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<h1>Soprano::Iterator< T > Class Template Reference</h1> </div>
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<!-- doxytag: class="Soprano::Iterator" --><!-- doxytag: inherits="Soprano::Error::ErrorCache" -->
<p>The basic Soprano iterator class.
<a href="#_details">More...</a></p>
<p><code>#include <<a class="el" href="iterator_8h_source.html">Soprano/Iterator</a>></code></p>
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<img id="dynsection-0-trigger" src="closed.png"/> Inheritance diagram for Soprano::Iterator< T >:</div>
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<map name="Soprano_1_1Iterator_3_01T_01_4_inherit__map" id="Soprano_1_1Iterator_3_01T_01_4_inherit__map">
<area shape="rect" id="node5" href="classSoprano_1_1Iterator.html" title="Soprano::Iterator\< Node \>" alt="" coords="543,76,716,105"/><area shape="rect" id="node13" href="classSoprano_1_1Iterator.html" title="Soprano::Iterator\< Statement \>" alt="" coords="528,156,731,185"/><area shape="rect" id="node21" href="classSoprano_1_1Iterator.html" title="Soprano::Iterator\< BindingSet \>" alt="" coords="527,216,732,245"/><area shape="rect" id="node2" href="classSoprano_1_1Error_1_1ErrorCache.html" title="Core class of Soprano's exception system." alt="" coords="7,156,185,185"/><area shape="rect" id="node7" href="classSoprano_1_1NodeIterator.html" title="An iterator that provides a stream of Nodes." alt="" coords="805,59,955,88"/><area shape="rect" id="node9" href="classSoprano_1_1Client_1_1DBusNodeIterator.html" title="Interface to a DBus server node iterator." alt="" coords="1048,5,1272,35"/><area shape="rect" id="node11" href="classSoprano_1_1Util_1_1SimpleNodeIterator.html" title="The most simple version of a NodeIterator simply iterates over a list of Nodes." alt="" coords="1051,59,1269,88"/><area shape="rect" id="node15" href="classSoprano_1_1StatementIterator.html" title="An iterator that provides a stream of Statements." alt="" coords="791,156,969,185"/><area shape="rect" id="node17" href="classSoprano_1_1Client_1_1DBusStatementIterator.html" title="Interface to a DBus server statement iterator." alt="" coords="1033,112,1287,141"/><area shape="rect" id="node19" href="classSoprano_1_1Util_1_1SimpleStatementIterator.html" title="The most simple version of a StatementIterator simply iterates over a list of Statements." alt="" coords="1037,165,1283,195"/><area shape="rect" id="node23" href="classSoprano_1_1QueryResultIterator.html" title="An iterator for query results." alt="" coords="784,216,976,245"/><area shape="rect" id="node25" href="classSoprano_1_1Client_1_1DBusQueryResultIterator.html" title="Interface to a DBus server query result iterator." alt="" coords="1027,219,1293,248"/></map>
<center><span class="legend">[<a href="graph_legend.html">legend</a>]</span></center></div>
<p><a href="classSoprano_1_1Iterator-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#af0cc2606052285dcd4ab3bd2f93377a2">Iterator</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a8603764eaec13eb7670b8c0229cdab00">Iterator</a> (<a class="el" href="classSoprano_1_1IteratorBackend.html">IteratorBackend</a>< T > *sti)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a6660a517b9bdb993a61df8ff41fa2c75">Iterator</a> (const <a class="el" href="classSoprano_1_1Iterator.html">Iterator</a> &sti)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a1b46cffbe390bd0e23cdda417c6ad845">~Iterator</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classSoprano_1_1Iterator.html">Iterator</a> & </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a1c83515d4e73f9603d3b84a647fee5de">operator=</a> (const <a class="el" href="classSoprano_1_1Iterator.html">Iterator</a> &)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a623fb6440a6cfadbb560bd7738c01871">close</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">T </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a7060834a96aced1bba25e760474ac22e">current</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">T </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a5b6240c9f5f7686ce76e4eb2a39f6f9f">operator*</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a03d741ebdc499352fa85b38835825f6a">isValid</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="elRef" href="qlist.html">QList</a>< T > </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#ab8f53c8b02072c3e688ee62e5f318b46">allElements</a> ()</td></tr>
<tr><td colspan="2"><h2><a name="pro-methods"></a>
