Re: [platform-debug-dev] Launch Variables

["Darin Wright" <Darin_Wright@xxxxxxxxxx>]

The contributed variable/value is similar to the JDT classpath variable contribution for a JRE. A plug-in may want to contribute a "standard" variable such that all its clients benefit/share from a common setup. For example, a plug-in contributing a launcher for a web server may want to define a variable that points to the server installation. In this case, a default value may not be known (to supply in plug-in XML), but perhaps the plug-in can infer a default value when required by searching the file system for the installation. In this case, the "initializer" is used to provide an initial value for the variable by performing a search in the file system.

To provide flexibility I feel we should allow contributions to initialize their variables in either way (i.e. a default value attribute, or provide a delegate to do the work in code).

Darin

Jared Burns <jared-eclipse@xxxxxxxxx> Sent by: platform-debug-dev-admin@xxxxxxxxxxx 05/05/2003 04:56 PM Please respond to platform-debug-dev

To:        platform-debug-dev@xxxxxxxxxxx         cc:                 Subject:        Re: [platform-debug-dev] Launch Variables

On Friday 02 May 2003 03:02 pm, Darin Wright wrote:
<snip>
> The notion of variables will be defined in the debug platform. There will 
> be two types of variables:
> (1) Simple variables. A simple variable has an identifier and a value that 
> does not change (or at least does not change often). Such a variable could 
> be defined by a user in a preference page, or could be contributed by an 
> extension (i.e. plug-ins can contribute variables). A variable contributed 
> by an extension may define either a default value for the variable, or 
> provide an "initializer". An initializer is a delegate class that will be 
> instantiated by the debug plug-in, when required, to obtain the 
> initial/default value of the variable.

I understand the desire to have variables that provide simple key/value pairs, 
but I don't understand what it means to contribute a key/value pair via a 
plugin. Who would want to do this and what would it look like?

I think the root of my confusion is that I imagine the key/value pairs being 
defined in metadata (stored in local preferences) and the keys being 
referenced by project data (from launch configs). I'm not sure how static 
data - keys, initial values, and initializers defined in a plugin - fits into 
this picture.

- Jared
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