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<h2><span class="refentrytitle"><a name="redland-stream.top_of_page"></a>Stream of triples (#librdf_statement).</span></h2>
<p>Stream of triples (#librdf_statement). — Sequence of RDF Triples.</p>
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<div class="refsynopsisdiv">
<a name="redland-stream.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">typedef <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream">librdf_stream</a>;
enum <a class="link" href="redland-stream.html#librdf-stream-get-method-flags" title="enum librdf_stream_get_method_flags">librdf_stream_get_method_flags</a>;
<a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="returnvalue">librdf_statement</span></a> * (<a class="link" href="redland-stream.html#librdf-stream-map-handler" title="librdf_stream_map_handler ()">*librdf_stream_map_handler</a>) (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><span class="type">void</span> *map_context</code></em>,
<em class="parameter"><code><a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a> *item</code></em>);
<span class="returnvalue">void</span> (<a class="link" href="redland-stream.html#librdf-stream-map-free-context-handler" title="librdf_stream_map_free_context_handler ()">*librdf_stream_map_free_context_handler</a>)
(<em class="parameter"><code><span class="type">void</span> *map_context</code></em>);
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="returnvalue">librdf_stream</span></a> * <a class="link" href="redland-stream.html#librdf-new-stream" title="librdf_new_stream ()">librdf_new_stream</a> (<em class="parameter"><code><a class="link" href="redland-world.html#librdf-world" title="librdf_world"><span class="type">librdf_world</span></a> *world</code></em>,
<em class="parameter"><code><span class="type">void</span> *context</code></em>,
<em class="parameter"><code><span class="type">int</span> (*is_end_method) (void*)</code></em>,
<em class="parameter"><code><span class="type">int</span> (*next_method) (void*)</code></em>,
<em class="parameter"><code><span class="type">void</span>* (*get_method) (void*, int)</code></em>,
<em class="parameter"><code><span class="type">void</span> (*finished_method) (void*)</code></em>);
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="returnvalue">librdf_stream</span></a> * <a class="link" href="redland-stream.html#librdf-new-stream-from-node-iterator" title="librdf_new_stream_from_node_iterator ()">librdf_new_stream_from_node_iterator</a>
(<em class="parameter"><code><a class="link" href="redland-iterator.html#librdf-iterator" title="librdf_iterator"><span class="type">librdf_iterator</span></a> *iterator</code></em>,
<em class="parameter"><code><a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a> *statement</code></em>,
<em class="parameter"><code><a class="link" href="redland-statement.html#librdf-statement-part" title="enum librdf_statement_part"><span class="type">librdf_statement_part</span></a> field</code></em>);
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="returnvalue">librdf_stream</span></a> * <a class="link" href="redland-stream.html#librdf-new-empty-stream" title="librdf_new_empty_stream ()">librdf_new_empty_stream</a> (<em class="parameter"><code><a class="link" href="redland-world.html#librdf-world" title="librdf_world"><span class="type">librdf_world</span></a> *world</code></em>);
<span class="returnvalue">void</span> <a class="link" href="redland-stream.html#librdf-free-stream" title="librdf_free_stream ()">librdf_free_stream</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-stream.html#librdf-stream-end" title="librdf_stream_end ()">librdf_stream_end</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-stream.html#librdf-stream-next" title="librdf_stream_next ()">librdf_stream_next</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);
<a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="returnvalue">librdf_statement</span></a> * <a class="link" href="redland-stream.html#librdf-stream-get-object" title="librdf_stream_get_object ()">librdf_stream_get_object</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);
<span class="returnvalue">void</span> * <a class="link" href="redland-stream.html#librdf-stream-get-context" title="librdf_stream_get_context ()">librdf_stream_get_context</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);
<a class="link" href="redland-node.html#librdf-node" title="librdf_node"><span class="returnvalue">librdf_node</span></a> * <a class="link" href="redland-stream.html#librdf-stream-get-context2" title="librdf_stream_get_context2 ()">librdf_stream_get_context2</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-stream.html#librdf-stream-add-map" title="librdf_stream_add_map ()">librdf_stream_add_map</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream-map-handler" title="librdf_stream_map_handler ()"><span class="type">librdf_stream_map_handler</span></a> map_function</code></em>,
<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream-map-free-context-handler" title="librdf_stream_map_free_context_handler ()"><span class="type">librdf_stream_map_free_context_handler</span></a> free_context</code></em>,
<em class="parameter"><code><span class="type">void</span> *map_context</code></em>);
<span class="returnvalue">void</span> <a class="link" href="redland-stream.html#librdf-stream-print" title="librdf_stream_print ()">librdf_stream_print</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-stream.html#librdf-stream-write" title="librdf_stream_write ()">librdf_stream_write</a> (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><span class="type">raptor_iostream</span> *iostr</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="redland-stream.description"></a><h2>Description</h2>
<p>
Iterate a sequence of RDF triples from some object.
