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<a href="#rasqal-section-query-results-formatter.description" class="shortcut">Description</a>
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<a name="rasqal-section-query-results-formatter"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="rasqal-section-query-results-formatter.top_of_page"></a>Query Results Formatter</span></h2>
<p>Query Results Formatter — Query results formatted into a syntax.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="rasqal-section-query-results-formatter.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">typedef <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter">rasqal_query_results_formatter</a>;
enum <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-format-flags" title="enum rasqal_query_results_format_flags">rasqal_query_results_format_flags</a>;
<span class="returnvalue">int</span> <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formats-check" title="rasqal_query_results_formats_check ()">rasqal_query_results_formats_check</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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *uri</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code><span class="type">int</span> flags</code></em>);
<a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="returnvalue">rasqal_query_results_formatter</span></a> * <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-new-query-results-formatter" title="rasqal_new_query_results_formatter ()">rasqal_new_query_results_formatter</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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *format_uri</code></em>);
<a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="returnvalue">rasqal_query_results_formatter</span></a> * <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-new-query-results-formatter-for-content" title="rasqal_new_query_results_formatter_for_content ()">rasqal_new_query_results_formatter_for_content</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><span class="type">raptor_uri</span> *uri</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *buffer</code></em>,
<em class="parameter"><code><span class="type">size_t</span> len</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *identifier</code></em>);
<span class="returnvalue">void</span> <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-free-query-results-formatter" title="rasqal_free_query_results_formatter ()">rasqal_free_query_results_formatter</a> (<em class="parameter"><code><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> *formatter</code></em>);
<span class="returnvalue">int</span> <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter-read" title="rasqal_query_results_formatter_read ()">rasqal_query_results_formatter_read</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><span class="type">raptor_iostream</span> *iostr</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> *formatter</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results.html#rasqal-query-results" title="rasqal_query_results"><span class="type">rasqal_query_results</span></a> *results</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *base_uri</code></em>);
<span class="returnvalue">int</span> <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter-write" title="rasqal_query_results_formatter_write ()">rasqal_query_results_formatter_write</a>
(<em class="parameter"><code><span class="type">raptor_iostream</span> *iostr</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> *formatter</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results.html#rasqal-query-results" title="rasqal_query_results"><span class="type">rasqal_query_results</span></a> *results</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *base_uri</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="rasqal-section-query-results-formatter.description"></a><h2>Description</h2>
<p>
Variable bindings and boolean query results can be formatted into
different syntaxes such as SPARQL Query Results Format or JSON.
The rasqal_query_results_formatter class allows choosing a formatter
for a particular syntax and writing the syntax to a raptor_iostream
which allows turning the syntax into a string, writing to a file
handle or other custom destination.
</p>
</div>
<div class="refsect1">
<a name="rasqal-section-query-results-formatter.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="rasqal-query-results-formatter"></a><h3>rasqal_query_results_formatter</h3>
<pre class="programlisting">rasqal_graph_query_results_formatter* query_results_formatter;
</pre>
<p>
Rasqal query results formatter class.
</p>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-query-results-format-flags"></a><h3>enum rasqal_query_results_format_flags</h3>
<pre class="programlisting">typedef enum {
RASQAL_QUERY_RESULTS_FORMAT_FLAG_READER = 1,
RASQAL_QUERY_RESULTS_FORMAT_FLAG_WRITER = 2
} rasqal_query_results_format_flags;
</pre>
<p>
Bitflags for <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formats-check" title="rasqal_query_results_formats_check ()"><code class="function">rasqal_query_results_formats_check()</code></a> to find formats with features.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="RASQAL-QUERY-RESULTS-FORMAT-FLAG-READER:CAPS"></a><span class="term"><code class="literal">RASQAL_QUERY_RESULTS_FORMAT_FLAG_READER</code></span></p></td>
<td>format can be read.
</td>
</tr>
<tr>
<td><p><a name="RASQAL-QUERY-RESULTS-FORMAT-FLAG-WRITER:CAPS"></a><span class="term"><code class="literal">RASQAL_QUERY_RESULTS_FORMAT_FLAG_WRITER</code></span></p></td>
<td>format can be written.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-query-results-formats-check"></a><h3>rasqal_query_results_formats_check ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> rasqal_query_results_formats_check (<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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *uri</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code><span class="type">int</span> flags</code></em>);</pre>
<p>
Check if a query results formatter exists for the requested format.
</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>name</code></em> :</span></p></td>
<td>the query results format name (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>uri</code></em> :</span></p></td>
<td>
<span class="type">raptor_uri</span> query results format uri (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mime_type</code></em> :</span></p></td>
<td>mime type name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flags</code></em> :</span></p></td>
<td>bitmask of flags to signify that format is needed for reading (<a class="link" href="rasqal-section-query-results-formatter.html#RASQAL-QUERY-RESULTS-FORMAT-FLAG-READER:CAPS"><span class="type">RASQAL_QUERY_RESULTS_FORMAT_FLAG_READER</span></a> ) or writing ( <a class="link" href="rasqal-section-query-results-formatter.html#RASQAL-QUERY-RESULTS-FORMAT-FLAG-WRITER:CAPS"><span class="type">RASQAL_QUERY_RESULTS_FORMAT_FLAG_WRITER</span></a> )</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non-0 if a formatter exists.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-query-results-formatter"></a><h3>rasqal_new_query_results_formatter ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="returnvalue">rasqal_query_results_formatter</span></a> * rasqal_new_query_results_formatter
(<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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *format_uri</code></em>);</pre>
<p>
Constructor - create a new rasqal_query_results_formatter for an identified format.
