/usr/share/qt5/doc/qtxmlpatterns/qabstractxmlreceiver.html is in qtxmlpatterns5-doc-html 5.2.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 | <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- qabstractxmlreceiver.cpp -->
<title>QAbstractXmlReceiver Class | QtXmlPatterns </title>
<link rel="stylesheet" type="text/css" href="style/offline.css" />
</head>
<body>
<div class="header" id="qtdocheader">
<div class="main">
<div class="main-rounded">
<div class="navigationbar">
<ul>
<li>Qt 5.2</li>
<li><a href="qtxmlpatterns-index.html">Qt XML Patterns</a></li>
<li><a href="qtxmlpatterns-module.html">C++ Classes</a></li>
<li>QAbstractXmlReceiver</li>
<li id="buildversion">
Qt 5.2.1 Reference Documentation</li>
</ul>
</div>
</div>
<div class="content">
<div class="line">
<div class="content mainContent">
<div class="toc">
<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#public-functions">Public Functions</a></li>
<li class="level1"><a href="#details">Detailed Description</a></li>
<li class="level2"><a href="#xquery-sequences">XQuery Sequences</a></li>
</ul>
</div>
<h1 class="title">QAbstractXmlReceiver Class</h1>
<!-- $$$QAbstractXmlReceiver-brief -->
<p>The QAbstractXmlReceiver class provides a callback interface for transforming the output of a <a href="qxmlquery.html">QXmlQuery</a>. <a href="#details">More...</a></p>
<!-- @@@QAbstractXmlReceiver -->
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> Header:</td><td class="memItemRight bottomAlign"> </b><tt><span class="preprocessor">#include <QAbstractXmlReceiver></span>
</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> qmake:</td><td class="memItemRight bottomAlign"> <tt>QT += xmlpatterns</tt></td></tr><tr><td class="memItemLeft rightAlign topAlign"> Since:</td><td class="memItemRight bottomAlign"> Qt 4.4</td></tr><tr><td class="memItemLeft rightAlign topAlign"> Inherited By:</td><td class="memItemRight bottomAlign"> <p><a href="qxmlserializer.html">QXmlSerializer</a>.</p>
</td></tr></table><p><b>Note:</b> All functions in this class are reentrant.</p>
<ul>
<li><a href="qabstractxmlreceiver-members.html">List of all members, including inherited members</a></li>
</ul>
<a name="public-functions"></a>
<h2>Public Functions</h2>
<table class="alignedsummary">
<tr><td class="memItemLeft rightAlign topAlign"> </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#QAbstractXmlReceiver">QAbstractXmlReceiver</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#dtor.QAbstractXmlReceiver">~QAbstractXmlReceiver</a></b>()</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#atomicValue">atomicValue</a></b>(const QVariant &<i> value</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#attribute">attribute</a></b>(const QXmlName &<i> name</i>, const QStringRef &<i> value</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#characters">characters</a></b>(const QStringRef &<i> value</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#comment">comment</a></b>(const QString &<i> value</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#endDocument">endDocument</a></b>() = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#endElement">endElement</a></b>() = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#endOfSequence">endOfSequence</a></b>() = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#namespaceBinding">namespaceBinding</a></b>(const QXmlName &<i> name</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#processingInstruction">processingInstruction</a></b>(const QXmlName &<i> target</i>, const QString &<i> value</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#startDocument">startDocument</a></b>() = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#startElement">startElement</a></b>(const QXmlName &<i> name</i>) = 0</td></tr>
<tr><td class="memItemLeft rightAlign topAlign"> virtual void </td><td class="memItemRight bottomAlign"><b><a href="qabstractxmlreceiver.html#startOfSequence">startOfSequence</a></b>() = 0</td></tr>
</table>
<a name="details"></a>
<!-- $$$QAbstractXmlReceiver-description -->
<div class="descr">
<h2>Detailed Description</h2>
<p>The QAbstractXmlReceiver class provides a callback interface for transforming the output of a <a href="qxmlquery.html">QXmlQuery</a>.</p>
<p>QAbstractXmlReceiver is an abstract base class that provides a callback interface for receiving an <a href="#xquery-sequence">XQuery sequence</a>, usually the output of an <a href="qxmlquery.html">QXmlQuery</a>, and transforming that sequence into a structure of your choosing, usually XML. Consider the example:</p>
