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org.w3c.dom.traversal
Interface NodeFilter

All Known Subinterfaces:
LSSerializerFilter

public interface NodeFilter

Filters are objects that know how to "filter out" nodes. If a NodeIterator or TreeWalker is given a NodeFilter, it applies the filter before it returns the next node. If the filter says to accept the node, the traversal logic returns it; otherwise, traversal looks for the next node and pretends that the node that was rejected was not there.

The DOM does not provide any filters. NodeFilter is just an interface that users can implement to provide their own filters.

NodeFilters do not need to know how to traverse from node to node, nor do they need to know anything about the data structure that is being traversed. This makes it very easy to write filters, since the only thing they have to know how to do is evaluate a single node. One filter may be used with a number of different kinds of traversals, encouraging code reuse.

See also the Document Object Model (DOM) Level 2 Traversal and Range Specification.

Since:
DOM Level 2

Field Summary
static short FILTER_ACCEPT
          Accept the node.
static short FILTER_REJECT
          Reject the node.
static short FILTER_SKIP
          Skip this single node.
static int SHOW_ALL
          Show all Nodes.
static int SHOW_ATTRIBUTE
          Show Attr nodes.
static int SHOW_CDATA_SECTION
          Show CDATASection nodes.
static int SHOW_COMMENT
          Show Comment nodes.
static int SHOW_DOCUMENT
          Show Document nodes.
static int SHOW_DOCUMENT_FRAGMENT
          Show DocumentFragment nodes.
static int SHOW_DOCUMENT_TYPE
          Show DocumentType nodes.
static int SHOW_ELEMENT
          Show Element nodes.
static int SHOW_ENTITY
          Show Entity nodes.
static int SHOW_ENTITY_REFERENCE
          Show EntityReference nodes.
static int SHOW_NOTATION
          Show Notation nodes.
static int SHOW_PROCESSING_INSTRUCTION
          Show ProcessingInstruction nodes.
static int SHOW_TEXT
          Show Text nodes.
 
Method Summary
 short acceptNode(Node n)
          Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator.
 

Field Detail

FILTER_ACCEPT

static final short FILTER_ACCEPT
Accept the node. Navigation methods defined for NodeIterator or TreeWalker will return this node.

See Also:
Constant Field Values

FILTER_REJECT

static final short FILTER_REJECT
Reject the node. Navigation methods defined for NodeIterator or TreeWalker will not return this node. For TreeWalker, the children of this node will also be rejected. NodeIterators treat this as a synonym for FILTER_SKIP.

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Constant Field Values

FILTER_SKIP

static final short FILTER_SKIP
Skip this single node. Navigation methods defined for NodeIterator or TreeWalker will not return this node. For both NodeIterator and TreeWalker, the children of this node will still be considered.

See Also:
Constant Field Values

SHOW_ALL

static final int SHOW_ALL
Show all Nodes.

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Constant Field Values

SHOW_ELEMENT

static final int SHOW_ELEMENT
Show Element nodes.

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Constant Field Values

SHOW_ATTRIBUTE

static final int SHOW_ATTRIBUTE
Show Attr nodes. This is meaningful only when creating an NodeIterator or TreeWalker with an attribute node as its root; in this case, it means that the attribute node will appear in the first position of the iteration or traversal. Since attributes are never children of other nodes, they do not appear when traversing over the document tree.

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Constant Field Values

SHOW_TEXT

static final int SHOW_TEXT
Show Text nodes.

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Constant Field Values

SHOW_CDATA_SECTION

static final int SHOW_CDATA_SECTION
Show CDATASection nodes.

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Constant Field Values

SHOW_ENTITY_REFERENCE

static final int SHOW_ENTITY_REFERENCE
Show EntityReference nodes.

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Constant Field Values

SHOW_ENTITY

static final int SHOW_ENTITY
Show Entity nodes. This is meaningful only when creating an NodeIterator or TreeWalker with an Entity node as its root; in this case, it means that the Entity node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.

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Constant Field Values

SHOW_PROCESSING_INSTRUCTION

static final int SHOW_PROCESSING_INSTRUCTION
Show ProcessingInstruction nodes.

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Constant Field Values

SHOW_COMMENT

static final int SHOW_COMMENT
Show Comment nodes.

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Constant Field Values

SHOW_DOCUMENT

static final int SHOW_DOCUMENT
Show Document nodes.

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Constant Field Values

SHOW_DOCUMENT_TYPE

static final int SHOW_DOCUMENT_TYPE
Show DocumentType nodes.

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Constant Field Values

SHOW_DOCUMENT_FRAGMENT

static final int SHOW_DOCUMENT_FRAGMENT
Show DocumentFragment nodes.

See Also:
Constant Field Values

SHOW_NOTATION

static final int SHOW_NOTATION
Show Notation nodes. This is meaningful only when creating an NodeIterator or TreeWalker with a Notation node as its root; in this case, it means that the Notation node will appear in the first position of the traversal. Since notations are not part of the document tree, they do not appear when traversing over the document tree.

See Also:
Constant Field Values
Method Detail

acceptNode

short acceptNode(Node n)
Test whether a specified node is visible in the logical view of a TreeWalker or NodeIterator. This function will be called by the implementation of TreeWalker and NodeIterator; it is not normally called directly from user code. (Though you could do so if you wanted to use the same filter to guide your own application logic.)

Parameters:
n - The node to check to see if it passes the filter or not.
Returns:
A constant to determine whether the node is accepted, rejected, or skipped, as defined above.

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