Package org.eclipse.ui.intro.universal

Class ExtensionFactory

java.lang.Object

org.eclipse.ui.intro.universal.ExtensionFactory

All Implemented Interfaces:

IExecutableExtension, IExecutableExtensionFactory

public class ExtensionFactory
extends Object
implements IExecutableExtensionFactory, IExecutableExtension

Factory for the intro's public extensions.

This allows the extensions to be made available for use by RCP applications without exposing their concrete implementation classes.

Currently supported plug-in extensions:

• welcomeCustomization - a preference page that allows user customization of the shared Welcome.

This class should be referenced in extensions but not subclassed or instantiated programmatically.

Since:

3.2

Restriction:

This class is not intended to be subclassed by clients.

Restriction:

This class is not intended to be instantiated by clients.

Constructor Summary

Constructors

Constructor	Description
ExtensionFactory()

Method Summary

Modifier and Type	Method	Description
Object	create()	Creates and returns a new instance.
void	setInitializationData(IConfigurationElement config, String propertyName, Object data)	This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ExtensionFactory

public ExtensionFactory()

Method Details

create

public Object create()
              throws CoreException

Description copied from interface: IExecutableExtensionFactory

Creates and returns a new instance.

Specified by:

create in interface IExecutableExtensionFactory

Throws:

CoreException - if an instance of the executable extension could not be created for any reason

setInitializationData

public void setInitializationData(IConfigurationElement config,
 String propertyName,
 Object data)
                           throws CoreException

Description copied from interface: IExecutableExtension

This method is called by the implementation of the method IConfigurationElement.createExecutableExtension on a newly constructed extension, passing it its relevant configuration information. Most executable extensions only make use of the first two call arguments.

Regular executable extensions specify their Java implementation class name as an attribute of the configuration element for the extension. For example

     <action run="com.example.BaseAction"/>
 

In the above example, this method would be called with a reference to the <action> element (first argument), and "run" as the name of the attribute that defined this executable extension (second argument).

The last parameter is for the specific use of extension adapters and is typically not used by regular executable extensions.

There are two supported ways of associating additional adapter-specific data with the configuration in a way that is transparent to the extension point implementor:

(1) by specifying adapter data as part of the implementation class attribute value. The Java class name can be followed by a ":" separator, followed by any adapter data in string form. For example, if the extension point specifies an attribute "run" to contain the name of the extension implementation, an adapter can be configured as

     <action run="com.example.ExternalAdapter:./cmds/util.exe -opt 3"/>
 

(2) by converting the attribute used to specify the executable extension to a child element of the original configuration element, and specifying the adapter data in the form of xml markup. Using this form, the example above would become

     <action>
         <run class="com.xyz.ExternalAdapter">
             <parameter name="exec" value="./cmds/util.exe"/>
             <parameter name="opt"  value="3"/>
         </run>
     </action>
 

Form (2) will typically only be used for extension points that anticipate the majority of extensions configured into it will in fact be in the form of adapters.

In either case, the specified adapter class is instantiated using its 0-argument public constructor. The adapter data is passed as the last argument of this method. The data argument is defined as Object. It can have the following values:

• null, if no adapter data was supplied
• in case (1), the initialization data string is passed as a String
• in case (2), the initialization data is passed as a Hashtable containing the actual parameter names and values (both Strings)

Specified by:

setInitializationData in interface IExecutableExtension

Parameters:

config - the configuration element used to trigger this execution. It can be queried by the executable extension for specific configuration properties

propertyName - the name of an attribute of the configuration element used on the createExecutableExtension(String) call. This argument can be used in the cases where a single configuration element is used to define multiple executable extensions.

data - adapter data in the form of a String, a Hashtable, or null.

Throws:

CoreException - if error(s) detected during initialization processing

See Also:

• IConfigurationElement.createExecutableExtension(String)