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   Re:question: NodeIterator in DOM

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  • From: akitoshi.yoshida@sap-ag.de (Akitoshi Yoshida)
  • To: xml-dev@ic.ac.uk
  • Date: Fri, 15 May 1998 17:19:56 +0200 (METDST)

Another question regarding NodeIterator:
You have an NodeIterator instance with the iterator
position set somewhere in the middle. When you
remove three nodes: first, the node just after the
iterator position, second the node after this removed
node, and finally the node just before
the original iterator position,
then what should toNextNode() and toPrevNode() return?

in example:
we have nodes A B C D E.
the iterator is positioned just before C.
remove C, D, and B.
then we have A E and the iterator position should be
positioned just before E.
so toNextNode() and toPrevNode() should return E and A, respectively.

NodeIterator may mark its current iterator position by
an integer offset or by an object reference. but it must
be notified for certain insert and remove operations to
preserve the above semantics. Is it correct?


---- original message
I have a question on NodeIterator in DOM-19980416.

Excerpt from the spec:

  If a node is inserted before the node just after
  the iterator position, it will be returned by getNextNode();
  likewise if a node is inserted after the node just previous
  to the iterator position, it will be return by the next
  getPrevNode() call.

The first part is clear. When a Node is inserted by insertBefore()
at the node just before the iterator position, the iterator position
is set in front of this new node. The second part
starting "likewise.." is not clear to me.  Are we assuming the
existance of the insertAfter() method? It sounds like the
insertion position (relative to the nodes) is the same as
in the first case. If we only have the
insertBefore() method in the Node inteface,
how can we distinguish the above two cases?

thanks in advance for any clarification


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