* get the class resources from the IFolder
*/
IFolder folder = (IFolder)getFile().getParent();
try {
InterfaceContentDescriber icd = new InterfaceContentDescriber();
for (IResource file : folder.members()){
if (!file.getFileExtension().equalsIgnoreCase("cdf"))
continue;
if (icd.describe(((IFile)file).getContents(), null) != IContentDescriber.VALID)
continue;
ToolInterface inter = ToolInterface.fetch(file.getProject(), (IFile)file);
if (inter != null)
interfaces.add(inter);
}