</p>
</div>
<div class="refsect1">
<a name="redland-stream.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="librdf-stream"></a><h3>librdf_stream</h3>
<pre class="programlisting">typedef struct librdf_stream_s librdf_stream;
</pre>
<p>
Redland stream class.
</p>
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<div class="refsect2">
<a name="librdf-stream-get-method-flags"></a><h3>enum librdf_stream_get_method_flags</h3>
<pre class="programlisting">typedef enum {
LIBRDF_STREAM_GET_METHOD_GET_OBJECT = LIBRDF_ITERATOR_GET_METHOD_GET_OBJECT,
LIBRDF_STREAM_GET_METHOD_GET_CONTEXT = LIBRDF_ITERATOR_GET_METHOD_GET_CONTEXT
} librdf_stream_get_method_flags;
</pre>
<p>
Flags for <a class="link" href="redland-stream.html#librdf-new-stream" title="librdf_new_stream ()"><code class="function">librdf_new_stream()</code></a> get_method function pointer.
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<td><p><a name="LIBRDF-STREAM-GET-METHOD-GET-OBJECT:CAPS"></a><span class="term"><code class="literal">LIBRDF_STREAM_GET_METHOD_GET_OBJECT</code></span></p></td>
<td>get object from iterator - implementing <a class="link" href="redland-stream.html#librdf-stream-get-object" title="librdf_stream_get_object ()"><code class="function">librdf_stream_get_object()</code></a>
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<td><p><a name="LIBRDF-STREAM-GET-METHOD-GET-CONTEXT:CAPS"></a><span class="term"><code class="literal">LIBRDF_STREAM_GET_METHOD_GET_CONTEXT</code></span></p></td>
<td>get context from iterator - implementing <a class="link" href="redland-stream.html#librdf-stream-get-context" title="librdf_stream_get_context ()"><code class="function">librdf_stream_get_context()</code></a>
</td>
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<hr>
<div class="refsect2">
<a name="librdf-stream-map-handler"></a><h3>librdf_stream_map_handler ()</h3>
<pre class="programlisting"><a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="returnvalue">librdf_statement</span></a> * (*librdf_stream_map_handler) (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><span class="type">void</span> *map_context</code></em>,
<em class="parameter"><code><a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a> *item</code></em>);</pre>
<p>
Map function for a <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> map operation.
</p>
<p>
See <a class="link" href="redland-stream.html#librdf-stream-add-map" title="librdf_stream_add_map ()"><code class="function">librdf_stream_add_map()</code></a>.
</p>
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<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>Stream that this map is operating over.</td>
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<tr>
<td><p><span class="term"><em class="parameter"><code>map_context</code></em> :</span></p></td>
<td>Map data context pointer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>item</code></em> :</span></p></td>
<td>Pointer to the current item in the iteration.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>item in keep the iteration or NULL to remove it</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-map-free-context-handler"></a><h3>librdf_stream_map_free_context_handler ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*librdf_stream_map_free_context_handler)
(<em class="parameter"><code><span class="type">void</span> *map_context</code></em>);</pre>
<p>
Free handler function for a <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> map operation.
