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KDE 4.7 PyKDE API Reference
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<h1>ItemSerializerPlugin Class Reference</h1>
<code>from PyKDE4.akonadi import *</code>
<p>
Namespace: <a href="../akonadi/Akonadi.html">Akonadi</a><br />
<h2>Detailed Description</h2>
<dl class="abstract" compact><dt><b>Abstract class:</b></dt>
<dd>This class can be used as a base class for new classes, but can not be instantiated directly.</dd></dl>
<p>The base class for item type serializer plugins.
</p>
<p>
Serializer plugins convert between the payload of Akonadi.Item objects and
a textual or binary representation of the actual content data.
This allows to easily add support for new types to Akonadi.
</p>
<p>
The following example shows how to implement a serializer plugin for
a new data type PimNote.
</p>
<p>
The PimNote data structure:
<pre class="fragment">
typedef struct {
QString author;
QDateTime dateTime;
QString text;
} PimNote;
</pre>
</p>
<p>
The serializer plugin code:
<pre class="fragment">
#include <QtCore/qplugin.h>
class SerializerPluginPimNote : public QObject, public Akonadi.ItemSerializerPlugin
{
Q_OBJECT
Q_INTERFACES( Akonadi.ItemSerializerPlugin )
public:
bool deserialize( Akonadi.Item& item, const QByteArray& label, QIODevice& data, int version )
{
// we don't handle versions in this example
Q_UNUSED( version );
// we work only on full payload
if ( label != Akonadi.Item.FullPayload )
return false;
QDataStream stream( &data );
PimNote note;
stream >> note.author;
stream >> note.dateTime;
stream >> note.text;
item.setPayload<PimNote>( note );
return true;
}
void serialize( const Akonadi.Item& item, const QByteArray& label, QIODevice& data, int &version )
{
// we don't handle versions in this example
Q_UNUSED( version );
if ( label != Akonadi.Item.FullPayload || !item.hasPayload<PimNote>() )
return;
QDataStream stream( &data );
PimNote note = item.payload<PimNote>();
stream << note.author;
stream << note.dateTime;
stream << note.text;
}
};
Q_EXPORT_PLUGIN2( akonadi_serializer_pimnote, SerializerPluginPimNote )
</pre>
</p>
<p>
The desktop file:
<pre class="fragment">
[Misc]
Name=Pim Note Serializer
Comment=An Akonadi serializer plugin for note objects
[Plugin]
Type=application/x-pimnote
X-KDE-Library=akonadi_serializer_pimnote
</pre>
</p>
<p>
<dl class="author" compact><dt><b>Author:</b></dt><dd> Till Adam <adam@kde.org>, Volker Krause <vkrause@kde.org> </dd></dl>
</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">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#deserialize">deserialize</a> (self, <a href="../akonadi/Akonadi.Item.html">Akonadi.Item</a> item, QByteArray label, QIODevice data, int version)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QSet<QByteArray> </td><td class="memItemRight" valign="bottom"><a class="el" href="#parts">parts</a> (self, <a href="../akonadi/Akonadi.Item.html">Akonadi.Item</a> item)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#serialize">serialize</a> (self, <a href="../akonadi/Akonadi.Item.html">Akonadi.Item</a> item, QByteArray label, QIODevice data, int version)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="deserialize"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool deserialize</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="../akonadi/Akonadi.Item.html">Akonadi.Item</a> </td>
<td class="paramname"><em>item</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QByteArray </td>
<td class="paramname"><em>label</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QIODevice </td>
<td class="paramname"><em>data</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>version</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><dl compact><dt><b>Abstract method:</b></dt><dd>This method is abstract and can be overridden but not called directly.</dd></dl><p>Converts serialized item data provided in <b>data</b> into payload for <b>item.</b>
</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>item</em> </td><td> The item to which the payload should be added.
It is guaranteed to have a mime type matching one of the supported
mime types of this plugin.
However it might contain a unsuited payload added manually
by the application developer.
Verifying the payload type in case a payload is already available
is recommended therefore.
<tr><td></td><td valign="top"><em>label</em> </td><td> The part identifier of the part to deserialize.
<b>label</b> might be an unsupported item part, return false if this is the case.
<tr><td></td><td valign="top"><em>data</em> </td><td> A QIODevice providing access to the serialized data.
The QIODevice is opened in read-only mode and positioned at the beginning.
The QIODevice is guaranteed to be valid.
<tr><td></td><td valign="top"><em>version</em> </td><td> The version of the data format as set by the user in serialize() or 0 (default).
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> false if the specified part is not supported by this plugin, true if the part
could be de-serialized successfully.
</dd></dl>
</p></div></div><a class="anchor" name="parts"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">QSet<QByteArray> parts</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="../akonadi/Akonadi.Item.html">Akonadi.Item</a> </td>
<td class="paramname"><em>item</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 available parts for the given item payload.
The default implementation returns Item.FullPayload if a payload is set.
</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>item</em> </td><td> The item.
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="serialize"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> serialize</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="../akonadi/Akonadi.Item.html">Akonadi.Item</a> </td>
<td class="paramname"><em>item</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QByteArray </td>
<td class="paramname"><em>label</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QIODevice </td>
<td class="paramname"><em>data</em>, </td>
</tr>
<tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>version</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><dl compact><dt><b>Abstract method:</b></dt><dd>This method is abstract and can be overridden but not called directly.</dd></dl><p>Convert the payload object provided in <b>item</b> into its serialzed form into <b>data.</b>
</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>item</em> </td><td> The item which contains the payload.
It is guaranteed to have a mimetype matching one of the supported
mimetypes of this plugin as well as the existence of a payload object.
However it might contain an unsupported payload added manually by
the application developer.
Verifying the payload type is recommended therefore.
<tr><td></td><td valign="top"><em>label</em> </td><td> The part identifier of the part to serialize.
<b>label</b> will be one of the item parts returned by parts().
<tr><td></td><td valign="top"><em>data</em> </td><td> The QIODevice where the serialized data should be written to.
The QIODevice is opened in write-only mode and positioned at the beginning.
The QIODevice is guaranteed to be valid.
<tr><td></td><td valign="top"><em>version</em> </td><td> The version of the data format. Can be set by the user to handle different
versions.
</td></tr>
</table></dl>
<p>
</p></div></div>
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