kinow commented on pull request #116:
URL: https://github.com/apache/commons-imaging/pull/116#issuecomment-956081611


   @darkma773r 
   
   Thanks a lot for creating that pull request. Really clever the intermediate 
`GenericImageParser`. I liked it and might use it later! :+1: 
   
   A few questions/notes, feel free to point if any of what I say is off the 
mark.
   
   1. If the `JpegImageParser` requires a parameter different than the 
`TiffImageParser`, I assume we would have to create a new 
`JpegImagingParameter`. In that case, wouldn't we have to keep the old 
constructor for backward compatibility until a new major release?
   2. I think it would be best if cases like this were not allowed 
`PcxImagingParameters parser = new PcxImagingParameters(new 
TiffImagingParameters()); // no error in compile or runtime`
   3. I think you removed the option to allow `null` parameters in the 
`Imaging#writeImage` method (and other methods). I thought about doing that 
too, that would remove one generic suppress I think, but there are unit tests 
and examples. The API has allowed it since Sanselan, so not too sure about 
enforcing parameters to be non-null now.
   4. I liked the error in this one `new PngImageParser().writeImage(null, 
null, new TiffImagingParameters());`, which gives 
`java.lang.IllegalArgumentException: Invalid imaging parameters: expected 
type...`
   
   Your design really solves the generics problems, so I will take another look 
later and see if I find a middle way. See what you think about the `null` 
parameters, and allowing the empty parameters types for `Jpeg` and other 
parsers, or about the other notes @darkma773r :+1: 
   
   Thanks heaps!
   
   ```java
   Imaging.writeImage((BufferedImage) null, (OutputStream) null, 
ImageFormats.GIF, new TiffImagingParameters());
   // java.lang.IllegalArgumentException: Invalid imaging parameters: expected 
type org.apache.commons.imaging.common.XmpImagingParameters or a super class 
but was org.apache.commons.imaging.formats.tiff.TiffImagingParameters :+1: 
   ```


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