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<title>Akonadi.Attribute</title>
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KDE 4.9 PyKDE API Reference
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<h1>Attribute Class Reference</h1>
<code>from PyKDE4.akonadi import *</code>
<p>
Subclasses: <a href="../akonadi/Akonadi.CollectionQuotaAttribute.html">Akonadi.CollectionQuotaAttribute</a>, <a href="../akonadi/Akonadi.EntityDisplayAttribute.html">Akonadi.EntityDisplayAttribute</a>, <a href="../akonadi/Akonadi.EntityHiddenAttribute.html">Akonadi.EntityHiddenAttribute</a>, <a href="../akonadi/Akonadi.IndexPolicyAttribute.html">Akonadi.IndexPolicyAttribute</a>, <a href="../akonadi/Akonadi.AddressAttribute.html">Akonadi.AddressAttribute</a>, <a href="../akonadi/Akonadi.MessageFolderAttribute.html">Akonadi.MessageFolderAttribute</a>, <a href="../akonadi/Akonadi.MessageThreadingAttribute.html">Akonadi.MessageThreadingAttribute</a>, <a href="../akonadi/Akonadi.PersistentSearchAttribute.html">Akonadi.PersistentSearchAttribute</a>, <a href="../akonadi/Akonadi.EntityDeletedAttribute.html">Akonadi.EntityDeletedAttribute</a><br />
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>Provides interface for custom attributes for Entity.
</p>
<p>
This class is an interface for custom attributes, that can be stored
in an entity. Attributes should be meta data, e.g. ACLs, quotas etc.
that are not part of the entities' data itself.
</p>
<p>
Note that attributes are per user, i.e. when an attribute is added to
an entity, it only applies to the current user.
</p>
<p>
To provide custom attributes, you have to subclass from this interface
and reimplement the pure virtual methods.
</p>
<p>
<pre class="fragment">
class SecrecyAttribute : public Akonadi.Attribute
{
public:
enum Secrecy
{
Public,
Private,
Confidential
};
SecrecyAttribute( Secrecy secrecy = Public )
: mSecrecy( secrecy )
{
}
void setSecrecy( Secrecy secrecy )
{
mSecrecy = secrecy;
}
Secrecy secrecy() const
{
return mSecrecy;
}
virtual QByteArray type() const
{
return "secrecy";
}
virtual Attribute* clone() const
{
return new SecrecyAttribute( mSecrecy );
}
virtual QByteArray serialized() const
{
switch ( mSecrecy ) {
case Public: return "public"; break;
case Private: return "private"; break;
case Confidential: return "confidential"; break;
}
}
virtual void deserialize( const QByteArray &data )
{
if ( data == "public" )
mSecrecy = Public;
else if ( data == "private" )
mSecrecy = Private;
else if ( data == "confidential" )
mSecrecy = Confidential;
}
}
</pre>
</p>
<p>
Additionally, you need to register your attribute with Akonadi.AttributeFactory
for automatic deserialization during retrieving of collecitons or items:
</p>
<p>
<pre class="fragment">
AttributeFactory.registerAttribute<SecrecyAttribute>();
</pre>
</p>
<p>
Third party attributes need to be registered once by each application that uses
them. So the above snippet needs to be in the resource that adds the attribute,
and each application that uses the resource. This may be simplified in the future.
</p>
<p>
The custom attributes can be used in the following way:
</p>
<p>
<pre class="fragment">
Akonadi.Item item( "text/directory" );
SecrecyAttribute* attr = item.attribute<SecrecyAttribute>( Item.AddIfMissing );
attr->setSecrecy( SecrecyAttribute.Confidential );
</pre>
</p>
<p>
and
</p>
<p>
<pre class="fragment">
Akonadi.Item item = ...
if ( item.hasAttribute<SecrecyAttribute>() ) {
SecrecyAttribute *attr = item.attribute<SecrecyAttribute>();
SecrecyAttribute.Secrecy secrecy = attr->secrecy();
...
}
</pre>
</p>
<p>
<dl class="author" compact><dt><b>Author:</b></dt><dd> 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"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#deserialize">deserialize</a> (self, QByteArray data)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QByteArray </td><td class="memItemRight" valign="bottom"><a class="el" href="#serialized">serialized</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QByteArray </td><td class="memItemRight" valign="bottom"><a class="el" href="#type">type</a> (self)</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"> 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">QByteArray </td>
<td class="paramname"><em>data</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>Sets the data of this attribute, using the same encoding
as returned by toByteArray().
</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>data</em> </td><td> The encoded attribute data.
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="serialized"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">QByteArray serialized</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</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>Returns a QByteArray representation of the attribute which will be
storaged. This can be raw binary data, no encoding needs to be applied.
</p></div></div><a class="anchor" name="type"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">QByteArray type</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</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>Returns the type of the attribute.
</p></div></div>
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