</p>
<p>
A query results format can be found by name, mime type or URI, all
of which are optional. If multiple fields are given, the first
match is given that matches the name, URI, mime_type in that
order. The default query results format will be used if all are
format identifying fields are NULL.
</p>
<p>
See <a class="link" href="rasqal-section-general.html#rasqal-world-get-query-results-format-description" title="rasqal_world_get_query_results_format_description ()"><code class="function">rasqal_world_get_query_results_format_description()</code></a> for
obtaining the supported format URIs at run time.
</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>name</code></em> :</span></p></td>
<td>the query results format name (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mime_type</code></em> :</span></p></td>
<td>the query results format mime type (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format_uri</code></em> :</span></p></td>
<td>
<span class="type">raptor_uri</span> query results format uri (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-new-query-results-formatter-for-content"></a><h3>rasqal_new_query_results_formatter_for_content ()</h3>
<pre class="programlisting"><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="returnvalue">rasqal_query_results_formatter</span></a> * rasqal_new_query_results_formatter_for_content
(<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><span class="type">raptor_uri</span> *uri</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *mime_type</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *buffer</code></em>,
<em class="parameter"><code><span class="type">size_t</span> len</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *identifier</code></em>);</pre>
<p>
Constructor - create a new queryresults formatter for an identified format.
</p>
<p>
Uses <a class="link" href="rasqal-section-general.html#rasqal-world-guess-query-results-format-name" title="rasqal_world_guess_query_results_format_name ()"><code class="function">rasqal_world_guess_query_results_format_name()</code></a> to find a
query results formatter by scoring recognition of the syntax by a
block of characters, the content identifier or a mime type. The
content identifier is typically a filename or URI or some other
identifier.
</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>world object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>uri</code></em> :</span></p></td>
<td>URI identifying the syntax (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mime_type</code></em> :</span></p></td>
<td>mime type identifying the content (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>buffer of content to guess (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>len</code></em> :</span></p></td>
<td>length of buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>identifier</code></em> :</span></p></td>
<td>identifier of content (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-free-query-results-formatter"></a><h3>rasqal_free_query_results_formatter ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> rasqal_free_query_results_formatter (<em class="parameter"><code><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> *formatter</code></em>);</pre>
<p>
Destructor - destroy a <a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>formatter</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="rasqal-query-results-formatter-read"></a><h3>rasqal_query_results_formatter_read ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> rasqal_query_results_formatter_read (<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><span class="type">raptor_iostream</span> *iostr</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> *formatter</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results.html#rasqal-query-results" title="rasqal_query_results"><span class="type">rasqal_query_results</span></a> *results</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *base_uri</code></em>);</pre>
<p>
Read the query results using the given formatter from an iostream
</p>
<p>
See <a class="link" href="rasqal-section-general.html#rasqal-world-get-query-results-format-description" title="rasqal_world_get_query_results_format_description ()"><code class="function">rasqal_world_get_query_results_format_description()</code></a> for
obtaining the supported format URIs at run time.
</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>iostr</code></em> :</span></p></td>
<td>
<span class="type">raptor_iostream</span> to read the query from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>formatter</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>results</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-query-results.html#rasqal-query-results" title="rasqal_query_results"><span class="type">rasqal_query_results</span></a> query results format</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>base_uri</code></em> :</span></p></td>
<td>
<span class="type">raptor_uri</span> base URI of the input format</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-query-results-formatter-write"></a><h3>rasqal_query_results_formatter_write ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> rasqal_query_results_formatter_write
(<em class="parameter"><code><span class="type">raptor_iostream</span> *iostr</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> *formatter</code></em>,
<em class="parameter"><code><a class="link" href="rasqal-section-query-results.html#rasqal-query-results" title="rasqal_query_results"><span class="type">rasqal_query_results</span></a> *results</code></em>,
<em class="parameter"><code><span class="type">raptor_uri</span> *base_uri</code></em>);</pre>
<p>
Write the query results using the given formatter to an iostream
</p>
<p>
Note that after calling this method, the query results will be
empty and <a class="link" href="rasqal-section-query-results.html#rasqal-query-results-finished" title="rasqal_query_results_finished ()"><code class="function">rasqal_query_results_finished()</code></a> will return true (non-0)
</p>
<p>
See <a class="link" href="rasqal-section-general.html#rasqal-world-get-query-results-format-description" title="rasqal_world_get_query_results_format_description ()"><code class="function">rasqal_world_get_query_results_format_description()</code></a> for
obtaining the supported format URIs at run time.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>iostr</code></em> :</span></p></td>
<td>
<span class="type">raptor_iostream</span> to write the query to</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>formatter</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-query-results-formatter.html#rasqal-query-results-formatter" title="rasqal_query_results_formatter"><span class="type">rasqal_query_results_formatter</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>results</code></em> :</span></p></td>
<td>
<a class="link" href="rasqal-section-query-results.html#rasqal-query-results" title="rasqal_query_results"><span class="type">rasqal_query_results</span></a> query results format</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>base_uri</code></em> :</span></p></td>
<td>
<span class="type">raptor_uri</span> base URI of the output format (or NULL)</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>
</div>
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