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Extension-point schema 'kind="indentifier" - what's its purpose? [message #631366]

Thu, 07 October 2010 05:42

Eclipse User

Hello

I think 'identifier' is a recent addition to the 'Type' property of an extension-point schema Atttribute. I first saw it used in the PerepectiveExtensions schema, where it is used (as 'targetId') to point to the Perspective being extended.

In the schema source it shows as:
<appinfo>
<meta.attribute kind="identifier" basedOn="xxxx"/>
appinfo>

It's similar in construct to the 'kind=java' property.

What I can't find is any guidance on how it is intended to be used. It looks potentially useful for RCP apps.

Can anyone help?

Regards, John

Re: Extension-point schema 'kind="indentifier" - what's its purpose? [message #631374 is a reply to message #631366]

Thu, 07 October 2010 06:28

Eclipse User

On 07/10/10 3:12 PM, John Ormerod wrote:
> I think 'identifier' is a recent addition to the 'Type' property of an
> extension-point schema Atttribute. I first saw it used in the
> PerepectiveExtensions schema, where it is used (as 'targetId') to point
> to the Perspective being extended.
> In the schema source it shows as:
> <appinfo>
> <meta.attribute kind="identifier" basedOn="xxxx"/>
> appinfo>

PDE creates the Browse... button & the associated selection dialog with
all the valid identifiers. The values are computed with the basedOn
attribute. For example, the 'category' attribute when you try to create
a view.

--
- Prakash
Platform UI Team, IBM

www.eclipse-tips.com

Re: Extension-point schema 'kind="indentifier" - what's its purpose? [message #631398 is a reply to message #631366]

Thu, 07 October 2010 08:34

Eclipse User

As Prakash mentions, it generates a browse button to an attribute in
another extension point. Its actual specification syntax is XPath like:
<extensionPoint/elements/attribute

Example, we use org.eclipse.ui.commands to define commands for the system.

If you are defining a handler for the command in
org.eclipse.ui.handlers, you need to use a commandId from
org.eclipse.ui.commands. You used to just cut and paste it, which led
to ID hell (there's a bug for that :-)

Now in o.e.ui.handlers, we specify that the commandId attribute is an
identifier that links to org.eclipse.ui.commands/command/@id, which
allows PDE to browse it.

PW

--
Paul Webster
http://wiki.eclipse.org/Platform_Command_Framework
http://wiki.eclipse.org/Command_Core_Expressions
http://wiki.eclipse.org/Platform_Expression_Framework
http://wiki.eclipse.org/Menu_Contributions
http://wiki.eclipse.org/Menus_Extension_Mapping
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse .platform.doc.isv/guide/workbench.htm

Re: Extension-point schema 'kind="indentifier" - what's its purpose? [message #632317 is a reply to message #631398]

Tue, 12 October 2010 10:39

Eclipse User

Paul, Prakash
Just wanted to say thanks very much for you prompt replies.

I get it now - at definition time it's provides a good aid to getting the correct id of another 'thing'.

Regards, Johnn

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