Normal This class should be rewritten to use a tree walk, not all this allocating/iterating layers.
See also JSON issue DFDL-1210, which also needs an Infoset tree walker.
class InfosetSourceFromTree(doc: InfosetDocument) extends InfosetSource {
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//
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// FIXME
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// TODO - Performance - this has to be fast. Round trip processing where you first parse
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// and then unparse data will use this to generate the infoset events.
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// That's an important use case
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//
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// So all this Stream/Iterator baggage has to go and be replaced by a straightforward tree walk.
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//
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// Note however, that there are other kinds of infoset tree walks needed (e.g., JSON output, and XML
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// output should be revise to use this tree walker once it is written.)
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//
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// So we need an infoset tree walker that can be used to implement a few patterns.
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//
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....
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