Added NodeIterator and Stream support #2051
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Improvement: added the NodeIterator class, to efficiently traverse a node tree using the Iterator interface. And added Stream Element#stream() and Node#nodeStream() methods, to enable fluent composable stream pipelines of node traversals. NodeIterator only hits nodes once (vs head and tail for NodeTraversor), is restartable, supports modifications of the node it just emitted (e.g. replace, remove), supports type filtering, and emits in document order. Refactored most head-only uses of NodeTraversor to use the NodeIterator or a Stream backed by it.
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Improvement: added the NodeIterator class, to efficiently traverse a node tree using the Iterator interface.
And added Stream Element#stream() and Node#nodeStream() methods, to enable fluent composable stream pipelines of node traversals.
NodeIterator only hits nodes once (vs head and tail for NodeTraversor), is restartable, supports modifications of the node it just emitted (e.g. replace, remove), supports type filtering, and emits in document order.
Refactored most head-only uses of NodeTraversor to use the NodeIterator or a Stream backed by it.