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<div class="refentry">
<a name="redland-hash"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="redland-hash.top_of_page"></a>Hashes</span></h2>
<p>Hashes — Key:Value hashes or dictionaries.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="redland-hash.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">typedef <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a>;
typedef <a class="link" href="redland-hash.html#librdf-hash-cursor" title="librdf_hash_cursor">librdf_hash_cursor</a>;
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * <a class="link" href="redland-hash.html#librdf-new-hash" title="librdf_new_hash ()">librdf_new_hash</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>const <span class="type">char</span> *name</code></em>);
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * <a class="link" href="redland-hash.html#librdf-new-hash-from-string" title="librdf_new_hash_from_string ()">librdf_new_hash_from_string</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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *string</code></em>);
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * <a class="link" href="redland-hash.html#librdf-new-hash-from-array-of-strings" title="librdf_new_hash_from_array_of_strings ()">librdf_new_hash_from_array_of_strings</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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> **array</code></em>);
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * <a class="link" href="redland-hash.html#librdf-new-hash-from-hash" title="librdf_new_hash_from_hash ()">librdf_new_hash_from_hash</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *old_hash</code></em>);
<span class="returnvalue">void</span> <a class="link" href="redland-hash.html#librdf-free-hash" title="librdf_free_hash ()">librdf_free_hash</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>);
<span class="returnvalue">char</span> * <a class="link" href="redland-hash.html#librdf-hash-get" title="librdf_hash_get ()">librdf_hash_get</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-hash.html#librdf-hash-get-as-boolean" title="librdf_hash_get_as_boolean ()">librdf_hash_get_as_boolean</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);
<span class="returnvalue">long</span> <a class="link" href="redland-hash.html#librdf-hash-get-as-long" title="librdf_hash_get_as_long ()">librdf_hash_get_as_long</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);
<span class="returnvalue">char</span> * <a class="link" href="redland-hash.html#librdf-hash-get-del" title="librdf_hash_get_del ()">librdf_hash_get_del</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-hash.html#librdf-hash-put-strings" title="librdf_hash_put_strings ()">librdf_hash_put_strings</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);
<span class="returnvalue">void</span> <a class="link" href="redland-hash.html#librdf-hash-print" title="librdf_hash_print ()">librdf_hash_print</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
<span class="returnvalue">void</span> <a class="link" href="redland-hash.html#librdf-hash-print-keys" title="librdf_hash_print_keys ()">librdf_hash_print_keys</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
<span class="returnvalue">void</span> <a class="link" href="redland-hash.html#librdf-hash-print-values" title="librdf_hash_print_values ()">librdf_hash_print_values</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key_string</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);
unsigned <span class="returnvalue">char</span> * <a class="link" href="redland-hash.html#librdf-hash-interpret-template" title="librdf_hash_interpret_template ()">librdf_hash_interpret_template</a> (<em class="parameter"><code>const unsigned <span class="type">char</span> *template_string</code></em>,
<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *dictionary</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *prefix</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *suffix</code></em>);
<span class="returnvalue">int</span> <a class="link" href="redland-hash.html#librdf-hash-from-string" title="librdf_hash_from_string ()">librdf_hash_from_string</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *string</code></em>);
<span class="returnvalue">char</span> * <a class="link" href="redland-hash.html#librdf-hash-to-string" title="librdf_hash_to_string ()">librdf_hash_to_string</a> (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *filter[]</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="redland-hash.description"></a><h2>Description</h2>
<p>
Interface to implementations of key:value hashes either in memory, on
disk and with persistence. Keys may have multiple and duplicate values.
</p>
</div>
<div class="refsect1">
<a name="redland-hash.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="librdf-hash"></a><h3>librdf_hash</h3>
<pre class="programlisting">typedef struct librdf_hash_s librdf_hash;
</pre>
<p>
Redland hash class.
</p>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-cursor"></a><h3>librdf_hash_cursor</h3>
<pre class="programlisting">typedef struct librdf_hash_cursor_s librdf_hash_cursor;
</pre>
<p>
Redland hash cursor class.
</p>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-hash"></a><h3>librdf_new_hash ()</h3>
<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * librdf_new_hash (<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>const <span class="type">char</span> *name</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</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>world</code></em> :</span></p></td>
<td>redland world object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>factory name</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-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-hash-from-string"></a><h3>librdf_new_hash_from_string ()</h3>
<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * librdf_new_hash_from_string (<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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *string</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object from a string.
</p>
<p>
See <a class="link" href="redland-hash.html#librdf-hash-from-string" title="librdf_hash_from_string ()"><span class="type">librdf_hash_from_string</span></a> for the string 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>redland world object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>hash name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
<td>hash encoded as a string</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-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-hash-from-array-of-strings"></a><h3>librdf_new_hash_from_array_of_strings ()</h3>
<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * librdf_new_hash_from_array_of_strings
(<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>const <span class="type">char</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">char</span> **array</code></em>);</pre>
<p>
Constructor - create a new <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object from an array of strings.
