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Example document structure with TreeWalker assigned
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The Document Object Model: Processing Structured Documents
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function processNode(TreeWalker theWalker) { Node theNode = theWalkergetCurrentNode(); doStartNodeProcessing(theWalker); for (Node c = nfirstChild(); c != null; c = cnextSibling()) { processNode(theWalker); } doEndNodeProcessing(theWalker); theWalkersetCurrentNode(theNode); }
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The major advantage of using the TreeWalker over the regular Node interface in this example is that you can associate a NodeFilter with the TreeWalker to filter out unwanted nodes while keeping the same function that iterates over the document In fact, you could use the same processing function over and over with different TreeWalkers to obtain different results
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It is important to recognize that the logical view of a document represented by a TreeWalker may be a completely different structure from the physical view itself For example, a TreeWalker that only accepts Comment nodes would present all visible Comment nodes as siblings of each other, without any parent node
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How TreeWalkers Respond to Document Changes TreeWalker must deal with document structural changes just like NodeIterators do, but they do so in a different manner TreeWalkers are actually attached to their current node, so there does not need to be any logic that selects a new node when the current node is removed from the document tree or moved elsewhere within the tree For this reason, TreeWalkers are never invalidated like NodeIterators are Recall our example document from Figure 3-12, where node4 is the root node of a TreeWalker Suppose that node5 is the current node If node5 were removed from the document (via the removeChild() method of the Node interface, for example), the TreeWalker would go with it and remain valid, even though the current node is no longer part of the document tree If node5 had child nodes, you would still be able to navigate through them using the TreeWalker s methods, but you would not be able to navigate outside of node5 because it no longer has any parent node or siblings Suppose, further, that we were to add node5 back into the document, this time outside of the subtree represented by node4, which is still the root node For example, adding node5 between node2 and node3 would make node5 a child of
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3: Navigating and Manipulating Structured Documents
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node1 The TreeWalker would still be valid, and, in fact, calling parentNode() on it would return node1, which is outside of the root node represented by node4 This would result in a document structure represented by Figure 3-13 This is perfectly valid, and the TreeWalker can deal with such situations If the TreeWalker were to somehow navigate back into the subtree represented by node4, the TreeWalker s logic would then prevent it from navigating back outside of the root node again If the TreeWalker is being used with a filter, it gets slightly more complicated because moving the current node or explicitly selecting a new one can cause the TreeWalker to have a current node that would otherwise have been rejected or skipped by the filter s logic In this case, the DOM specification refers to the current node as a transient member of the logical view According to the specification, you can navigate off of this node just as if it had been visible, but you will not be able to navigate back to it unless the conditions of the filter s logic or the TreeWalker s whatToShow parameter changes If the current node somehow becomes a part of the document subtree that would otherwise have been rejected entirely by the filtering logic (that is, as if FILTER_REJECT had been returned for the subtree s root node), then all of the nodes in that subtree are transient members of the logical view The TreeWalker will navigate through the subtree as if its root node had only been skipped instead of rejected, until the TreeWalker navigates above it Then, normal filtering will apply For instance, suppose that, in our example document, node1 was set as the root node of the TreeWalker, node3 is the current node, and node4 represents a subtree that would be rejected entirely by the TreeWalker If node3 is somehow inserted into the subtree represented by node4, the TreeWalker will navigate around inside the node4 subtree until the navigation takes the TreeWalker above node4 From then on, node4 and all its child nodes will be skipped
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Figure 3-13
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