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<h1>DOMNodeFilter Class Reference</h1>Filters are objects that know how to "filter out" nodes.
<a href="#_details">More...</a>
<p>
Inheritance diagram for DOMNodeFilter:<p><center><img src="classDOMNodeFilter__inherit__graph.png" border="0" usemap="#DOMNodeFilter__inherit__map" alt="Inheritance graph"></center>
<map name="DOMNodeFilter__inherit__map">
<area href="classDOMWriterFilter.html" shape="rect" coords="8,83,128,107" alt="">
</map>
<center><font size="2">[<a href="graph_legend.html">legend</a>]</font></center><a href="classDOMNodeFilter-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Types</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Public Contants</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="classDOMNodeFilter.html#z243_0">FilterAction</a> { <a class="el" href="classDOMNodeFilter.html#z243_0w0">FILTER_ACCEPT</a> = 1,
<a class="el" href="classDOMNodeFilter.html#z243_0w1">FILTER_REJECT</a> = 2,
<a class="el" href="classDOMNodeFilter.html#z243_0w2">FILTER_SKIP</a> = 3
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constants returned by acceptNode. <a href="classDOMNodeFilter.html#z243_0">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum </td><td class="memItemRight" valign="bottom"><a class="el" href="classDOMNodeFilter.html#z243_1">ShowType</a> { <br>
<a class="el" href="classDOMNodeFilter.html#z243_1w3">SHOW_ALL</a> = 0x0000FFFF,
<a class="el" href="classDOMNodeFilter.html#z243_1w4">SHOW_ELEMENT</a> = 0x00000001,
<a class="el" href="classDOMNodeFilter.html#z243_1w5">SHOW_ATTRIBUTE</a> = 0x00000002,
<a class="el" href="classDOMNodeFilter.html#z243_1w6">SHOW_TEXT</a> = 0x00000004,
<br>
<a class="el" href="classDOMNodeFilter.html#z243_1w7">SHOW_CDATA_SECTION</a> = 0x00000008,
<a class="el" href="classDOMNodeFilter.html#z243_1w8">SHOW_ENTITY_REFERENCE</a> = 0x00000010,
<a class="el" href="classDOMNodeFilter.html#z243_1w9">SHOW_ENTITY</a> = 0x00000020,
<a class="el" href="classDOMNodeFilter.html#z243_1w10">SHOW_PROCESSING_INSTRUCTION</a> = 0x00000040,
<br>
<a class="el" href="classDOMNodeFilter.html#z243_1w11">SHOW_COMMENT</a> = 0x00000080,
<a class="el" href="classDOMNodeFilter.html#z243_1w12">SHOW_DOCUMENT</a> = 0x00000100,
<a class="el" href="classDOMNodeFilter.html#z243_1w13">SHOW_DOCUMENT_TYPE</a> = 0x00000200,
<a class="el" href="classDOMNodeFilter.html#z243_1w14">SHOW_DOCUMENT_FRAGMENT</a> = 0x00000400,
<br>
<a class="el" href="classDOMNodeFilter.html#z243_1w15">SHOW_NOTATION</a> = 0x00000800
<br>
}</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Constants for whatToShow. <a href="classDOMNodeFilter.html#z243_1">More...</a><br></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Destructor</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classDOMNodeFilter.html#z241_0">~DOMNodeFilter</a> ()</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <a href="#z241_0"></a><br></td></tr>
<tr><td colspan="2"><div class="groupHeader">Functions introduced in DOM Level 2</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">virtual short </td><td class="memItemRight" valign="bottom"><a class="el" href="classDOMNodeFilter.html#z245_0">acceptNode</a> (const <a class="el" href="classDOMNode.html">DOMNode</a> *node) const =0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Test whether a specified node is visible in the logical view of a <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> or <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code>. <a href="#z245_0"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Protected Member Functions</h2></td></tr>
<tr><td colspan="2"><div class="groupHeader">Hidden constructors</div></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classDOMNodeFilter.html#z237_0">DOMNodeFilter</a> ()</td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Filters are objects that know how to "filter out" nodes.