</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"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>hash name</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>array</code></em> :</span></p></td>
<td>address of the start of the array of char* pointers</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-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-new-hash-from-hash"></a><h3>librdf_new_hash_from_hash ()</h3>
<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="returnvalue">librdf_hash</span></a> * librdf_new_hash_from_hash (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *old_hash</code></em>);</pre>
<p>
Copy Constructor - create a new <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object from an existing one.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>old_hash</code></em> :</span></p></td>
<td>the hash to use to construct the hash</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-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-free-hash"></a><h3>librdf_free_hash ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> librdf_free_hash (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>);</pre>
<p>
Destructor - destroy a <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</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>hash</code></em> :</span></p></td>
<td>hash object</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-get"></a><h3>librdf_hash_get ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> * librdf_hash_get (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);</pre>
<p>
Retrieve one value from hash for a given key as string.
</p>
<p>
The value returned is from newly allocated memory which the
caller must free.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>hash object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>pointer to key</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the value or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-get-as-boolean"></a><h3>librdf_hash_get_as_boolean ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_hash_get_as_boolean (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);</pre>
<p>
Lookup a hash key and decode value as a boolean.
</p>
<p>
False values: "no", "false"
True values: "yes", "true"
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>key string to look up</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>>0 (for true), 0 (for false) or <0 (for key not found or not known boolean value)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-get-as-long"></a><h3>librdf_hash_get_as_long ()</h3>
<pre class="programlisting"><span class="returnvalue">long</span> librdf_hash_get_as_long (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);</pre>
<p>
Lookup a hash key and decode value as a long.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>key string to look up</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>>0 (for success), <0 (for key not found or not known boolean value)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-get-del"></a><h3>librdf_hash_get_del ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> * librdf_hash_get_del (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>);</pre>
<p>
Retrieve one value from hash for a given key as string and remove all values with that key.
</p>
<p>
The value returned is from newly allocated memory which the
caller must free.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>hash object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>pointer to key</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the value or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-put-strings"></a><h3>librdf_hash_put_strings ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_hash_put_strings (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *value</code></em>);</pre>
<p>
Insert key/value pairs into the hash as strings.
</p>
<p>
The key and values are copied into the hash, no sharing i s done.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>hash object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
<td>key</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>value</code></em> :</span></p></td>
<td>value</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-hash-print"></a><h3>librdf_hash_print ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> librdf_hash_print (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Pretty print the hash to a file descriptor.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>the hash</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
<td>file handle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-print-keys"></a><h3>librdf_hash_print_keys ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> librdf_hash_print_keys (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Pretty print the keys to a file descriptor.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>the hash</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
<td>file handle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-print-values"></a><h3>librdf_hash_print_values ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> librdf_hash_print_values (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *key_string</code></em>,
<em class="parameter"><code><span class="type">FILE</span> *fh</code></em>);</pre>
<p>
Pretty print the values of one key to a file descriptor.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>the hash</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>key_string</code></em> :</span></p></td>
<td>the key as a string</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fh</code></em> :</span></p></td>
<td>file handle</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-interpret-template"></a><h3>librdf_hash_interpret_template ()</h3>
<pre class="programlisting">unsigned <span class="returnvalue">char</span> * librdf_hash_interpret_template (<em class="parameter"><code>const unsigned <span class="type">char</span> *template_string</code></em>,
<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *dictionary</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *prefix</code></em>,
<em class="parameter"><code>const unsigned <span class="type">char</span> *suffix</code></em>);</pre>
<p>
Interpret keys in a template string to their value in a dictionary.
</p>
<p>
Can be used to do variable substitution for a string where
the syntax that marks the variable is defined by the <em class="parameter"><code>prefix</code></em>
and <em class="parameter"><code>suffix</code></em> strings, and the variables are stored in the <em class="parameter"><code>dictionary</code></em>
hash table.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>template_string</code></em> :</span></p></td>
<td>template string to interprate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dictionary</code></em> :</span></p></td>
<td>dictionary of key/values to substitute</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>prefix</code></em> :</span></p></td>
<td>prefix to mark a key in the template</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>suffix</code></em> :</span></p></td>
<td>suffix to mark a key in the template</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Newly allocated string, or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="librdf-hash-from-string"></a><h3>librdf_hash_from_string ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> librdf_hash_from_string (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *string</code></em>);</pre>
<p>
Initialise a hash from a string.
</p>
<p>
The string format is something like:
key1='value1',key2='value2', key3='\'quoted value\''
</p>
<p>
The 's are required and whitespace can appear around the = and ,s
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>hash object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
<td>hash encoded as a string</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-hash-to-string"></a><h3>librdf_hash_to_string ()</h3>
<pre class="programlisting"><span class="returnvalue">char</span> * librdf_hash_to_string (<em class="parameter"><code><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> *hash</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *filter[]</code></em>);</pre>
<p>
Format the hash as a string, suitable for parsing by librdf_hash_from_string.
</p>
<p>
Note: this method allocates a new string since this is a _to_ method
and the caller must call <a class="link" href="redland-general.html#librdf-free-memory" title="librdf_free_memory ()"><code class="function">librdf_free_memory()</code></a> to free the resulting memory.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
<td>
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filter</code></em> :</span></p></td>
<td>NULL terminated list of keys to ignore</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>string representation of the hash or NULL on failure</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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