Protected Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#a27a5362ea770284c1a83d5b432f8a59b">setBackend</a> (<a class="el" href="classSoprano_1_1IteratorBackend.html">IteratorBackend</a>< T > *b)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classSoprano_1_1IteratorBackend.html">IteratorBackend</a>< T > * </td><td class="memItemRight" valign="bottom"><a class="el" href="classSoprano_1_1Iterator.html#aff7df72a54da0b2dee48f1a1b59e0ac8">backend</a> () const </td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><h3>template<typename T><br/>
class Soprano::Iterator< T ></h3>
<p>The basic Soprano iterator class. </p>
<p>Iterators in Soprano are very easy to use through two methods <a class="el" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next()</a> and <a class="el" href="classSoprano_1_1Iterator.html#a7060834a96aced1bba25e760474ac22e">current()</a>. Instead of the latter <a class="el" href="classSoprano_1_1Iterator.html#a5b6240c9f5f7686ce76e4eb2a39f6f9f">operator*()</a> can also be used. Both can be called subsequetially to retrieve the current element until <a class="el" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next()</a> has been called again.</p>
<div class="fragment"><pre class="fragment"> <a class="code" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Soprano::Iterator<X></a> it;
<span class="keywordflow">while</span>( it.<a class="code" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next</a>() ) {
doSomething( *it );
doSomethingElse( it.<a class="code" href="classSoprano_1_1Iterator.html#a7060834a96aced1bba25e760474ac22e">current</a>() );
}
</pre></div><p>Many backends do lock the underlying <a class="el" href="classSoprano_1_1Model.html" title="A Model is the central class in Soprano. It is a queryable collection of RDF quadruples, i.e statements.">Model</a> during iteration. Thus, it is always a good idea to cache the results if they are to be used to modify the model to prevent a deadlock:</p>
<div class="fragment"><pre class="fragment"> <a class="code" href="classSoprano_1_1StatementIterator.html" title="An iterator that provides a stream of Statements.">Soprano::StatementIterator</a> it = model-><a class="code" href="classSoprano_1_1Model.html#a7f50dc6483e0bed7830877182c7906ac">listStatements</a>();
<a class="codeRef" href="qlist.html">QList<Statement></a> allStatements = it.<a class="code" href="classSoprano_1_1Iterator.html#ab8f53c8b02072c3e688ee62e5f318b46">allElements</a>();
Q_FOREACH( <a class="code" href="classSoprano_1_1Statement.html" title="A Statement instance represents one RDF quadruple.">Soprano::Statement</a> s, allStatements ) {
modifyTheModel( model, s );
}
</pre></div><p>Iterators have to be closed. This can either be achieved by deleting the iterator, finishing it (<a class="el" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next()</a> does return <code>false</code>), or calling <a class="el" href="classSoprano_1_1Iterator.html#a623fb6440a6cfadbb560bd7738c01871">close()</a>. Before that other operations on the <a class="el" href="classSoprano_1_1Model.html" title="A Model is the central class in Soprano. It is a queryable collection of RDF quadruples, i.e statements.">Model</a> may block.</p>
<p>Iterators are not thread-safe. Two threads using the same iterator may result in undefined behaviour and even crashes. An iterator needs to be closed by the same thread that opened it (except if the iterator contains special code to handle such a situation.)</p>
<dl class="warning"><dt><b>Warning:</b></dt><dd>Be aware that iterators in <a class="el" href="namespaceSoprano.html">Soprano</a> are shared objects which means that copies of one iterator object work on the same data.</dd></dl>
<dl class="author"><dt><b>Author:</b></dt><dd>Daniele Galdi <<a href="mailto:daniele.galdi@gmail.com">daniele.galdi@gmail.com</a>><br/>
Sebastian Trueg <<a href="mailto:trueg@kde.org">trueg@kde.org</a>> </dd></dl>
<p>Definition at line <a class="el" href="iterator_8h_source.html#l00079">79</a> of file <a class="el" href="iterator_8h_source.html">iterator.h</a>.</p>
</div><hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="af0cc2606052285dcd4ab3bd2f93377a2"></a><!-- doxytag: member="Soprano::Iterator::Iterator" ref="af0cc2606052285dcd4ab3bd2f93377a2" args="()" -->
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<p>Creates and empty, invalid iterator. </p>
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<td>(</td>
<td class="paramtype"><a class="el" href="classSoprano_1_1IteratorBackend.html">IteratorBackend</a>< T > * </td>
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<p>Create a new <a class="el" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Iterator</a> instance that uses sti as backend. <a class="el" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Iterator</a> will take ownership of the backend. </p>