</p>
<p>
See <a class="link" href="redland-stream.html#librdf-stream-add-map" title="librdf_stream_add_map ()"><code class="function">librdf_stream_add_map()</code></a>.
</p>
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<td><p><span class="term"><em class="parameter"><code>map_context</code></em> :</span></p></td>
<td>Map data context pointer.</td>
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</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-stream"></a><h3>librdf_new_stream ()</h3>
<pre class="programlisting"><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="returnvalue">librdf_stream</span></a> * librdf_new_stream (<em class="parameter"><code><a class="link" href="redland-world.html#librdf-world" title="librdf_world"><span class="type">librdf_world</span></a> *world</code></em>,
<em class="parameter"><code><span class="type">void</span> *context</code></em>,
<em class="parameter"><code><span class="type">int</span> (*is_end_method) (void*)</code></em>,
<em class="parameter"><code><span class="type">int</span> (*next_method) (void*)</code></em>,
<em class="parameter"><code><span class="type">void</span>* (*get_method) (void*, int)</code></em>,
<em class="parameter"><code><span class="type">void</span> (*finished_method) (void*)</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a>.
</p>
<p>
Creates a new stream with an implementation based on the passed in
functions. The functions next_statement and end_of_stream will be called
multiple times until either of them signify the end of stream by
returning NULL or non 0 respectively. The finished function is called
once only when the stream object is destroyed with <a class="link" href="redland-stream.html#librdf-free-stream" title="librdf_free_stream ()"><code class="function">librdf_free_stream()</code></a>
</p>
<p>
A mapping function can be set for the stream using <a class="link" href="redland-stream.html#librdf-stream-add-map" title="librdf_stream_add_map ()"><code class="function">librdf_stream_add_map()</code></a>
function which allows the statements generated by the stream to be
filtered and/or altered as they are generated before passing back
to the user.
</p>
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<td><p><span class="term"><em class="parameter"><code>world</code></em> :</span></p></td>
<td>redland world object</td>
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<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>context to pass to the stream implementing objects</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>is_end_method</code></em> :</span></p></td>
<td>pointer to function to test for end of stream</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>next_method</code></em> :</span></p></td>
<td>pointer to function to move to the next statement in stream</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>get_method</code></em> :</span></p></td>
<td>pointer to function to get the current statement</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>finished_method</code></em> :</span></p></td>
<td>pointer to function to finish the stream.</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="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-stream-from-node-iterator"></a><h3>librdf_new_stream_from_node_iterator ()</h3>
<pre class="programlisting"><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="returnvalue">librdf_stream</span></a> * librdf_new_stream_from_node_iterator
(<em class="parameter"><code><a class="link" href="redland-iterator.html#librdf-iterator" title="librdf_iterator"><span class="type">librdf_iterator</span></a> *iterator</code></em>,
<em class="parameter"><code><a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a> *statement</code></em>,
<em class="parameter"><code><a class="link" href="redland-statement.html#librdf-statement-part" title="enum librdf_statement_part"><span class="type">librdf_statement_part</span></a> field</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> from an iterator of nodes.
</p>
<p>
Creates a new <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> using the passed in <a class="link" href="redland-iterator.html#librdf-iterator" title="librdf_iterator"><span class="type">librdf_iterator</span></a>
which generates a series of <a class="link" href="redland-node.html#librdf-node" title="librdf_node"><span class="type">librdf_node</span></a> objects. The resulting
nodes are then inserted into the given statement and returned.
The field attribute indicates which statement node is being generated.
