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<a href="#dee-1.0-Model-Readers.description" class="shortcut">Description</a>
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<a name="dee-1.0-Model-Readers"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="dee-1.0-Model-Readers.top_of_page"></a>Model Readers</span></h2>
<p>Model Readers — Extracting strings from <span class="type">DeeModel</span>s</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="dee-1.0-Model-Readers.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <dee.h>
<a class="link" href="dee-1.0-Filters.html#DeeFilter" title="DeeFilter">DeeFilter</a>;
<a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader">DeeModelReader</a>;
<span class="returnvalue">gchar</span> * (<a class="link" href="dee-1.0-Model-Readers.html#DeeModelReaderFunc" title="DeeModelReaderFunc ()">*DeeModelReaderFunc</a>) (<em class="parameter"><code><span class="type">DeeModel</span> *model</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-DeeModel.html#DeeModelIter"><span class="type">DeeModelIter</span></a> *iter</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> userdata</code></em>);
<span class="returnvalue">void</span> <a class="link" href="dee-1.0-Model-Readers.html#dee-model-reader-destroy" title="dee_model_reader_destroy ()">dee_model_reader_destroy</a> (<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *reader</code></em>);
<span class="returnvalue">void</span> <a class="link" href="dee-1.0-Model-Readers.html#dee-model-reader-new" title="dee_model_reader_new ()">dee_model_reader_new</a> (<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReaderFunc" title="DeeModelReaderFunc ()"><span class="type">DeeModelReaderFunc</span></a> reader_func</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> userdata</code></em>,
<em class="parameter"><code><span class="type">GDestroyNotify</span> destroy</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);
<span class="returnvalue">void</span> <a class="link" href="dee-1.0-Model-Readers.html#dee-model-reader-new-for-int32-column" title="dee_model_reader_new_for_int32_column ()">dee_model_reader_new_for_int32_column</a>
(<em class="parameter"><code><span class="type">guint</span> column</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);
<span class="returnvalue">void</span> <a class="link" href="dee-1.0-Model-Readers.html#dee-model-reader-new-for-string-column" title="dee_model_reader_new_for_string_column ()">dee_model_reader_new_for_string_column</a>
(<em class="parameter"><code><span class="type">guint</span> column</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);
<span class="returnvalue">void</span> <a class="link" href="dee-1.0-Model-Readers.html#dee-model-reader-new-for-uint32-column" title="dee_model_reader_new_for_uint32_column ()">dee_model_reader_new_for_uint32_column</a>
(<em class="parameter"><code><span class="type">guint</span> column</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);
<span class="returnvalue">gchar</span> * <a class="link" href="dee-1.0-Model-Readers.html#dee-model-reader-read" title="dee_model_reader_read ()">dee_model_reader_read</a> (<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *self</code></em>,
<em class="parameter"><code><span class="type">DeeModel</span> *model</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-DeeModel.html#DeeModelIter"><span class="type">DeeModelIter</span></a> *iter</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="dee-1.0-Model-Readers.description"></a><h2>Description</h2>
<p>
The purpose of a <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> is to extract string from a <span class="type">DeeModel</span>.
These strings are usually passed through a <a class="link" href="DeeAnalyzer.html" title="DeeAnalyzer"><span class="type">DeeAnalyzer</span></a> on into a <a class="link" href="DeeIndex.html" title="DeeIndex"><span class="type">DeeIndex</span></a>.
</p>
<p>
Most readers will extract a value of a given type from a given column,
but it must be noted that this is not a requirement. The strings may be
built from several columns.
</p>
</div>
<div class="refsect1">
<a name="dee-1.0-Model-Readers.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="DeeFilter"></a><h3>DeeFilter</h3>
<pre class="programlisting">typedef struct {
DeeFilterMapFunc map_func;
DeeFilterMapNotify map_notify;
GDestroyNotify destroy;
gpointer userdata;
} DeeFilter;
</pre>
<p>
Structure encapsulating the mapping logic used to construct a <a class="link" href="DeeFilterModel.html" title="DeeFilterModel"><span class="type">DeeFilterModel</span></a>
</p>
</div>
<hr>
<div class="refsect2">
<a name="DeeModelReader"></a><h3>DeeModelReader</h3>
<pre class="programlisting">typedef struct {
DeeModelReaderFunc reader_func;
gpointer userdata;
GDestroyNotify destroy;
} DeeModelReader;
</pre>
<p>
Structure encapsulating the information needed to read strings from a
model. Used for example by <a class="link" href="DeeIndex.html" title="DeeIndex"><span class="type">DeeIndex</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="dee-1.0-Model-Readers.html#DeeModelReaderFunc" title="DeeModelReaderFunc ()"><span class="type">DeeModelReaderFunc</span></a> <em class="structfield"><code><a name="DeeModelReader.reader-func"></a>reader_func</code></em>;</span></p></td>
<td>The <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReaderFunc" title="DeeModelReaderFunc ()"><span class="type">DeeModelReaderFunc</span></a> used to extract
string from a model. <span class="annotation">[<acronym title="The callback is valid until the GDestroyNotify argument is called."><span class="acronym">scope notified</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">gpointer</span> <em class="structfield"><code><a name="DeeModelReader.userdata"></a>userdata</code></em>;</span></p></td>
<td>user data to pass to <em class="parameter"><code>reader_func</code></em>. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">GDestroyNotify</span> <em class="structfield"><code><a name="DeeModelReader.destroy"></a>destroy</code></em>;</span></p></td>
<td>Called when the reader is destroyed</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="DeeModelReaderFunc"></a><h3>DeeModelReaderFunc ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> * (*DeeModelReaderFunc) (<em class="parameter"><code><span class="type">DeeModel</span> *model</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-DeeModel.html#DeeModelIter"><span class="type">DeeModelIter</span></a> *iter</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> userdata</code></em>);</pre>
<p>
Extracts a string from a row in a model.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>model</code></em> :</span></p></td>
<td>The model being indexed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>The row to extract terms for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>userdata</code></em> :</span></p></td>
<td>The data set when registering the reader. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated string with the row data to be indexed.
