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<a name="rasqal-section-triples-source"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="rasqal-section-triples-source.top_of_page"></a>Triples Source</span></h2>
<p>Triples Source — Source of matches to a triple pattern.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="rasqal-section-triples-source.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="rasqal-section-triples-source.html#rasqal-triple-meta" title="rasqal_triple_meta">rasqal_triple_meta</a>;
<a class="link" href="rasqal-section-triples-source.html#rasqal-triples-match" title="rasqal_triples_match">rasqal_triples_match</a>;
<a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source" title="rasqal_triples_source">rasqal_triples_source</a>;
<a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory" title="rasqal_triples_source_factory">rasqal_triples_source_factory</a>;
<span class="returnvalue">int</span> (<a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory-register-fn" title="rasqal_triples_source_factory_register_fn ()">*rasqal_triples_source_factory_register_fn</a>)
(<em class="parameter"><code><a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory" title="rasqal_triples_source_factory"><span class="type">rasqal_triples_source_factory</span></a> *factory</code></em>);
enum <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-feature" title="enum rasqal_triples_source_feature">rasqal_triples_source_feature</a>;
<span class="returnvalue">void</span> (<a class="link" href="rasqal-section-triples-source.html#rasqal-triples-error-handler" title="rasqal_triples_error_handler ()">*rasqal_triples_error_handler</a>) (<em class="parameter"><code><a class="link" href="rasqal-section-query.html#rasqal-query" title="rasqal_query"><span class="type">rasqal_query</span></a> *query</code></em>,
<em class="parameter"><code><span class="type">raptor_locator</span> *locator</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *message</code></em>);
<span class="returnvalue">int</span> <a class="link" href="rasqal-section-triples-source.html#rasqal-set-triples-source-factory" title="rasqal_set_triples_source_factory ()">rasqal_set_triples_source_factory</a> (<em class="parameter"><code><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *world</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory-register-fn" title="rasqal_triples_source_factory_register_fn ()"><span class="type">rasqal_triples_source_factory_register_fn</span></a> register_fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);
#define <a class="link" href="rasqal-section-triples-source.html#RASQAL-TRIPLES-SOURCE-FACTORY-MIN-VERSION:CAPS" title="RASQAL_TRIPLES_SOURCE_FACTORY_MIN_VERSION">RASQAL_TRIPLES_SOURCE_FACTORY_MIN_VERSION</a>
#define <a class="link" href="rasqal-section-triples-source.html#RASQAL-TRIPLES-SOURCE-FACTORY-MAX-VERSION:CAPS" title="RASQAL_TRIPLES_SOURCE_FACTORY_MAX_VERSION">RASQAL_TRIPLES_SOURCE_FACTORY_MAX_VERSION</a>
#define <a class="link" href="rasqal-section-triples-source.html#RASQAL-TRIPLES-SOURCE-MIN-VERSION:CAPS" title="RASQAL_TRIPLES_SOURCE_MIN_VERSION">RASQAL_TRIPLES_SOURCE_MIN_VERSION</a>
#define <a class="link" href="rasqal-section-triples-source.html#RASQAL-TRIPLES-SOURCE-MAX-VERSION:CAPS" title="RASQAL_TRIPLES_SOURCE_MAX_VERSION">RASQAL_TRIPLES_SOURCE_MAX_VERSION</a>
</pre>
</div>
<div class="refsect1">
<a name="rasqal-section-triples-source.description"></a><h2>Description</h2>
<p>
A factory that provides the raw triple matches for a triple pattern
against some RDF graph. The <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory" title="rasqal_triples_source_factory"><span class="type">rasqal_triples_source_factory</span></a>
must create use a new <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source" title="rasqal_triples_source"><span class="type">rasqal_triples_source</span></a> that can be used
to initialise and build a <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-match" title="rasqal_triples_match"><span class="type">rasqal_triples_match</span></a> for some
<a class="link" href="rasqal-section-triple.html#rasqal-triple" title="rasqal_triple"><span class="type">rasqal_triple</span></a> (subject, predicate, object, origin URI).
