public class ActiveImagePlusPreprocessor
extends AbstractSingleInputPreprocessor

TODO: this class can be removed once Dataset and ImagePlus conversion is done properly via wrapping. Until that point, it needs to run before the ActiveDatasetPreprocessor.

Assigns the active ImagePlus when there is one single unresolved ImagePlus parameter. Hence, rather than a dialog prompting the user to choose an ImagePlus, the active ImagePlus is used automatically.

In the case of more than one ImagePlus parameter, the active ImagePlus is not used and instead the user must select. This behavior is consistent with ImageJ v1.x.

The same process is applied for ImageStack and ImageProcessor parameters, using the active ImagePlus's associated ImageStack and active ImageProcessor slice, respectively.