Free with <code class="function">g_free()</code>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="dee-model-reader-destroy"></a><h3>dee_model_reader_destroy ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> dee_model_reader_destroy (<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *reader</code></em>);</pre>
<p>
Release resources associated with <em class="parameter"><code>reader</code></em>, but does not free the
<a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> structure itself.
</p>
<p>
This will call the <code class="function">destroy()</code> function registered with the reader
if it is set.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>reader</code></em> :</span></p></td>
<td>The reader to destroy</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="dee-model-reader-new"></a><h3>dee_model_reader_new ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> dee_model_reader_new (<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReaderFunc" title="DeeModelReaderFunc ()"><span class="type">DeeModelReaderFunc</span></a> reader_func</code></em>,
<em class="parameter"><code><span class="type">gpointer</span> userdata</code></em>,
<em class="parameter"><code><span class="type">GDestroyNotify</span> destroy</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);</pre>
<p>
Create a new <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> with the given parameters. This call will zero
the <em class="parameter"><code>out_reader</code></em> struct.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>reader_func</code></em> :</span></p></td>
<td>The <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReaderFunc" title="DeeModelReaderFunc ()"><span class="type">DeeModelReaderFunc</span></a> to use for the reader. <span class="annotation">[<acronym title="The callback is valid until the GDestroyNotify argument is called."><span class="acronym">scope notified</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>userdata</code></em> :</span></p></td>
<td>The user data to pass to <em class="parameter"><code>reader_func</code></em>. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy</code></em> :</span></p></td>
<td>The <span class="type">GDestroyNotify</span> to call on
<em class="parameter"><code>userdata</code></em> when disposing of the reader. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_reader</code></em> :</span></p></td>
<td>A pointer to an uninitialized <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> struct. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="dee-model-reader-new-for-int32-column"></a><h3>dee_model_reader_new_for_int32_column ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> dee_model_reader_new_for_int32_column
(<em class="parameter"><code><span class="type">guint</span> column</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);</pre>
<p>
A <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> reading a <code class="literal">gint32</code> from a <span class="type">DeeModel</span> at a given column
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>column</code></em> :</span></p></td>
<td>The column index to read a <code class="literal">gint32</code> from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_reader</code></em> :</span></p></td>
<td>A pointer to a <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> instance which will have
all fields initialized appropriately. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="dee-model-reader-new-for-string-column"></a><h3>dee_model_reader_new_for_string_column ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> dee_model_reader_new_for_string_column
(<em class="parameter"><code><span class="type">guint</span> column</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);</pre>
<p>
A <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> reading a string from a <span class="type">DeeModel</span> at a given column
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>column</code></em> :</span></p></td>
<td>The column index to read a string from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_reader</code></em> :</span></p></td>
<td>A pointer to a <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> instance which will have
all fields initialized appropriately. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="dee-model-reader-new-for-uint32-column"></a><h3>dee_model_reader_new_for_uint32_column ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> dee_model_reader_new_for_uint32_column
(<em class="parameter"><code><span class="type">guint</span> column</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *out_reader</code></em>);</pre>
<p>
A <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> reading a <code class="literal">guint32</code> from a <span class="type">DeeModel</span> at a given column
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>column</code></em> :</span></p></td>
<td>The column index to read a <code class="literal">guint32</code> from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_reader</code></em> :</span></p></td>
<td>A pointer to a <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> instance which will have
all fields initialized appropriately. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="dee-model-reader-read"></a><h3>dee_model_reader_read ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> * dee_model_reader_read (<em class="parameter"><code><a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> *self</code></em>,
<em class="parameter"><code><span class="type">DeeModel</span> *model</code></em>,
<em class="parameter"><code><a class="link" href="dee-1.0-DeeModel.html#DeeModelIter"><span class="type">DeeModelIter</span></a> *iter</code></em>);</pre>
<p>
Read data from a row in a <span class="type">DeeModel</span> and extract a string representation from
it.
</p>
<p>
Note that generally a <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> need not be confined to reading from
one specific column, although in practice most are.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>self</code></em> :</span></p></td>
<td>The <a class="link" href="dee-1.0-Model-Readers.html#DeeModelReader" title="DeeModelReader"><span class="type">DeeModelReader</span></a> used to read <em class="parameter"><code>model</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>model</code></em> :</span></p></td>
<td>The <span class="type">DeeModel</span> to read a string from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>iter</code></em> :</span></p></td>
<td>The row to read a string from</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated string. Free with <code class="function">g_free()</code>.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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