darkma773r commented on pull request #116:
URL: https://github.com/apache/commons-imaging/pull/116#issuecomment-959156762
I just had another thought on this: it strikes me that the main issue with
the generic `ImagerParser<P extends ImagingParameters>` format is how to deal
with format-agnostic code, mainly the utility methods in `Imaging`. In other
words, how do users specify parameters when they don't even know what the
format is? The current approach is to have users pass in their own parameters
objects to these utility methods but this gets into the problem of what happens
when they pass the wrong parameters type. What if we flipped this? Instead of
having the users create the parameters object, we have the parser create one
and then have the user modify it as needed in a callback. So, instead of this
```
public static byte[] getICCProfileBytes(final File file, final
ImagingParameters params) {
// hopefully params is of the correct type!
}
```
we do this
```
public static byte[] getICCProfileBytes(final File file, final
Consumer<ImagingParameters> configurer) {
ImageParser<?> parser = ...; // get the parser
return getICCProfileBytes(parser, configurer);
}
private static <P extends ImagingParameters> byte[] getICCProfileBytes(final
ImageParser<P> parser, final Consumer<ImagingParameters> configurer) {
P params = parser.getDefaultParameters();
if (configurer != null) {
// let the caller configure the parameters
configurer.accept(params);
}
// params is known to be the correct type
return parser.getICCProfileBytes(params);
}
```
Users would then call it like this:
```
Imaging.getICCProfileBytes(file, p -> p.setStrict(true));
```
We could also add methods to `ImageParser` that accept consumers like this
for consistency. That would probably be best.
Thoughts?
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