</p>
</div>
<div class="refsect1">
<a name="rasqal-section-triples-source.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="rasqal-triple-meta"></a><h3>rasqal_triple_meta</h3>
<pre class="programlisting">typedef struct {
/* triple (subject, predicate, object) and origin */
rasqal_variable* bindings[4];
rasqal_triples_match *triples_match;
void *context;
rasqal_triple_parts parts;
int is_exact;
int executed;
} rasqal_triple_meta;
</pre>
<p>
Metadata for triple pattern matching for one triple pattern.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-variable.html#rasqal-variable" title="rasqal_variable"><span class="type">rasqal_variable</span></a> *<em class="structfield"><code><a name="rasqal-triple-meta.bindings"></a>bindings</code></em>[4];</span></p></td>
<td>Variable bindings for this triple+origin to set.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-triples-source.html#rasqal-triples-match" title="rasqal_triples_match"><span class="type">rasqal_triples_match</span></a> *<em class="structfield"><code><a name="rasqal-triple-meta.triples-match"></a>triples_match</code></em>;</span></p></td>
<td>The matcher that is setting these bindings.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">void</span> *<em class="structfield"><code><a name="rasqal-triple-meta.context"></a>context</code></em>;</span></p></td>
<td>Context data used by the matcher.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-triple.html#rasqal-triple-parts" title="enum rasqal_triple_parts"><span class="type">rasqal_triple_parts</span></a> <em class="structfield"><code><a name="rasqal-triple-meta.parts"></a>parts</code></em>;</span></p></td>
<td>Bitmask of <a class="link" href="rasqal-section-triple.html#rasqal-triple-parts" title="enum rasqal_triple_parts"><span class="type">rasqal_triple_parts</span></a> flags describing the parts of the triple pattern that will bind to variables. There may also be variables mentioned that are bound in other triple patterns even if <em class="parameter"><code>parts</code></em> is 0.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-triple-meta.is-exact"></a>is_exact</code></em>;</span></p></td>
<td>unused</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-triple-meta.executed"></a>executed</code></em>;</span></p></td>
<td>unused</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triples-match"></a><h3>rasqal_triples_match</h3>
<pre class="programlisting">typedef struct {
void *user_data;
rasqal_triple_parts (*bind_match)(struct rasqal_triples_match_s* rtm, void *user_data, rasqal_variable *bindings[4], rasqal_triple_parts parts);
void (*next_match)(struct rasqal_triples_match_s* rtm, void *user_data);
int (*is_end)(struct rasqal_triples_match_s* rtm, void *user_data);
void (*finish)(struct rasqal_triples_match_s* rtm, void *user_data);
rasqal_world *world;
} rasqal_triples_match;
</pre>
<p>
Triples match structure as initialised by <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source" title="rasqal_triples_source"><span class="type">rasqal_triples_source</span></a>
method init_triples_match.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">void</span> *<em class="structfield"><code><a name="rasqal-triples-match.user-data"></a>user_data</code></em>;</span></p></td>
<td>User data pointer for factory methods.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-match.bind-match"></a>bind_match</code></em> ()</span></p></td>
<td>The [4]array (s,p,o,origin) bindings against the current triple match only touching triple parts given. Returns parts that were bound or 0 on failure.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-match.next-match"></a>next_match</code></em> ()</span></p></td>
<td>Move to next match.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-match.is-end"></a>is_end</code></em> ()</span></p></td>
<td>Check for end of triple match - return non-0 if is end.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-match.finish"></a>finish</code></em> ()</span></p></td>
<td>Finish triples match and destroy any allocated memory.</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *<em class="structfield"><code><a name="rasqal-triples-match.world"></a>world</code></em>;</span></p></td>
<td>rasqal_world object</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triples-source"></a><h3>rasqal_triples_source</h3>
<pre class="programlisting">typedef struct {
rasqal_query* query;
void *user_data;
int (*init_triples_match)(rasqal_triples_match* rtm, struct rasqal_triples_source_s* rts, void *user_data, rasqal_triple_meta *m, rasqal_triple *t);
int (*triple_present)(struct rasqal_triples_source_s* rts, void *user_data, rasqal_triple *t);
