occur when the program loses its
last reference to this
* image, the garbage collector discovers this, and finalize is called.
This can be used as a
* hint in situations where waiting for garbage collection would be overly
conservative.
*
* {@link ImageWorker} defines this method to remove the image being
disposed from the list of sinks in
* all of its source images.
*
* The results of referencing an {@link ImageWorker} after a call to
dispose() are undefined.
*/
public final void dispose(){
this.commonHints.clear();
this.commonHints=null;
this.roi=null;
if(this.image instanceof PlanarImage)
ImageUtilities.disposePlanarImageChain(PlanarImage.wrapRenderedImage(image));
else
if(this.image instanceof BufferedImage){
((BufferedImage)this.image).flush();
this.image=null;
}
}
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