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Outgoing drag & drop

From comments made by Vladimir Lhotak and the Javadoc for com.apple.mrj.datatransfer.FileTransferable it seems that both single files and multiple files are transferred to and from native apps in a transferable with type OSTypeFlavor.kTypeHFS, where in the case of multiple files the transfer data is itself an array of Transferables.

For incoming drags this array is translated to a transferable with flavor DataFlavor.javaFileListFlavor (ie. a java.util.List of java.io.File objects), as expected by Java.

However, the converse translation does not seem to be applied for outgoing drags. Instead, a transferable consisting of a single serialized File (with flavor TranslationUtils.kTypeJavaFile) is translated to kTypeHFS, but there doesn't seem to be any way to transfer a list of files.

Why doesn't the outgoing drag do the converse translation, is this just an oversight or is there some fundamental reason why I can't drag more than one file from Java? Could I create a transferable of type kTypeHFS (containing a nested array of transferables) myself to do this? And who or what is the Kucing paradigm??

-Rolf
--
Rolf Howarth, Square Box Systems Ltd, Stratford-upon-Avon UK.
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