<pre class="cpp"><span class="type"><a href="qxmlquery.html">QXmlQuery</a></span> query;
query<span class="operator">.</span>setQuery(<span class="string">"doc('index.html')/html/body/p[1]"</span>);
<span class="type"><a href="qxmlserializer.html">QXmlSerializer</a></span> serializer(query<span class="operator">,</span> myOutputDevice);
query<span class="operator">.</span>evaluateTo(<span class="operator">&</span>serializer);</pre>
<p>First it constructs a <a href="qxmlquery.html">query</a> that gets the first paragraph from document <tt>index.html</tt>. Then it constructs an <a href="qxmlserializer.html">XML serializer</a> with the <a href="qxmlquery.html">query</a> and myOutputDevice (Note the <a href="qxmlserializer.html">serializer</a> is an <i>XML receiver</i>, ie a subclass of QAbstractXmlReceiver). Finally, it <a href="qxmlquery.html#evaluateTo">evaluates</a> the <a href="qxmlquery.html">query</a>, producing an ordered sequence of calls to the <a href="qxmlserializer.html">serializer's</a> callback functions. The sequence of callbacks transforms the query output to XML and writes it to myOutputDevice.</p>
<p>Although the example uses <a href="qxmlquery.html">QXmlQuery</a> to produce the sequence of callbacks to functions in QAbstractXmlReceiver, you can call the callback functions directly as long as your sequence of calls represents a valid <a href="#xquery-sequence">XQuery sequence</a>.</p>
<a name="xquery-sequence"></a><a name="xquery-sequences"></a>
<h3>XQuery Sequences</h3>
<p>An <a href="xmlprocessing.html">XQuery</a> <i>sequence</i> is an ordered collection of zero, one, or many <i>items</i>. Each <i>item</i> is either an <i>atomic value</i> or a <i>node</i>. An <i>atomic value</i> is a simple data value.</p>
<p>There are six kinds of <i>nodes</i>.</p>
<ul>
<li>An <i>Element Node</i> represents an XML element.</li>
<li>An <i>Attribute Node</i> represents an XML attribute.</li>
<li>A <i>Document Node</i> represents an entire XML document.</li>
<li>A <i>Text Node</i> represents character data (element content).</li>
<li>A <i>Processing Instruction Node</i> represents an XML processing instruction, which is used in an XML document to tell the application reading the document to perform some action. A typical example is to use a processing instruction to tell the application to use a particular XSLT stylesheet to display the document.</li>
<li>And a <i>Comment node</i> represents an XML comment.</li>
</ul>
<p>The <i>sequence</i> of <i>nodes</i> and <i>atomic values</i> obeys the following rules. Note that <i>Namespace Node</i> refers to a special <i>Attribute Node</i> with name <i>xmlns</i>.</p>
<ul>
<li>Each <i>node</i> appears in the <i>sequence</i> before its children and their descendants appear.</li>
<li>A <i>node</i>'s descendants appear in the <i>sequence</i> before any of its siblings appear.</li>
<li>A <i>Document Node</i> represents an entire document. Zero or more <i>Document Nodes</i> can appear in a <i>sequence</i>, but they can only be top level items (i.e., a <i>Document Node</i> can't be a child of another <i>node</i>.</li>
<li><i>Namespace Nodes</i> immediately follow the <i>Element Node</i> with which they are associated.</li>
<li><i>Attribute Nodes</i> immediately follow the <i>Namespace Nodes</i> of the element with which they are associated, or...</li>
<li>If there are no <i>Namespace Nodes</i> following an element, then the <i>Attribute Nodes</i> immediately follow the element.</li>
<li>An <i>atomic value</i> can only appear as a top level <i>item</i>, i.e., it can't appear as a child of a <i>node</i>.</li>
<li><i>Processing Instruction Nodes</i> do not have children, and their parent is either a <i>Document Node</i> or an <i>Element Node</i>.</li>
<li><i>Comment Nodes</i> do not have children, and their parent is either a <i>Document Node</i> or an <i>Element Node</i>.</li>
</ul>
<p>The <i>sequence</i> of <i>nodes</i> and <i>atomic values</i> is sent to an QAbstractXmlReceiver (<a href="qxmlserializer.html">QXmlSerializer</a> in the example above) as a sequence of calls to the receiver's callback functions. The mapping of callback functions to sequence items is as follows.</p>
<ul>
<li><a href="qabstractxmlreceiver.html#startDocument">startDocument</a>() and <a href="qabstractxmlreceiver.html#endDocument">endDocument</a>() are called for each <i>Document Node</i> in the <i>sequence</i>. <a href="qabstractxmlreceiver.html#endDocument">endDocument</a>() is not called until all the <i>Document Node's</i> children have appeared in the <i>sequence</i>.</li>
