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<a href="#id2572026" class="shortcut">Description</a></nobr></td></tr>
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<h2>
<a name="id2613282"></a><span class="refentrytitle">Triples Source</span>
</h2>
<p>Triples Source — Source of matches to a triple pattern.</p>
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<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">
typedef <a href="rasqal-section-triples-source.html#rasqal-triples-match">rasqal_triples_match</a>;
typedef <a href="rasqal-section-triples-source.html#rasqal-triples-source">rasqal_triples_source</a>;
<a href="rasqal-section-triples-source.html#rasqal-triples-source-factory">rasqal_triples_source_factory</a>;
void <a href="rasqal-section-triples-source.html#rasqal-set-triples-source-factory">rasqal_set_triples_source_factory</a>
(void (*register_fn) (rasqal_triples_source_factory *factory),
void *user_data);
</pre>
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<div class="refsect1" lang="en">
<a name="id2572026"></a><h2>Description</h2>
<p>
A factory that provides the raw triple matches for a triple pattern
against some RDF graph. The <a href="rasqal-section-triples-source.html#rasqal-triples-source-factory"><span class="type">rasqal_triples_source_factory</span></a>
must create use a new <a href="rasqal-section-triples-source.html#rasqal-triples-source"><span class="type">rasqal_triples_source</span></a> that can be used
to initialise and build a <a href="rasqal-section-triples-source.html#rasqal-triples-match"><span class="type">rasqal_triples_match</span></a> for some
<a href="rasqal-section-triple.html#rasqal-triple"><span class="type">rasqal_triple</span></a> (subject, predicate, object, origin URI).
</p>
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<div class="refsect1" lang="en">
<a name="id2572070"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="id2572080"></a><h3>
<a name="rasqal-triples-match"></a>rasqal_triples_match</h3>
<a class="indexterm" name="id2572091"></a><pre class="programlisting">typedef struct rasqal_triples_match_s rasqal_triples_match;
</pre>
<p>
Triples match structure as initialised by <a href="rasqal-section-triples-source.html#rasqal-triples-source"><span class="type">rasqal_triples_source</span></a>
method init_triples_match.</p>
<p>
</p>
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<div class="refsect2" lang="en">
<a name="id2572116"></a><h3>
<a name="rasqal-triples-source"></a>rasqal_triples_source</h3>
<a class="indexterm" name="id2607359"></a><pre class="programlisting">typedef struct rasqal_triples_source_s rasqal_triples_source;
</pre>
<p>
Triples source as initialised by a <a href="rasqal-section-triples-source.html#rasqal-triples-source-factory"><span class="type">rasqal_triples_source_factory</span></a>.</p>
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</p>
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<div class="refsect2" lang="en">
<a name="id2607385"></a><h3>
<a name="rasqal-triples-source-factory"></a>rasqal_triples_source_factory</h3>
<a class="indexterm" name="id2607396"></a><pre class="programlisting">typedef struct {
void *user_data;
size_t user_data_size;
int (*new_triples_source)(rasqal_query* query, void *factory_user_data, void *user_data, rasqal_triples_source* rts);
} rasqal_triples_source_factory;
</pre>
<p>
A factory that initialises <a href="rasqal-section-triples-source.html#rasqal-triples-source"><span class="type">rasqal_triples_source</span></a> structures
to returning matches to a triple pattern.</p>
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<td><span class="term">void *<em class="structfield"><code>user_data</code></em>;</span></td>
<td> User data for triples_source_factory.
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<td><span class="term">size_t <em class="structfield"><code>user_data_size</code></em>;</span></td>
<td> Size Of <em class="parameter"><code>user_data</code></em> for new_triples_source.
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<td><span class="term"><em class="structfield"><code>new_triples_source</code></em> ()</span></td>
<td> Create a new triples source - returns non-zero on failure < 0 is a 'no rdf data error', > 0 is an unspecified error..
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<div class="refsect2" lang="en">
<a name="id2555996"></a><h3>
<a name="rasqal-set-triples-source-factory"></a>rasqal_set_triples_source_factory ()</h3>
<a class="indexterm" name="id2556008"></a><pre class="programlisting">void rasqal_set_triples_source_factory
(void (*register_fn) (rasqal_triples_source_factory *factory),
void *user_data);</pre>
<p>
Register the factory to return triple sources.
</p>
<p>
Registers the factory that returns triples sources. Note that
there is only one of these per runtime.
</p>
<p>
The rasqal_triples_source_factory factory method new_triples_source is
called with the user data for some query and rasqal_triples_source.</p>
<p>
</p>
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<td><span class="term"><em class="parameter"><code>register_fn</code></em> :</span></td>
<td> registration function
</td>
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<td><span class="term"><em class="parameter"><code>user_data</code></em> :</span></td>
<td> user data for registration
</td>
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