XQuilla/docs/dom3-api/dom-context-item_8cpp-example.html
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<h1>dom-context-item.cpp</h1>This example parses a document and sets it as the context item. It then executes an XQuery expression that navigates relative to the context item.<p>
<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;iostream&gt;</span>
<span class="preprocessor">#include &lt;<a class="code" href="DOM_8hpp.html">xercesc/dom/DOM.hpp</a>&gt;</span>
<span class="preprocessor">#include &lt;xercesc/framework/StdOutFormatTarget.hpp&gt;</span>
<span class="preprocessor">#include &lt;<a class="code" href="xqilla-dom3_8hpp.html">xqilla/xqilla-dom3.hpp</a>&gt;</span>
XERCES_CPP_NAMESPACE_USE;
<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[]) {
<span class="comment">// Initialise Xerces-C and XQilla using XQillaPlatformUtils</span>
<a name="a0"></a><a class="code" href="classXQillaPlatformUtils.html#c769d09556ec43ecb94d1822783ba0b8" title="Perform XQilla initialization.">XQillaPlatformUtils::initialize</a>();
<span class="comment">// Get the XQilla DOMImplementation object</span>
DOMImplementation *xqillaImplementation =
DOMImplementationRegistry::getDOMImplementation(X(<span class="stringliteral">"XPath2 3.0"</span>));
<span class="keywordflow">try</span> {
<span class="comment">// Create a DOMLSParser object</span>
<a name="_a1"></a><a class="code" href="classAutoRelease.html">AutoRelease&lt;DOMLSParser&gt;</a> parser(xqillaImplementation-&gt;createLSParser(DOMImplementationLS::MODE_SYNCHRONOUS, 0));
parser-&gt;getDomConfig()-&gt;setParameter(XMLUni::fgDOMNamespaces, <span class="keyword">true</span>);
parser-&gt;getDomConfig()-&gt;setParameter(XMLUni::fgXercesSchema, <span class="keyword">true</span>);
parser-&gt;getDomConfig()-&gt;setParameter(XMLUni::fgDOMValidateIfSchema, <span class="keyword">true</span>);
<span class="comment">// Parse a DOMDocument</span>
DOMDocument *document = parser-&gt;parseURI(<span class="stringliteral">"foo.xml"</span>);
<span class="keywordflow">if</span>(document == 0) {
std::cerr &lt;&lt; <span class="stringliteral">"Document not found."</span> &lt;&lt; std::endl;
<span class="keywordflow">return</span> 1;
}
<span class="comment">// Parse an XPath 2 expression</span>
<a class="code" href="classAutoRelease.html">AutoRelease&lt;DOMXPathExpression&gt;</a> expression(document-&gt;createExpression(X(<span class="stringliteral">"foo/bar/@baz"</span>), 0));
<span class="comment">// Execute the query</span>
<a class="code" href="classAutoRelease.html">AutoRelease&lt;DOMXPathResult&gt;</a> result(expression-&gt;evaluate(document, DOMXPathResult::ITERATOR_RESULT_TYPE, 0));
<span class="comment">// Create a DOMLSSerializer to output the nodes</span>
<a class="code" href="classAutoRelease.html">AutoRelease&lt;DOMLSSerializer&gt;</a> serializer(xqillaImplementation-&gt;createLSSerializer());
<a class="code" href="classAutoRelease.html">AutoRelease&lt;DOMLSOutput&gt;</a> output(xqillaImplementation-&gt;createLSOutput());
StdOutFormatTarget target;
output-&gt;setByteStream(&amp;target);
<span class="comment">// Iterate over the results, printing them</span>
<span class="keywordflow">while</span>(result-&gt;iterateNext()) {
serializer-&gt;write(result-&gt;getNodeValue(), output);
std::cout &lt;&lt; std::endl;
}
}
<span class="keywordflow">catch</span>(XQillaException &amp;e) {
std::cerr &lt;&lt; <span class="stringliteral">"XQillaException: "</span> &lt;&lt; UTF8(e.getString()) &lt;&lt; std::endl;
<span class="keywordflow">return</span> 1;
}
<span class="comment">// Terminate Xerces-C and XQilla using XQillaPlatformUtils</span>
<a name="a2"></a><a class="code" href="classXQillaPlatformUtils.html#0bd04a35d4cb26894497c6ff4d8e2105" title="Perform XQilla termination.">XQillaPlatformUtils::terminate</a>();
<span class="keywordflow">return</span> 0;
}
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