void (*free_triples_source)(void *user_data);
} rasqal_triples_source;
</pre>
<p>
Triples source as initialised by a <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory" title="rasqal_triples_source_factory"><span class="type">rasqal_triples_source_factory</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="rasqal-section-query.html#rasqal-query" title="rasqal_query"><span class="type">rasqal_query</span></a> *<em class="structfield"><code><a name="rasqal-triples-source.query"></a>query</code></em>;</span></p></td>
<td>Source for this query.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">void</span> *<em class="structfield"><code><a name="rasqal-triples-source.user-data"></a>user_data</code></em>;</span></p></td>
<td>Context user data passed into the factory methods.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-source.init-triples-match"></a>init_triples_match</code></em> ()</span></p></td>
<td>Factory method to initalise a new <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-match" title="rasqal_triples_match"><span class="type">rasqal_triples_match</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-source.triple-present"></a>triple_present</code></em> ()</span></p></td>
<td>Factory method to return presence or absence of a complete triple.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-source.free-triples-source"></a>free_triples_source</code></em> ()</span></p></td>
<td>Factory method to deallocate resources.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triples-source-factory"></a><h3>rasqal_triples_source_factory</h3>
<pre class="programlisting">typedef struct {
int version;
void *user_data;
size_t user_data_size;
/* API v1 */
int (*new_triples_source)(rasqal_query* query, void *factory_user_data, void *user_data, rasqal_triples_source* rts);
/* API v2 onwards */
int (*init_triples_source)(rasqal_query* query, void *factory_user_data, void *user_data, rasqal_triples_source* rts, rasqal_triples_error_handler handler);
} rasqal_triples_source_factory;
</pre>
<p>
A factory that initialises <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source" title="rasqal_triples_source"><span class="type">rasqal_triples_source</span></a> structures to
returning matches to a triple pattern across the dataset formed
from the data graphs recorded in the <em class="parameter"><code>query</code></em> object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">int</span> <em class="structfield"><code><a name="rasqal-triples-source-factory.version"></a>version</code></em>;</span></p></td>
<td>API factory version from 1 to 2</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">void</span> *<em class="structfield"><code><a name="rasqal-triples-source-factory.user-data"></a>user_data</code></em>;</span></p></td>
<td>User data for triples_source_factory.</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">size_t</span> <em class="structfield"><code><a name="rasqal-triples-source-factory.user-data-size"></a>user_data_size</code></em>;</span></p></td>
<td>Size of <em class="parameter"><code>user_data</code></em> for new_triples_source.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-source-factory.new-triples-source"></a>new_triples_source</code></em> ()</span></p></td>
<td>Create a new triples source - returns non-zero on failure < 0 is a 'no rdf data error', > 0 is an unspecified error. Error messages are generated by rasqal internally. (V1)</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="rasqal-triples-source-factory.init-triples-source"></a>init_triples_source</code></em> ()</span></p></td>
<td>Initialise a new triples source V2 for a particular source URI/base URI and syntax. Returns non-zero on failure with errors reported via the handler callback by the implementation. (V2)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triples-source-factory-register-fn"></a><h3>rasqal_triples_source_factory_register_fn ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> (*rasqal_triples_source_factory_register_fn)
(<em class="parameter"><code><a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory" title="rasqal_triples_source_factory"><span class="type">rasqal_triples_source_factory</span></a> *factory</code></em>);</pre>
<p>
Register a factory for generating triples sources <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source" title="rasqal_triples_source"><span class="type">rasqal_triples_source</span></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>factory</code></em> :</span></p></td>