<p>
If a <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> is given a <code>DOMNodeFilter</code>, 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. <p>
The DOM does not provide any filters. <code>DOMNodeFilter</code> is just an interface that users can implement to provide their own filters. <p>
<code>DOMNodeFilters</code> 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. <p>
See also the <a href="http://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113">Document Object Model (DOM) Level 2 Traversal and Range Specification</a>. <dl compact><dt><b>Since:</b></dt><dd>DOM Level 2 </dd></dl>
<p>
<hr><h2>Member Enumeration Documentation</h2>
<a class="anchor" name="z243_0" doxytag="DOMNodeFilter::FilterAction"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">enum <a class="el" href="classDOMNodeFilter.html#z243_0">DOMNodeFilter::FilterAction</a> </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Constants returned by acceptNode.
<p>
<code>FILTER_ACCEPT:</code> Accept the node. Navigation methods defined for <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> will return this node.<p>
<code>FILTER_REJECT:</code> Reject the node. Navigation methods defined for <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> will not return this node. For <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code>, the children of this node will also be rejected. <code>DOMNodeIterators</code> treat this as a synonym for <code>FILTER_SKIP.</code><p>
<code>FILTER_SKIP:</code> Skip this single node. Navigation methods defined for <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> will not return this node. For both <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> and <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code>, the children of this node will still be considered.<p>
<dl compact><dt><b>Since:</b></dt><dd>DOM Level 2 </dd></dl>
<dl compact><dt><b>Enumeration values: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="z243_0w0" doxytag="FILTER_ACCEPT"></a>FILTER_ACCEPT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_0w1" doxytag="FILTER_REJECT"></a>FILTER_REJECT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_0w2" doxytag="FILTER_SKIP"></a>FILTER_SKIP</em> </td><td>
</td></tr>
</table>
</dl>
</td>
</tr>
</table>
<a class="anchor" name="z243_1" doxytag="DOMNodeFilter::ShowType"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">enum <a class="el" href="classDOMNodeFilter.html#z243_1">DOMNodeFilter::ShowType</a> </td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Constants for whatToShow.
<p>
<code>SHOW_ALL:</code> Show all <code>DOMNode(s)</code>.<p>
<code>SHOW_ELEMENT:</code> Show <code><a class="el" href="classDOMElement.html">DOMElement</a></code> nodes.<p>
<code>SHOW_ATTRIBUTE:</code> Show <code><a class="el" href="classDOMAttr.html">DOMAttr</a></code> nodes. This is meaningful only when creating an <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> with an attribute node as its <code>root</code>; 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.<p>
<code>SHOW_TEXT:</code> Show <code><a class="el" href="classDOMText.html">DOMText</a></code> nodes.<p>
<code>SHOW_CDATA_SECTION:</code> Show <code><a class="el" href="classDOMCDATASection.html">DOMCDATASection</a></code> nodes.<p>
<code>SHOW_ENTITY_REFERENCE:</code> Show <code><a class="el" href="classDOMEntityReference.html">DOMEntityReference</a></code> nodes.<p>
<code>SHOW_ENTITY:</code> Show <code><a class="el" href="classDOMEntity.html">DOMEntity</a></code> nodes. This is meaningful only when creating an <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> with an <code><a class="el" href="classDOMEntity.html">DOMEntity</a></code> node as its <code>root</code>; in this case, it means that the <code><a class="el" href="classDOMEntity.html">DOMEntity</a></code> 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.<p>
<code>SHOW_PROCESSING_INSTRUCTION:</code> Show <code><a class="el" href="classDOMProcessingInstruction.html">DOMProcessingInstruction</a></code> nodes.<p>
<code>SHOW_COMMENT:</code> Show <code><a class="el" href="classDOMComment.html">DOMComment</a></code> nodes.<p>
<code>SHOW_DOCUMENT:</code> Show <code><a class="el" href="classDOMDocument.html">DOMDocument</a></code> nodes.<p>
<code>SHOW_DOCUMENT_TYPE:</code> Show <code><a class="el" href="classDOMDocumentType.html">DOMDocumentType</a></code> nodes.<p>
<code>SHOW_DOCUMENT_FRAGMENT:</code> Show <code><a class="el" href="classDOMDocumentFragment.html">DOMDocumentFragment</a></code> nodes.<p>