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<a class="anchor" id="a6660a517b9bdb993a61df8ff41fa2c75"></a><!-- doxytag: member="Soprano::Iterator::Iterator" ref="a6660a517b9bdb993a61df8ff41fa2c75" args="(const Iterator &sti)" -->
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<td class="memname">virtual <a class="el" href="classSoprano_1_1Iterator.html">Soprano::Iterator</a>< T >::~<a class="el" href="classSoprano_1_1Iterator.html">Iterator</a> </td>
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<td><code> [virtual]</code></td>
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<hr/><h2>Member Function Documentation</h2>
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<a class="anchor" id="a623fb6440a6cfadbb560bd7738c01871"></a><!-- doxytag: member="Soprano::Iterator::close" ref="a623fb6440a6cfadbb560bd7738c01871" args="()" -->
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<p>Close the iterator and release any locks on the underlying <a class="el" href="classSoprano_1_1Model.html" title="A Model is the central class in Soprano. It is a queryable collection of RDF quadruples, i.e statements.">Model</a>. </p>
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<p>Advances to the next element in the iterator. </p>
<dl class="return"><dt><b>Returns:</b></dt><dd>true if another element can be read from the iterator, false if the end has been reached. </dd></dl>
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<p>Get the element the iterator currently points to. Be aware that a valid current element is only available if <a class="el" href="classSoprano_1_1Iterator.html#a1ba632f6f015242ab9441da77d48415b">next()</a> returned <code>true</code>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>the current element. </dd></dl>
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<p>Retrieve the current element in the iterator.</p>
<p>This is equivalent to <a class="el" href="classSoprano_1_1Iterator.html#a7060834a96aced1bba25e760474ac22e">current()</a>.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>The element the iterator currently points to or an invalid one if next has never been called. </dd></dl>
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<dl class="return"><dt><b>Returns:</b></dt><dd><code>true</code> if the <a class="el" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Iterator</a> is valid, <code>false</code> otherwise. (An invalid iterator has no backend.) </dd></dl>
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<a class="anchor" id="ab8f53c8b02072c3e688ee62e5f318b46"></a><!-- doxytag: member="Soprano::Iterator::allElements" ref="ab8f53c8b02072c3e688ee62e5f318b46" args="()" -->
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<p>Convenience method which extracts all elements (this does not include the elements that have already been read from the iterator) from the iterator and returns them in a list.</p>
<p>Be aware that after calling this method the iterator will be invalid.</p>
<dl class="return"><dt><b>Returns:</b></dt><dd>A list of all elements that rest in the iterator. </dd></dl>
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<a class="anchor" id="a27a5362ea770284c1a83d5b432f8a59b"></a><!-- doxytag: member="Soprano::Iterator::setBackend" ref="a27a5362ea770284c1a83d5b432f8a59b" args="(IteratorBackend< T > *b)" -->
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<td class="memname">void <a class="el" href="classSoprano_1_1Iterator.html">Soprano::Iterator</a>< T >::setBackend </td>
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<p>Set the backend to read the actual data from. A previous backend will be deleted if there are no other <a class="el" href="classSoprano_1_1Iterator.html" title="The basic Soprano iterator class.">Iterator</a> instances using it. </p>
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<td class="memname"><a class="el" href="classSoprano_1_1IteratorBackend.html">IteratorBackend</a><T>* <a class="el" href="classSoprano_1_1Iterator.html">Soprano::Iterator</a>< T >::backend </td>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li>/builddir/build/BUILD/soprano-2.6.0/soprano/<a class="el" href="iterator_8h_source.html">iterator.h</a></li>
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<hr class="footer"/><address class="footer"><small>Generated on Fri Mar 11 2011 for Soprano by 
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.3 </small></address>
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