schema.elementFactories.exsd Maven / Gradle / Ivy
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This extension point is used to add element factories
to the workbench. An element factory is used to
recreate <samp>IAdaptable</samp> objects which are
persisted during workbench shutdown.
<p>
As an example, the element factory is used to
persist editor input. The input for an
editor must implement
<samp>org.eclipse.ui.EditorInput</samp>.
The life cycle of an <samp>IEditorInput</samp> within
an editor has a number of phases.
<ol>
<li>
The initial input for an editor is passed in during
editor creation.
</li>
<li>
On shutdown the workbench state is captured.
In this process the workbench will create a memento
for each open editor and its input. The input is
saved as a two part memento containing a factory ID
and any primitive data required to recreate the
element on startup. For more information see
the documentation on
<samp>org.eclipse.ui.IPersistableElement</samp>.
</li>
<li>
On startup the workbench state is read and the
editors from the previous session are recreated.
In this process the workbench will recreate the input
element for each open editor. To do this it will
map the original factory ID for the input element
to a concrete factory class defined in the registry.
If a mapping exists, and the factory class is valid,
an instance of the factory class is created. Then
the workbench asks the factory to recreate the original
element from the remaining primitive data within the
memento. The resulting <samp>IAdaptable</samp> is cast
to an <samp>IEditorInput</samp> and passed to the
new editor.
</li>
</ol>
a fully qualified identifier of the target extension point
an optional identifier of the extension instance
an optional name of the extension instance
a unique name that will be used to identify this factory.
a fully qualified name of a class that implements
<samp>org.eclipse.ui.IElementFactory</samp>
The following is an example of an element factory extension:
<p>
<pre>
<extension
point = "org.eclipse.ui.elementFactories">
<factory
id ="com.xyz.ElementFactory"
class="com.xyz.ElementFactory">
</factory>
</extension>
</pre>
</p>
The value of the <samp>class</samp> attribute must
be a fully qualified name of a class that implements
<samp>org.eclipse.ui.IElementFactory</samp>. An instance
of this class must create an <samp>IAdaptable</samp>
object from a workbench memento.
The workbench provides an <samp>IResource</samp> factory.
Additional factories should be added to recreate other
<samp>IAdaptable</samp> types commonly found in other
object models, such as the Java Model.
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