</p>
<div class="variablelist"><table border="0">
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<td><p><span class="term"><em class="parameter"><code>iterator</code></em> :</span></p></td>
<td>
<a class="link" href="redland-iterator.html#librdf-iterator" title="librdf_iterator"><span class="type">librdf_iterator</span></a> of <a class="link" href="redland-node.html#librdf-node" title="librdf_node"><span class="type">librdf_node</span></a> objects</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>statement</code></em> :</span></p></td>
<td>
<a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a> prototype with one NULL node space</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>field</code></em> :</span></p></td>
<td>node part of statement</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="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-empty-stream"></a><h3>librdf_new_empty_stream ()</h3>
<pre class="programlisting"><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="returnvalue">librdf_stream</span></a> * librdf_new_empty_stream (<em class="parameter"><code><a class="link" href="redland-world.html#librdf-world" title="librdf_world"><span class="type">librdf_world</span></a> *world</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> with no content.
</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>redland world object</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="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-free-stream"></a><h3>librdf_free_stream ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> librdf_free_stream (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);</pre>
<p>
Destructor - destroy an <span class="type">libdf_stream</span> object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-end"></a><h3>librdf_stream_end ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_stream_end (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);</pre>
<p>
Test if the stream has ended.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non 0 at end of stream.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-next"></a><h3>librdf_stream_next ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_stream_next (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);</pre>
<p>
Move to the next librdf_statement in the stream.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>non 0 if the stream has finished</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-get-object"></a><h3>librdf_stream_get_object ()</h3>
<pre class="programlisting"><a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="returnvalue">librdf_statement</span></a> * librdf_stream_get_object (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);</pre>
<p>
Get the current librdf_statement in the stream.
</p>
<p>
This method returns a SHARED pointer to the current statement object
which should be copied by the caller to preserve it if the stream
is moved on <a class="link" href="redland-stream.html#librdf-stream-next" title="librdf_stream_next ()"><code class="function">librdf_stream_next()</code></a> or if it should last after the
stream is closed. <a class="link" href="redland-statement.html#librdf-new-statement-from-statement" title="librdf_new_statement_from_statement ()"><code class="function">librdf_new_statement_from_statement()</code></a> can be used
for copying the statement.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>
<a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current <a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a> object or NULL at end of stream.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-get-context"></a><h3>librdf_stream_get_context ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> * librdf_stream_get_context (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);</pre>
<p>
Get the context of the current object on the stream.
</p>
<p>
This method returns a SHARED pointer to the current context node object
which should be copied by the caller to preserve it if the stream
is moved on librdf_stream_next or if it should last after the
stream is closed.
</p>
<p>
<em class="parameter"><code>Deprecated</code></em>: Use <a class="link" href="redland-stream.html#librdf-stream-get-context2" title="librdf_stream_get_context2 ()"><code class="function">librdf_stream_get_context2()</code></a> which returns a <a class="link" href="redland-node.html#librdf-node" title="librdf_node"><span class="type">librdf_node</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>stream</code></em> :</span></p></td>
<td>the <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The context node (can be NULL) or NULL if the stream has finished.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-get-context2"></a><h3>librdf_stream_get_context2 ()</h3>
<pre class="programlisting"><a class="link" href="redland-node.html#librdf-node" title="librdf_node"><span class="returnvalue">librdf_node</span></a> * librdf_stream_get_context2 (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>);</pre>
<p>
Get the context of the current object on the stream.
</p>
<p>
This method returns a SHARED pointer to the current context node object
which should be copied by the caller to preserve it if the stream
is moved on librdf_stream_next or if it should last after the
stream is closed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>the <a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The context node (can be NULL) or NULL if the stream has finished.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-add-map"></a><h3>librdf_stream_add_map ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_stream_add_map (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream-map-handler" title="librdf_stream_map_handler ()"><span class="type">librdf_stream_map_handler</span></a> map_function</code></em>,
<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream-map-free-context-handler" title="librdf_stream_map_free_context_handler ()"><span class="type">librdf_stream_map_free_context_handler</span></a> free_context</code></em>,
<em class="parameter"><code><span class="type">void</span> *map_context</code></em>);</pre>
<p>
Add a librdf_stream mapping function.
</p>
<p>
Adds an stream mapping function which operates over the stream to
select which elements are returned; it will be applied as soon as
this method is called.