<code>SHOW_NOTATION:</code> Show <code><a class="el" href="classDOMNotation.html">DOMNotation</a></code> nodes. This is meaningful only when creating an <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code> or <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> with a <code><a class="el" href="classDOMNotation.html">DOMNotation</a></code> node as its <code>root</code>; in this case, it means that the <code><a class="el" href="classDOMNotation.html">DOMNotation</a></code> 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.<p>
<dl compact><dt><b>Since:</b></dt><dd>DOM Level 2 </dd></dl>
<dl compact><dt><b>Enumeration values: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="z243_1w3" doxytag="SHOW_ALL"></a>SHOW_ALL</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w4" doxytag="SHOW_ELEMENT"></a>SHOW_ELEMENT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w5" doxytag="SHOW_ATTRIBUTE"></a>SHOW_ATTRIBUTE</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w6" doxytag="SHOW_TEXT"></a>SHOW_TEXT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w7" doxytag="SHOW_CDATA_SECTION"></a>SHOW_CDATA_SECTION</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w8" doxytag="SHOW_ENTITY_REFERENCE"></a>SHOW_ENTITY_REFERENCE</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w9" doxytag="SHOW_ENTITY"></a>SHOW_ENTITY</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w10" doxytag="SHOW_PROCESSING_INSTRUCTION"></a>SHOW_PROCESSING_INSTRUCTION</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w11" doxytag="SHOW_COMMENT"></a>SHOW_COMMENT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w12" doxytag="SHOW_DOCUMENT"></a>SHOW_DOCUMENT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w13" doxytag="SHOW_DOCUMENT_TYPE"></a>SHOW_DOCUMENT_TYPE</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w14" doxytag="SHOW_DOCUMENT_FRAGMENT"></a>SHOW_DOCUMENT_FRAGMENT</em> </td><td>
</td></tr>
<tr><td valign="top"><em><a class="anchor" name="z243_1w15" doxytag="SHOW_NOTATION"></a>SHOW_NOTATION</em> </td><td>
</td></tr>
</table>
</dl>
</td>
</tr>
</table>
<hr><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" name="z237_0" doxytag="DOMNodeFilter::DOMNodeFilter"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">DOMNodeFilter::DOMNodeFilter </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [protected]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
</td>
</tr>
</table>
<a class="anchor" name="z241_0" doxytag="DOMNodeFilter::~DOMNodeFilter"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual DOMNodeFilter::~<a class="el" href="classDOMNodeFilter.html">DOMNodeFilter</a> </td>
<td class="md" valign="top">( </td>
<td class="mdname1" valign="top" nowrap> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap><code> [virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Destructor.
<p>
</td>
</tr>
</table>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="z245_0" doxytag="DOMNodeFilter::acceptNode"></a><p>
<table class="mdTable" cellpadding="2" cellspacing="0">
<tr>
<td class="mdRow">
<table cellpadding="0" cellspacing="0" border="0">
<tr>
<td class="md" nowrap valign="top">virtual short DOMNodeFilter::acceptNode </td>
<td class="md" valign="top">( </td>
<td class="md" nowrap valign="top">const <a class="el" href="classDOMNode.html">DOMNode</a> * </td>
<td class="mdname1" valign="top" nowrap> <em>node</em> </td>
<td class="md" valign="top"> ) </td>
<td class="md" nowrap> const<code> [pure virtual]</code></td>
</tr>
</table>
</td>
</tr>
</table>
<table cellspacing="5" cellpadding="0" border="0">
<tr>
<td>
</td>
<td>
<p>
Test whether a specified node is visible in the logical view of a <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> or <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code>.
<p>
This function will be called by the implementation of <code><a class="el" href="classDOMTreeWalker.html">DOMTreeWalker</a></code> and <code><a class="el" href="classDOMNodeIterator.html">DOMNodeIterator</a></code>; 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.) <dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>node</em> </td><td>The node to check to see if it passes the filter or not. </td></tr>
</table>
</dl>
<dl compact><dt><b>Returns:</b></dt><dd>A constant to determine whether the node is accepted, rejected, or skipped, as defined above. </dd></dl>
<dl compact><dt><b>Since:</b></dt><dd>DOM Level 2 </dd></dl>
<p>
Implemented in <a class="el" href="classDOMWriterFilter.html#z363_0">DOMWriterFilter</a>. </td>
</tr>
</table>
<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="DOMNodeFilter_8hpp-source.html">DOMNodeFilter.hpp</a></ul>
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