<li><a href="qabstractxmlreceiver.html#startElement">startElement</a>() and <a href="qabstractxmlreceiver.html#endElement">endElement</a>() are called for each <i>Element Node</i>. <a href="qabstractxmlreceiver.html#endElement">endElement</a>() is not called until all the <i>Element Node's</i> children have appeared in the <i>sequence</i>.</li>
<li><a href="qabstractxmlreceiver.html#attribute">attribute</a>() is called for each <i>Attribute Node</i>.</li>
<li><a href="qabstractxmlreceiver.html#comment">comment</a>() is called for each <i>Comment Node</i>.</li>
<li><a href="qabstractxmlreceiver.html#characters">characters</a>() is called for each <i>Text Node</i>.</li>
<li><a href="qabstractxmlreceiver.html#processingInstruction">processingInstruction</a>() is called for each <i>Processing Instruction Node</i>.</li>
<li><a href="qabstractxmlreceiver.html#namespaceBinding">namespaceBinding</a>() is called for each <i>Namespace Node</i>.</li>
<li><a href="qabstractxmlreceiver.html#atomicValue">atomicValue</a>() is called for each <i>atomic value</i>.</li>
</ul>
<p>For a complete explanation of <a href="xmlprocessing.html">XQuery</a> sequences, visit <a href="http://www.w3.org/TR/xpath-datamodel/">XQuery Data Model</a>.</p>
</div>
<p><b>See also </b><a href="http://www.w3.org/TR/xpath-datamodel/">W3C XQuery 1.0 and XPath 2.0 Data Model (XDM)</a>, <a href="qxmlserializer.html">QXmlSerializer</a>, and <a href="qxmlresultitems.html">QXmlResultItems</a>.</p>
<!-- @@@QAbstractXmlReceiver -->
<div class="func">
<h2>Member Function Documentation</h2>
<!-- $$$QAbstractXmlReceiver[overload1]$$$QAbstractXmlReceiver -->
<h3 class="fn"><a name="QAbstractXmlReceiver"></a>QAbstractXmlReceiver::<span class="name">QAbstractXmlReceiver</span>()</h3>
<p>Constructs an abstract xml receiver.</p>
<!-- @@@QAbstractXmlReceiver -->
<!-- $$$~QAbstractXmlReceiver[overload1]$$$~QAbstractXmlReceiver -->
<h3 class="fn"><a name="dtor.QAbstractXmlReceiver"></a>QAbstractXmlReceiver::<span class="name">~QAbstractXmlReceiver</span>()<tt> [virtual]</tt></h3>
<p>Destroys the xml receiver.</p>
<!-- @@@~QAbstractXmlReceiver -->
<!-- $$$atomicValue[overload1]$$$atomicValueconstQVariant& -->
<h3 class="fn"><a name="atomicValue"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">atomicValue</span>(const <span class="type">QVariant</span> &<i> value</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when an atomic value appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>. The <i>value</i> is a simple data value. It is guaranteed to be valid.</p>
<!-- @@@atomicValue -->
<!-- $$$attribute[overload1]$$$attributeconstQXmlName&constQStringRef& -->
<h3 class="fn"><a name="attribute"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">attribute</span>(const <span class="type"><a href="qxmlname.html">QXmlName</a></span> &<i> name</i>, const <span class="type">QStringRef</span> &<i> value</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when an attribute node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>. <i>name</i> is the <a href="qxmlname.html">attribute name</a> and the <i>value</i> string contains the attribute value.</p>
<!-- @@@attribute -->
<!-- $$$characters[overload1]$$$charactersconstQStringRef& -->
<h3 class="fn"><a name="characters"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">characters</span>(const <span class="type">QStringRef</span> &<i> value</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when a text node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>. The <i>value</i> contains the text. Adjacent text nodes may not occur in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>, i.e., this callback must not be called twice in a row.</p>
<!-- @@@characters -->
<!-- $$$comment[overload1]$$$commentconstQString& -->
<h3 class="fn"><a name="comment"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">comment</span>(const <span class="type">QString</span> &<i> value</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when a comment node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>. The <i>value</i> is the comment text, which must not contain the string "--".</p>
<!-- @@@comment -->
<!-- $$$endDocument[overload1]$$$endDocument -->
<h3 class="fn"><a name="endDocument"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">endDocument</span>()<tt> [pure virtual]</tt></h3>
<p>This callback is called when the end of a document node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>.</p>
<!-- @@@endDocument -->