</p>
<p>
Several mapping functions can be added and they are applied in
the order given.
</p>
<p>
The mapping function should return the statement to return, or NULL
to remove it from the stream.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>the stream</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>map_function</code></em> :</span></p></td>
<td>the function to perform the mapping</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>free_context</code></em> :</span></p></td>
<td>the function to use to free the context (or NULL)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>map_context</code></em> :</span></p></td>
<td>the context to pass to the map function</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="librdf-stream-print"></a><h3>librdf_stream_print ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> librdf_stream_print (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Print the stream.
</p>
<p>
This prints the remaining statements of the stream to the given
file handle. Note that after this method is called the stream
will be empty so that <a class="link" href="redland-stream.html#librdf-stream-end" title="librdf_stream_end ()"><code class="function">librdf_stream_end()</code></a> will always be true
and <a class="link" href="redland-stream.html#librdf-stream-next" title="librdf_stream_next ()"><code class="function">librdf_stream_next()</code></a> will always return NULL. The only
useful operation is to dispose of the stream with the
<a class="link" href="redland-stream.html#librdf-free-stream" title="librdf_free_stream ()"><code class="function">librdf_free_stream()</code></a> destructor.
</p>
<p>
This method is for debugging and the format of the output should
not be relied on.
</p>
<p>
<em class="parameter"><code>Deprecated</code></em>: Use <a class="link" href="redland-stream.html#librdf-stream-write" title="librdf_stream_write ()"><code class="function">librdf_stream_write()</code></a> to write to
<span class="type">raptor_iostream</span> which can be made to write to a string. Use a
<a class="link" href="redland-serializer.html#librdf-serializer" title="librdf_serializer"><span class="type">librdf_serializer</span></a> to write proper syntax formats.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>the stream object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
<td>the FILE stream to print to</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-stream-write"></a><h3>librdf_stream_write ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_stream_write (<em class="parameter"><code><a class="link" href="redland-stream.html#librdf-stream" title="librdf_stream"><span class="type">librdf_stream</span></a> *stream</code></em>,
<em class="parameter"><code><span class="type">raptor_iostream</span> *iostr</code></em>);</pre>
<p>
Write a stream of triples to an iostream in a debug format.
</p>
<p>
This prints the remaining statements of the stream to the given
<span class="type">raptor_iostream</span> in a debug format.
</p>
<p>
Note that after this method is called the stream will be empty so
that <a class="link" href="redland-stream.html#librdf-stream-end" title="librdf_stream_end ()"><code class="function">librdf_stream_end()</code></a> will always be true and
<a class="link" href="redland-stream.html#librdf-stream-next" title="librdf_stream_next ()"><code class="function">librdf_stream_next()</code></a> will always return NULL. The only useful
operation is to dispose of the stream with the
<a class="link" href="redland-stream.html#librdf-free-stream" title="librdf_free_stream ()"><code class="function">librdf_free_stream()</code></a> destructor.
</p>
<p>
This method is for debugging and the format of the output should
not be relied on. In particular, when contexts are used the
result may be 4 nodes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>the stream object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iostr</code></em> :</span></p></td>
<td>the iostream to write to</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>
<div class="refsect1">
<a name="redland-stream.see-also"></a><h2>See Also</h2>
<p>
Provides a way to operate across a sequence of RDF Triples that are
generated one-by-one on demand. The generated triples can be from
some API call in the <a class="link" href="redland-model.html#librdf-model" title="librdf_model"><span class="type">librdf_model</span></a> class, from listing a graph content
as individual triples, from parsing a syntax or returning an RDF graph
result from a query. Streams can be passed into methods for the reverse
operations such as adding to a graph, serializing a graph to a syntax.
Streams pass individual triples (<a class="link" href="redland-statement.html#librdf-statement" title="librdf_statement"><span class="type">librdf_statement</span></a>) between objects
and are usually lazily generated and consumed.
</p>
</div>
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