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Using the DOM Level 2 Traversal Module
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DOM Level 2 introduced a new module named Traversal It specifies four interfaces: NodeIterator, NodeFilter, TreeWalker, and DocumentTraversal The first three
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3: Navigating and Manipulating Structured Documents
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interfaces provide robust node traversal functionality over a document s nodes The DocumentTraversal interface provides the factory methods necessary for creating TreeWalkers and NodeIterators
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Iterators vs Walkers
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NodeIterators and TreeWalkers represent two very different ways of representing a document subtree s set of nodes NodeIterators present a flattened view of the document: the nodes are presented in the order they are encountered in the document, as if they had been laid out one after the other They present their nodes absent of the hierarchy in the document, so they allow you only to move forward and backward through a list of nodes TreeWalkers, on the other hand, maintain their representation of the document hierarchy relative to the node that they are currently attached to So why use a NodeIterator instead of a TreeWalker (or vice versa) Generally speaking, NodeIterators are more useful when your DOM application is focused on the contents of each node TreeWalkers are better when your application will manipulate the structure of the subtree s nodes
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Logical Views and Physical Views
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NodeIterators and TreeWalkers have the ability to present views of the document subtree that may not contain all of the nodes that are actually in the subtree For example, a NodeIterator or TreeWalker can be told to only visit Element nodes, excluding other node types The DOM Traversal module specification refers to this as a logical view The actual document subtree independent of the iterator or walker is called the physical view The way this is accomplished is by associating a NodeFilter object with the NodeIterator or TreeWalker The NodeFilter examines each node and determines whether it should be included in the logical view NodeFilters are very powerful objects: they can include or exclude nodes based on almost any criteria you can think of, including node type, whether it has or doesn t have certain attributes, what the node s nodeName property is, and so on Figure 3-9 illustrates the difference between a physical view and a logical view of the same document The document contains several different node types, but the logical view as seen by a certain traversal object contains only Element nodes (shown with bold outlines) because it has chosen to exclude all other node types
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The Document Object Model: Processing Structured Documents
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Figure 3-9
Logical view vs physical view
Like other DOM collection objects, NodeIterators and TreeWalkers contain live node references; that is, their logical views will reflect any changes made to the physical subtree that they represent The key difference between the two, however, is how they respond to such changes NodeIterators will attempt to maintain their location relative to a sequence of nodes when the sequence changes TreeWalkers will maintain their current location relative to their current node and will stay attached to that node if it moves to a new context due to an external action on the tree by another part of the DOM program These behaviors will be discussed in more detail later in this chapter
NodeFilters
NodeFilters are objects that are used to filter the node selection process They can be associated with both NodeIterators and TreeWalkers, but they do not do any node navigation themselves If a NodeFilter is associated with an iterator or walker, the associated traversal object applies the filter before returning the next node The filter can decide either to accept or to reject the node If the node is accepted, the traversal object returns it to the caller Otherwise, the node is skipped as if it were not there, and the traversal object looks for the next node (this is how the logical view is generated from the physical view) NodeFilters do not have to perform any node navigation or traversal themselves, so they are easy to write and can be reused among several different traversal objects The DOM itself does not provide any built-in NodeFilters You can think of the NodeFilter interface as an abstract base class in C++ or an interface definition in Java that DOM programs can use as a starting point to build their own filters
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