Hello Sling Devs, I've got a question about the sling models [FirstImplementationPicker][1]. This appears to essentially be a "default" implementation picker. It will be used in two situation: (1) my app doesn't provide any other ImplementationPickers; (2) all my app's ImplementationPickers returned null, declaring that they couldn't find an implementation.
The Second situation has caused me a bit of pain today, and I'm wondering FirstImplementationPicker was intended to act in that situation. Here's my thinking: I have an interface which has multiple implementations. The correct implementation will be chosen based on a property of the Resource being adapted. If there is no Implementation found for one of the possible values of that property, I would like the resource to *not* be adapted (i.e. the adaptTo() returning null). So, I wrote a custom ImplementationPicker and returned null when there is no matching implementation, but then saw that one of my Impl's was chosen seemingly arbitrarily. I wonder if a "better" default implementation picker would return null if it is given multiple implementationTypes since it can't determine how one would want to choose one over the other, and only return the implementationType if there is only one to choose from. WDYT? Do I just have bad expectations of this Interface? [1]: https://github.com/apache/sling/blob/trunk/bundles/extensions/models/impl/src/main/java/org/apache/sling/models/impl/FirstImplementationPicker.java Jordan Shurmer | Software Engineer | Scripps Lifestyle Studios 9721 Sherrill Blvd, Knoxville TN 37932 Office: 865-560-4887 jshur...@scrippsnetworks.com SCRIPPS NETWORKS INTERACTIVE | the Leader in Lifestyle Media | scrippsnetworksinteractive.com HGTV | Food Network | Travel Channel | DIY Network | Cooking Channel | Great American Country | TVN | Fine Living | Asian Food Channel
