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KDE 4.4 PyKDE API Reference
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<h1>DataEngineManager Class Reference</h1>
<code>from PyKDE4.plasma import *</code>
<p>
Inherits: <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qobject.html">QObject</a><br />
Namespace: Plasma.DataEngineManager<br />
<h2>Detailed Description</h2>
<p>DataEngineManager plasma/dataenginemanager.h <Plasma/DataEngineManager>
</p>
<p>
DataEngine loader and life time manager
</p>
<p>
Plasma.DataEngineManager provides facilities for listing, loading and
according to reference count unloading of DataEngines.
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#DataEngineManager">__init__</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../plasma/Plasma.DataEngine.html">Plasma.DataEngine</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#engine">engine</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstringlist.html">QStringList</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#listAllEngines">listAllEngines</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> parentApp=QString())</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KPluginInfo.List.html">KPluginInfo.List</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#listEngineInfo">listEngineInfo</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> parentApp=QString())</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KPluginInfo.List.html">KPluginInfo.List</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#listEngineInfoByCategory">listEngineInfoByCategory</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> category, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> parentApp=QString())</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../plasma/Plasma.DataEngine.html">Plasma.DataEngine</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#loadEngine">loadEngine</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../plasma/Plasma.DataEngineManager.html">Plasma.DataEngineManager</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#self">self</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#unloadEngine">unloadEngine</a> (self, <a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> name)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="DataEngineManager"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Default constructor. The singleton method self() is the
preferred access mechanism.
</p></div></div><a class="anchor" name="engine"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../plasma/Plasma.DataEngine.html">Plasma.DataEngine</a> engine</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>name</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Returns a data engine object if one is loaded and available.
On failure, the fallback NullEngine (which does nothing and
!isValid()) is returned.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>name</em> </td><td> the name of the engine
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="listAllEngines"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstringlist.html">QStringList</a> listAllEngines</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>parentApp=QString()</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p><dl class="return" compact><dt><b>Returns:</b></dt><dd> a listing of all known DataEngines by name
</dd></dl> </p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>parentApp</em> </td><td> the application to filter applets on. Uses the
X-KDE-ParentApp entry (if any) in the plugin info.
The default value of QString() will result in a
list containing only applets not specifically
registered to an application.
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="listEngineInfo"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KPluginInfo.List.html">KPluginInfo.List</a> listEngineInfo</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>parentApp=QString()</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Returns a list of all known DataEngines.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>parentApp</em> </td><td> the application to filter applets on. Uses the
X-KDE-ParentApp entry (if any) in the plugin info.
The default value of QString() will result in a
list containing only applets not specifically
registered to an application.
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> list of DataEngines
</dd></dl>
</p></div></div><a class="anchor" name="listEngineInfoByCategory"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KPluginInfo.List.html">KPluginInfo.List</a> listEngineInfoByCategory</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>category</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>parentApp=QString()</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Returns a list of all known DataEngines filtering by category.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>category</em> </td><td> the category to filter applets on. Uses the
X-KDE-PluginInfo-Category entry (if any) in the
plugin info. The value of QString() will
result in a list of engines with an empty category.
</td></tr>
<tr><td></td><td valign="top"><em>parentApp</em> </td><td> the application to filter applets on. Uses the
X-KDE-ParentApp entry (if any) in the plugin info.
The default value of QString() will result in a
list containing only applets not specifically
registered to an application.
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> list of DataEngines
</dd></dl> <dl class="since" compact><dt><b>Since:</b></dt><dd> 4.3
</dd></dl>
</p></div></div><a class="anchor" name="loadEngine"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../plasma/Plasma.DataEngine.html">Plasma.DataEngine</a> loadEngine</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>name</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Loads a data engine and increases the reference count on it.
This should be called once per object (or set of objects) using the
DataEngine. Afterwards, dataEngine should be used or the return
value cached. Call unloadDataEngine when finished with the engine.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>name</em> </td><td> the name of the engine
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> the data engine that was loaded, or the NullEngine on failure.
</dd></dl>
</p></div></div><a class="anchor" name="self"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../plasma/Plasma.DataEngineManager.html">Plasma.DataEngineManager</a> self</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Singleton pattern accessor.
</p></div></div><a class="anchor" name="unloadEngine"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> unloadEngine</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qstring.html">QString</a> </td>
<td class="paramname"><em>name</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Decreases the reference count on the engine. If the count reaches
zero, then the engine is deleted to save resources.
</p></div></div>
</div>
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