drools-eclipse/org.guvnor.tools/src/org/guvnor/tools/Activator.java
public static ImageDescriptor getImageDescriptor(String id) {
        ImageDescriptor retVal = getDefault().getImageRegistry().getDescriptor(id);
        if (retVal == null) {
            retVal = loadImageDescriptor(id);
            getDefault().getImageRegistry().put(id, retVal);
        }
        return retVal;
    }
public static ImageDescriptor getImageDescriptor(String id) {
        ImageDescriptor retVal = getDefault().getImageRegistry().getDescriptor(id);
        if (retVal == null) {
            retVal = loadImageDescriptor(id);
            getDefault().getImageRegistry().put(id, retVal);
        }
        return retVal;
    }
Returns an image descriptor for the image file at the given
plug-in relative path

@param path the path
@return the image descriptor