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544 lines
23 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Hashes</title>
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<link rel="start" href="index.html" title="Redland RDF Library Manual">
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<link rel="part" href="reference-manual.html" title="Part II. Reference Manual">
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<link rel="chapter" href="objects.html" title="Objects in C">
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<link rel="index" href="indexes.html" title="Index">
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<tr><td colspan="5" class="shortcuts"><nobr><a href="#redland-hash.synopsis" class="shortcut">Top</a>
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<a href="#redland-hash.description" class="shortcut">Description</a></nobr></td></tr>
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</table>
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<div class="refentry" lang="en">
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<a name="redland-hash"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<td valign="top">
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<h2><span class="refentrytitle"><a name="redland-hash.top_of_page"></a>Hashes</span></h2>
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<p>Hashes — Key:Value hashes or dictionaries.</p>
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</td>
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<td valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsynopsisdiv">
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<a name="redland-hash.synopsis"></a><h2>Synopsis</h2>
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<pre class="synopsis">
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typedef <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a>;
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typedef <a class="link" href="redland-hash.html#librdf-hash-cursor" title="librdf_hash_cursor">librdf_hash_cursor</a>;
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<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</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> (<a class="link" href="redland-world.html#librdf-world" title="librdf_world">librdf_world</a> *world,
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const char *name,
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const char *string);
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<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</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>
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(<a class="link" href="redland-world.html#librdf-world" title="librdf_world">librdf_world</a> *world,
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const char *name,
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const char **array);
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<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</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> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *old_hash);
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void <a class="link" href="redland-hash.html#librdf-free-hash" title="librdf_free_hash ()">librdf_free_hash</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash);
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char* <a class="link" href="redland-hash.html#librdf-hash-get" title="librdf_hash_get ()">librdf_hash_get</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);
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int <a class="link" href="redland-hash.html#librdf-hash-get-as-boolean" title="librdf_hash_get_as_boolean ()">librdf_hash_get_as_boolean</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);
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long <a class="link" href="redland-hash.html#librdf-hash-get-as-long" title="librdf_hash_get_as_long ()">librdf_hash_get_as_long</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);
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char* <a class="link" href="redland-hash.html#librdf-hash-get-del" title="librdf_hash_get_del ()">librdf_hash_get_del</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);
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int <a class="link" href="redland-hash.html#librdf-hash-put-strings" title="librdf_hash_put_strings ()">librdf_hash_put_strings</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key,
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const char *value);
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void <a class="link" href="redland-hash.html#librdf-hash-print" title="librdf_hash_print ()">librdf_hash_print</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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FILE *fh);
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void <a class="link" href="redland-hash.html#librdf-hash-print-keys" title="librdf_hash_print_keys ()">librdf_hash_print_keys</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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FILE *fh);
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void <a class="link" href="redland-hash.html#librdf-hash-print-values" title="librdf_hash_print_values ()">librdf_hash_print_values</a> (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key_string,
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FILE *fh);
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unsigned char* <a class="link" href="redland-hash.html#librdf-hash-interpret-template" title="librdf_hash_interpret_template ()">librdf_hash_interpret_template</a> (unsigned char *template_string,
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<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *dictionary,
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unsigned char *prefix,
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unsigned char *suffix);
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</pre>
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</div>
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<div class="refsect1" lang="en">
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<a name="redland-hash.description"></a><h2>Description</h2>
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<p>
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Interface to implementations of key:value hashes either in memory, on
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disk and with persistence. Keys may have multiple and duplicate values.
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</p>
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</div>
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<div class="refsect1" lang="en">
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<a name="redland-hash.details"></a><h2>Details</h2>
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<div class="refsect2" lang="en">
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<a name="librdf-hash"></a><h3>librdf_hash</h3>
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<pre class="programlisting">typedef struct librdf_hash_s librdf_hash;
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</pre>
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<p>
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Redland hash class.</p>
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<p>
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</p>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-hash-cursor"></a><h3>librdf_hash_cursor</h3>
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<pre class="programlisting">typedef struct librdf_hash_cursor_s librdf_hash_cursor;
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</pre>
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<p>
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Redland hash cursor class.</p>
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<p>
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</p>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-new-hash-from-string"></a><h3>librdf_new_hash_from_string ()</h3>
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<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a>* librdf_new_hash_from_string (<a class="link" href="redland-world.html#librdf-world" title="librdf_world">librdf_world</a> *world,
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const char *name,
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const char *string);</pre>
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<p>
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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.