<td>factory to register</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-0 on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triples-source-feature"></a><h3>enum rasqal_triples_source_feature</h3>
<pre class="programlisting">typedef enum {
RASQAL_TRIPLES_SOURCE_FEATURE_NONE,
RASQAL_TRIPLES_SOURCE_FEATURE_IOSTREAM_DATA_GRAPH
} rasqal_triples_source_feature;
</pre>
<p>
Optional features that may be supported by a triple source factory
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="RASQAL-TRIPLES-SOURCE-FEATURE-NONE:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLES_SOURCE_FEATURE_NONE</code></span></p></td>
<td>No feature
</td>
</tr>
<tr>
<td><p><a name="RASQAL-TRIPLES-SOURCE-FEATURE-IOSTREAM-DATA-GRAPH:CAPS"></a><span class="term"><code class="literal">RASQAL_TRIPLES_SOURCE_FEATURE_IOSTREAM_DATA_GRAPH</code></span></p></td>
<td>Support raptor_iostream data graphs
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-triples-error-handler"></a><h3>rasqal_triples_error_handler ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*rasqal_triples_error_handler) (<em class="parameter"><code><a class="link" href="rasqal-section-query.html#rasqal-query" title="rasqal_query"><span class="type">rasqal_query</span></a> *query</code></em>,
<em class="parameter"><code><span class="type">raptor_locator</span> *locator</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *message</code></em>);</pre>
<p>
Triples source factory error handler callback.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>query</code></em> :</span></p></td>
<td>query object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>locator</code></em> :</span></p></td>
<td>error locator (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>error message</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-set-triples-source-factory"></a><h3>rasqal_set_triples_source_factory ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> rasqal_set_triples_source_factory (<em class="parameter"><code><a class="link" href="rasqal-section-general.html#rasqal-world" title="rasqal_world"><span class="type">rasqal_world</span></a> *world</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory-register-fn" title="rasqal_triples_source_factory_register_fn ()"><span class="type">rasqal_triples_source_factory_register_fn</span></a> register_fn</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);</pre>
<p>
Register a factory to generate triple sources.
</p>
<p>
Registers the factory that returns triples sources. Note that
there is only one of these per runtime.
</p>
<p>
The <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source-factory" title="rasqal_triples_source_factory"><span class="type">rasqal_triples_source_factory</span></a> factory method new_triples_source is
called with the user data for some query and <a class="link" href="rasqal-section-triples-source.html#rasqal-triples-source" title="rasqal_triples_source"><span class="type">rasqal_triples_source</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>world</code></em> :</span></p></td>
<td>rasqal_world object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>register_fn</code></em> :</span></p></td>
<td>registration function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data for registration</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-zero on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="RASQAL-TRIPLES-SOURCE-FACTORY-MIN-VERSION:CAPS"></a><h3>RASQAL_TRIPLES_SOURCE_FACTORY_MIN_VERSION</h3>
<pre class="programlisting">#define RASQAL_TRIPLES_SOURCE_FACTORY_MIN_VERSION 1
</pre>
<p>
Lowest accepted <em class="parameter"><code>rasqal_triples_source_factory</code></em> API version
</p>
</div>
<hr>
<div class="refsect2">
<a name="RASQAL-TRIPLES-SOURCE-FACTORY-MAX-VERSION:CAPS"></a><h3>RASQAL_TRIPLES_SOURCE_FACTORY_MAX_VERSION</h3>
<pre class="programlisting">#define RASQAL_TRIPLES_SOURCE_FACTORY_MAX_VERSION 2
</pre>
<p>
Highest accepted <em class="parameter"><code>rasqal_triples_source_factory</code></em> API version
</p>
</div>
<hr>
<div class="refsect2">
<a name="RASQAL-TRIPLES-SOURCE-MIN-VERSION:CAPS"></a><h3>RASQAL_TRIPLES_SOURCE_MIN_VERSION</h3>
<pre class="programlisting">#define RASQAL_TRIPLES_SOURCE_MIN_VERSION 1
</pre>
<p>
Lowest accepted <em class="parameter"><code>rasqal_triples_source</code></em> API version
</p>
</div>
<hr>
<div class="refsect2">
<a name="RASQAL-TRIPLES-SOURCE-MAX-VERSION:CAPS"></a><h3>RASQAL_TRIPLES_SOURCE_MAX_VERSION</h3>
<pre class="programlisting">#define RASQAL_TRIPLES_SOURCE_MAX_VERSION 2
</pre>
<p>
Highest accepted <em class="parameter"><code>rasqal_triples_source</code></em> API version
</p>
</div>
</div>
</div>
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