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Creating a parameter controlled ViewerFilter for CommonNavigator [message #511895]

Wed, 03 February 2010 06:00

Eclipse User

I have created a nice working ViewerFilter for my CommonNavigator.

The problem is that my implementation is very specific because the filter uses a String to determine whether the resource should be filtered or not.

Example:

public boolean select(Viewer viewer, Object parentElement, Object element) {
String filter = "CAT";
...
}

Now I would like to make the exact same filter with DOG, HORSE and so on. It would violate the DRY principle to duplicate the implementation and change the hardcoded filter string.

I would rather like to specify the filter string as a parameter (filterExpression ???) in some extension point and look this up within the ViewerFilter.

Any solutions with code examples are greatly appreciated.

Re: Creating a parameter controlled ViewerFilter for CommonNavigator [message #511947 is a reply to message #511895]

Wed, 03 February 2010 08:58

Eclipse User

It seems to be almost impossible to do this without having to do a ton of work. So I guess I am better of violating the DRY principle - Grrrr!

The main problem being that the ViewerFilter instance is only known at runtime by the CommonFilterDescriptorManager.

This class binds the ViewerFilter instances to a CommonFilterDescriptor (contains the info from plugin.xml).

public class CommonFilterDescriptorManager {

	private static final CommonFilterDescriptorManager INSTANCE = new CommonFilterDescriptorManager();

	private static final CommonFilterDescriptor[] NO_FILTER_DESCRIPTORS = new CommonFilterDescriptor[0];

	private final Set filters = new HashSet();

However everything about this class is private.

What I need is a getViewerFilter(CommonFilterDescriptor) method - or an alternative way to this.

I already spent to much time on this - so I am off to duplicating my filter code.

[Updated on: Wed, 03 February 2010 08:59] by Moderator

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