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</p>
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<p>
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See <span class="type">librdf_hash_from_string</span> for the string format.</p>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>world</code></em> :</span></p></td>
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<td> redland world object
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
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<td> hash name
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>string</code></em> :</span></p></td>
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<td> hash encoded as a string
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<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
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-new-hash-from-array-of-strings"></a><h3>librdf_new_hash_from_array_of_strings ()</h3>
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<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a>* librdf_new_hash_from_array_of_strings
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(<a class="link" href="redland-world.html#librdf-world" title="librdf_world">librdf_world</a> *world,
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const char *name,
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const char **array);</pre>
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<p>
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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>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>world</code></em> :</span></p></td>
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<td> redland world object
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
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<td> hash name
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>array</code></em> :</span></p></td>
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<td> address of the start of the array of char* pointers
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<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
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-new-hash-from-hash"></a><h3>librdf_new_hash_from_hash ()</h3>
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<pre class="programlisting"><a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a>* librdf_new_hash_from_hash (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *old_hash);</pre>
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<p>
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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>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>old_hash</code></em> :</span></p></td>
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<td> the hash to use to construct the hash
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<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
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-free-hash"></a><h3>librdf_free_hash ()</h3>
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<pre class="programlisting">void librdf_free_hash (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash);</pre>
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<p>
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Destructor - destroy a <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object.</p>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody><tr>
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<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
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<td> hash object
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</td>
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</tr></tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-hash-get"></a><h3>librdf_hash_get ()</h3>
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<pre class="programlisting">char* librdf_hash_get (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);</pre>
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<p>
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Retrieve one value from hash for a given key as string.
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</p>
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<p>
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The value returned is from newly allocated memory which the
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caller must free.</p>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
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<td> hash object
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
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<td> pointer to key
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td> the value or NULL on failure
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-hash-get-as-boolean"></a><h3>librdf_hash_get_as_boolean ()</h3>
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<pre class="programlisting">int librdf_hash_get_as_boolean (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);</pre>
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<p>
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Lookup a hash key and decode value as a boolean.</p>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
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<td> <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
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<td> key string to look up
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td> >0 (for true), 0 (for false) or <0 (for key not found or not known boolean value)
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-hash-get-as-long"></a><h3>librdf_hash_get_as_long ()</h3>
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<pre class="programlisting">long librdf_hash_get_as_long (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);</pre>
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<p>
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Lookup a hash key and decode value as a long.</p>
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<p>
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</p>
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<div class="variablelist"><table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>hash</code></em> :</span></p></td>
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<td> <a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash"><span class="type">librdf_hash</span></a> object
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><em class="parameter"><code>key</code></em> :</span></p></td>
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<td> key string to look up
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</td>
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</tr>
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<tr>
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<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
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<td> >0 (for success), <0 (for key not found or not known boolean value)
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<hr>
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<div class="refsect2" lang="en">
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<a name="librdf-hash-get-del"></a><h3>librdf_hash_get_del ()</h3>
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<pre class="programlisting">char* librdf_hash_get_del (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
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const char *key);</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>
|
||
<p>
|
||
|
||
</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" lang="en">
|
||
<a name="librdf-hash-put-strings"></a><h3>librdf_hash_put_strings ()</h3>
|
||
<pre class="programlisting">int librdf_hash_put_strings (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
|
||
const char *key,
|
||
const char *value);</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>
|
||
<p>
|
||
|
||
</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" lang="en">
|
||
<a name="librdf-hash-print"></a><h3>librdf_hash_print ()</h3>
|
||
<pre class="programlisting">void librdf_hash_print (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
|
||
FILE *fh);</pre>
|
||
<p>
|
||
Pretty print the hash to a file descriptor.</p>
|
||
<p>
|
||
|
||
</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" lang="en">
|
||
<a name="librdf-hash-print-keys"></a><h3>librdf_hash_print_keys ()</h3>
|
||
<pre class="programlisting">void librdf_hash_print_keys (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
|
||
FILE *fh);</pre>
|
||
<p>
|
||
Pretty print the keys to a file descriptor.</p>
|
||
<p>
|
||
|
||
</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" lang="en">
|
||
<a name="librdf-hash-print-values"></a><h3>librdf_hash_print_values ()</h3>
|
||
<pre class="programlisting">void librdf_hash_print_values (<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *hash,
|
||
const char *key_string,
|
||
FILE *fh);</pre>
|
||
<p>
|
||
Pretty print the values of one key to a file descriptor.</p>
|
||
<p>
|
||
|
||
</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" lang="en">
|
||
<a name="librdf-hash-interpret-template"></a><h3>librdf_hash_interpret_template ()</h3>
|
||
<pre class="programlisting">unsigned char* librdf_hash_interpret_template (unsigned char *template_string,
|
||
<a class="link" href="redland-hash.html#librdf-hash" title="librdf_hash">librdf_hash</a> *dictionary,
|
||
unsigned char *prefix,
|
||
unsigned char *suffix);</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>
|
||
<p>
|
||
|
||
</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>
|
||
</div>
|
||
</div>
|
||
<div class="footer">
|
||
<hr>
|
||
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|
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|
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