<!-- $$$endElement[overload1]$$$endElement -->
<h3 class="fn"><a name="endElement"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">endElement</span>()<tt> [pure virtual]</tt></h3>
<p>This callback is called when the end of an element node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>.</p>
<!-- @@@endElement -->
<!-- $$$endOfSequence[overload1]$$$endOfSequence -->
<h3 class="fn"><a name="endOfSequence"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">endOfSequence</span>()<tt> [pure virtual]</tt></h3>
<p>This callback is called once only, right after the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a> ends.</p>
<!-- @@@endOfSequence -->
<!-- $$$namespaceBinding[overload1]$$$namespaceBindingconstQXmlName& -->
<h3 class="fn"><a name="namespaceBinding"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">namespaceBinding</span>(const <span class="type"><a href="qxmlname.html">QXmlName</a></span> &<i> name</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when a namespace binding is in scope of an element. A namespace is defined by a URI. In the <a href="qxmlname.html">QXmlName</a> <i>name</i>, the value of <a href="qxmlname.html#namespaceUri">QXmlName::namespaceUri</a>() is that URI. The value of <a href="qxmlname.html#prefix">QXmlName::prefix</a>() is the prefix that the URI is bound to. The local name is insignificant and can be an arbitrary value.</p>
<!-- @@@namespaceBinding -->
<!-- $$$processingInstruction[overload1]$$$processingInstructionconstQXmlName&constQString& -->
<h3 class="fn"><a name="processingInstruction"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">processingInstruction</span>(const <span class="type"><a href="qxmlname.html">QXmlName</a></span> &<i> target</i>, const <span class="type">QString</span> &<i> value</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when a processing instruction appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>. A processing instruction is used in an XML document to tell the application reading the document to perform some action. A typical example is to use a processing instruction to tell the application to use a particular XSLT stylesheet to process the document.</p>
<pre class="cpp"><?xml-stylesheet type="test/xsl" href="formatter.xsl"?></pre>
<p><i>target</i> is the <a href="qxmlname.html">name</a> of the processing instruction. Its <i>prefix</i> and <i>namespace URI</i> must both be empty. Its <i>local name</i> is the target. In the above example, the name is <i>xml-stylesheet</i>.</p>
<p>The <i>value</i> specifies the action to be taken. Note that the <i>value</i> must not contain the string "?>". In the above example, the <i>value</i> is <i>type="test/xsl" href="formatter.xsl</i>.</p>
<p>Generally, use of processing instructions should be avoided, because they are not namespace aware and in many contexts are stripped out anyway. Processing instructions can often be replaced with elements from a custom namespace.</p>
<!-- @@@processingInstruction -->
<!-- $$$startDocument[overload1]$$$startDocument -->
<h3 class="fn"><a name="startDocument"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">startDocument</span>()<tt> [pure virtual]</tt></h3>
<p>This callback is called when a document node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>.</p>
<!-- @@@startDocument -->
<!-- $$$startElement[overload1]$$$startElementconstQXmlName& -->
<h3 class="fn"><a name="startElement"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">startElement</span>(const <span class="type"><a href="qxmlname.html">QXmlName</a></span> &<i> name</i>)<tt> [pure virtual]</tt></h3>
<p>This callback is called when a new element node appears in the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a>. <i>name</i> is the valid <a href="qxmlname.html">name</a> of the node element.</p>
<!-- @@@startElement -->
<!-- $$$startOfSequence[overload1]$$$startOfSequence -->
<h3 class="fn"><a name="startOfSequence"></a><span class="type">void</span> QAbstractXmlReceiver::<span class="name">startOfSequence</span>()<tt> [pure virtual]</tt></h3>
<p>This callback is called once only, right before the <a href="qabstractxmlreceiver.html#xquery-sequence">sequence</a> begins.</p>
<!-- @@@startOfSequence -->
</div>
</div>
</div>
</div>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its
subsidiaries. Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Digia, Qt and their respective logos are trademarks of Digia Plc in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. </p>
</div>
</body>
</html>
|